Gr 9 NATURAL SCIENCES: CH 3.1 SUM Forces
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Questions and Answers

What does the length of an arrow represent in a diagram?

  • The magnitude of the force (correct)
  • The surface it is acting on
  • The direction of the force
  • The type of force

What is the purpose of a spring balance?

  • To measure the magnitude of a force (correct)
  • To demonstrate Hooke's Law
  • To measure the direction of a force
  • To apply a force

What type of force is the force of gravity?

  • Frictional force
  • Normal force
  • Non-contact force (correct)
  • Contact force

What is the direction of the frictional force?

<p>Opposite to the direction of motion (B)</p> Signup and view all the answers

What is the relationship between friction and the normal force?

<p>Friction depends on the type of surface and the normal force (A)</p> Signup and view all the answers

What is the function of the normal force?

<p>To prevent an object from penetrating a surface (D)</p> Signup and view all the answers

What is an advantage of friction?

<p>It allows us to walk without slipping (C)</p> Signup and view all the answers

What is tension?

<p>A force that occurs when an object is being pulled by forces acting from opposite ends (B)</p> Signup and view all the answers

What is the net force calculated as in the example of pushing a go-cart?

<p>The difference between the forces pushing it forward and the frictional force (D)</p> Signup and view all the answers

What is the common characteristic of contact forces?

<p>They occur between objects that are physically touching each other (B)</p> Signup and view all the answers

What is a common characteristic among gravitational, magnetic, and electrostatic forces?

<p>They act over a distance without physical contact (B)</p> Signup and view all the answers

How do magnetic and electrostatic forces differ from gravitational force?

<p>They can be either attractive or repulsive (C)</p> Signup and view all the answers

What is a common method of visualizing field forces?

<p>Representing them with arrows (C)</p> Signup and view all the answers

Which force is responsible for keeping planets in orbit?

<p>Gravitational Force (C)</p> Signup and view all the answers

What is a real-world application of magnetic force?

<p>Compasses (B)</p> Signup and view all the answers

How is electrostatic force demonstrated?

<p>Through the behavior of charged objects (D)</p> Signup and view all the answers

What is a characteristic of electrostatic force?

<p>It can be either attractive or repulsive (D)</p> Signup and view all the answers

Which force is responsible for causing lightning?

<p>Electrostatic Force (A)</p> Signup and view all the answers

How are gravitational fields represented?

<p>With arrows pointing towards the center of the attracting mass (B)</p> Signup and view all the answers

What is a common aspect of magnetic and gravitational fields?

<p>They are both visually represented with field lines (A)</p> Signup and view all the answers

What is the unit of measurement for force?

<p>Newton (B)</p> Signup and view all the answers

What is the result of forces acting on an object in opposite directions and equal in size?

<p>The net force is zero (B)</p> Signup and view all the answers

What is the term for the rate at which an object's velocity changes over time?

<p>Acceleration (D)</p> Signup and view all the answers

What happens when one object exerts a force on another object?

<p>The second object exerts an equal and opposite force (B)</p> Signup and view all the answers

What is the purpose of representing forces using arrows?

<p>To visualize the direction and magnitude of forces (A)</p> Signup and view all the answers

What is the result of unbalanced forces acting on an object?

<p>The object moves in a particular direction (A)</p> Signup and view all the answers

What is the definition of a force?

<p>A push or pull on an object (B)</p> Signup and view all the answers

What happens when multiple forces act on an object?

<p>The net force is the combination of the individual forces (B)</p> Signup and view all the answers

What is the effect of forces on an object's motion?

<p>Forces can start or stop the motion of an object (D)</p> Signup and view all the answers

What is the term for the speed and direction of a moving object?

<p>Velocity (B)</p> Signup and view all the answers

What type of force occurs when an object is being squashed or deformed by forces acting towards each other?

<p>Compression (D)</p> Signup and view all the answers

What type of force is responsible for the attraction between objects with mass?

<p>Gravitational Force (A)</p> Signup and view all the answers

What is the formula to calculate weight?

<p>W = m × g (B)</p> Signup and view all the answers

What is the nature of magnetic forces?

<p>Like poles repel, and opposite poles attract (C)</p> Signup and view all the answers

What is the result of friction causing electrons to transfer between objects?

<p>One object becomes negatively charged and the other positively charged (C)</p> Signup and view all the answers

What type of force acts over a distance without direct physical contact between objects?

<p>Field Force (A)</p> Signup and view all the answers

What is an example of an object experiencing both compression and tension?

<p>A bridge (B)</p> Signup and view all the answers

What is the gravitational acceleration on Earth?

<p>9.8 m/s² (B)</p> Signup and view all the answers

What is the nature of electrostatic forces?

<p>Like charges repel, and opposite charges attract (D)</p> Signup and view all the answers

What type of materials are magnetic?

<p>Only certain materials like iron, nickel, and cobalt (C)</p> Signup and view all the answers

What is a common aspect of gravitational, magnetic, and electrostatic forces?

<p>They are non-contact forces (B)</p> Signup and view all the answers

What is the direction of electrostatic field lines?

<p>From positive to negative charges (D)</p> Signup and view all the answers

Which force is responsible for the behavior of charged objects?

<p>Electrostatic force (B)</p> Signup and view all the answers

What is a real-world application of electrostatic force?

<p>Photocopiers (C)</p> Signup and view all the answers

How are magnetic fields typically visualized?

<p>With iron filings or drawn from the north pole to the south pole (B)</p> Signup and view all the answers

What does the direction of an arrow in a force diagram represent?

<p>The direction of the force (D)</p> Signup and view all the answers

What is the purpose of Hooke's Law in measuring forces?

<p>To measure the distance a spring moves in proportion to the force applied (D)</p> Signup and view all the answers

What is a characteristic of magnetic force?

<p>It can be attractive or repulsive (C)</p> Signup and view all the answers

What is the characteristic of contact forces?

<p>They occur between objects that are physically touching each other (B)</p> Signup and view all the answers

How do gravitational and electrostatic forces differ?

<p>Gravitational force is always attractive, while electrostatic force can be attractive or repulsive (D)</p> Signup and view all the answers

What is the effect of friction on an object's motion?

<p>It decreases the object's speed (B)</p> Signup and view all the answers

Which force has a real-world application in keeping planets in orbit?

<p>Gravitational force (C)</p> Signup and view all the answers

What is a common method of representing field forces?

<p>Drawing diagrams with arrows (D)</p> Signup and view all the answers

What is the relationship between the normal force and the weight of an object?

<p>The normal force equals the weight but in the opposite direction (C)</p> Signup and view all the answers

Which force is responsible for causing lightning?

<p>Electrostatic force (D)</p> Signup and view all the answers

What is an example of a non-contact force?

<p>Gravitational force (C)</p> Signup and view all the answers

What is the purpose of a force diagram?

<p>To visualize the forces acting on an object (D)</p> Signup and view all the answers

What is the net force calculated as in the example of Jabu and Viantha pulling Rod's arms?

<p>10 N + (-6 N) = 4 N to the left (C)</p> Signup and view all the answers

What is the advantage of friction in vehicle safety?

<p>It prevents skidding of the vehicle (B)</p> Signup and view all the answers

What type of force occurs when an object is being pulled by forces acting from opposite ends?

<p>Tension force (D)</p> Signup and view all the answers

What is the force that occurs when an object is being stretched or deformed by forces acting away from each other?

<p>Tension (D)</p> Signup and view all the answers

What is the force that acts between any two objects with mass?

<p>Gravitational force (C)</p> Signup and view all the answers

What is the type of force that is responsible for keeping planets in orbit around the Sun?

<p>Gravitational force (A)</p> Signup and view all the answers

What is the formula to calculate weight?

<p>W = m × g (C)</p> Signup and view all the answers

What is the nature of magnetic forces?

<p>Like poles repel, and opposite poles attract (A)</p> Signup and view all the answers

What is the result of friction causing electrons to transfer between objects?

<p>One object becomes positively charged and the other negatively charged (C)</p> Signup and view all the answers

What is the type of force that acts over a distance without direct physical contact between objects?

<p>Non-contact force (C)</p> Signup and view all the answers

What is an example of an object experiencing both compression and tension?

<p>A bridge (A)</p> Signup and view all the answers

What is the gravitational acceleration on Earth?

<p>9.8 m/s² (B)</p> Signup and view all the answers

What is the nature of electrostatic forces?

<p>Like charges repel, and opposite charges attract (D)</p> Signup and view all the answers

What is the effect of forces on an object's shape?

<p>It changes the object's shape or deforms it (B)</p> Signup and view all the answers

When a force is applied to an object, what happens to the object's velocity?

<p>It changes over time, either increasing or decreasing (B)</p> Signup and view all the answers

What is the result of an object experiencing an equal and opposite force?

<p>It remains stationary (C)</p> Signup and view all the answers

What happens when multiple forces act on an object in different directions?

<p>The forces add up to a net force (A)</p> Signup and view all the answers

What is the term for the speed and direction of a moving object?

<p>Velocity (C)</p> Signup and view all the answers

What is the result of unbalanced forces acting on an object?

<p>The object accelerates in the direction of the net force (D)</p> Signup and view all the answers

What is the law that states that every action has an equal and opposite reaction?

<p>Newton's Third Law of Motion (B)</p> Signup and view all the answers

What is the purpose of representing forces using arrows?

<p>To show the direction of the force (C)</p> Signup and view all the answers

What occurs when the forces acting on an object are equal in size but opposite in direction?

<p>The object remains stationary (C)</p> Signup and view all the answers

What is the effect of a force on an object's motion?

<p>It can start or stop the motion, increase or decrease the speed, or change the direction (A)</p> Signup and view all the answers

What is the primary difference between compression and tension forces?

<p>Compression forces squash objects, while tension forces stretch objects. (A)</p> Signup and view all the answers

What determines the strength of gravitational force between two objects?

<p>The mass of one object and the distance between them (C)</p> Signup and view all the answers

What is the term for the force of attraction or repulsion between charged objects?

<p>Electrostatic force (D)</p> Signup and view all the answers

What happens to an object's velocity when a net force acts upon it?

<p>It increases or decreases (D)</p> Signup and view all the answers

What type of force is responsible for the attraction between magnets and certain metals?

<p>Magnetic force (B)</p> Signup and view all the answers

What is the force that opposes motion between two surfaces in contact?

<p>Frictional force (A)</p> Signup and view all the answers

What is the formula to calculate the weight of an object?

<p>W = m × g (C)</p> Signup and view all the answers

What is the primary difference between magnetic and electrostatic forces?

<p>Magnetic forces are always attractive, while electrostatic forces can be attractive or repulsive. (B)</p> Signup and view all the answers

What is the term for the forces that act over a distance without direct physical contact between objects?

<p>Non-contact forces (A)</p> Signup and view all the answers

What is a common application of magnetic force?

<p>Sorting recyclable materials (D)</p> Signup and view all the answers

What is the effect of a force on an object's shape?

<p>It changes the object's shape or deforms it (D)</p> Signup and view all the answers

What is a common characteristic of both gravitational and magnetic forces?

<p>They can be both attractive and repulsive. (A)</p> Signup and view all the answers

What happens when the net force acting on an object is zero?

<p>The object remains stationary (C)</p> Signup and view all the answers

What is the net force when two forces, 8 N and 3 N, act in the same direction on an object?

<p>11 N (B)</p> Signup and view all the answers

How do electrostatic and magnetic forces differ from each other?

<p>Electrostatic forces act between charged objects, while magnetic forces act between magnetic poles. (D)</p> Signup and view all the answers

Which of the following forces is responsible for the slowing down of a ball rolled on the ground?

<p>Frictional force (D)</p> Signup and view all the answers

What is the result of an object experiencing a force in the opposite direction of its motion?

<p>The object's velocity decreases (D)</p> Signup and view all the answers

What is a common method of visualizing gravitational fields?

<p>Representing the field with arrows pointing towards the center of the attracting mass. (C)</p> Signup and view all the answers

What is a characteristic of electrostatic forces?

<p>They can be either attractive or repulsive, depending on the charges involved. (A)</p> Signup and view all the answers

What is the force that prevents an object from penetrating the surface it is on?

<p>Normal force (C)</p> Signup and view all the answers

What is the relationship between the force applied to an object and its resulting acceleration?

<p>The force and acceleration are directly proportional (C)</p> Signup and view all the answers

What is a real-world application of magnetic forces?

<p>All of the above. (D)</p> Signup and view all the answers

What is the net force acting on an object when two forces of equal magnitude but opposite direction are applied?

<p>The net force is zero (B)</p> Signup and view all the answers

What is the direction of the force exerted by Viantha on Rod's arm, given that the force is 6 N to the right?

<p>To the right (B)</p> Signup and view all the answers

What is the purpose of Hooke's Law in measuring forces?

<p>To measure the force using a spring balance (B)</p> Signup and view all the answers

What is a characteristic of field forces?

<p>They can be represented by fields and field lines. (A)</p> Signup and view all the answers

What is the effect of a force on an object's motion when it is applied in the same direction as the motion?

<p>The object's velocity increases (C)</p> Signup and view all the answers

How do gravitational and electrostatic forces differ?

<p>Gravitational forces act between objects with mass, while electrostatic forces act between charged objects. (B)</p> Signup and view all the answers

Which of the following is an example of a non-contact force?

<p>Magnets exerting a force on each other (D)</p> Signup and view all the answers

What is the term for the force that opposes motion between two surfaces in contact?

<p>Frictional force (A)</p> Signup and view all the answers

What is the result of an object experiencing a force in the same direction as its motion?

<p>The object's acceleration increases (D)</p> Signup and view all the answers

What is the result of unbalanced forces acting on an object?

<p>The object will accelerate (B)</p> Signup and view all the answers

What is the nature of magnetic forces?

<p>They can be either attractive or repulsive, depending on the poles involved. (D)</p> Signup and view all the answers

Which of the following is a characteristic of contact forces?

<p>They occur between objects that are physically touching (C)</p> Signup and view all the answers

What is the effect of multiple forces acting on an object?

<p>The net force acting on the object determines its motion (B)</p> Signup and view all the answers

What is a common aspect of gravitational, magnetic, and electrostatic forces?

<p>They are all non-contact forces that act over a distance. (D)</p> Signup and view all the answers

What is the force that acts perpendicular to the surface on which an object rests?

<p>Normal force (D)</p> Signup and view all the answers

What is the characteristic of action and reaction forces?

<p>They are equal in size but opposite in direction (A)</p> Signup and view all the answers

Which force is responsible for the behavior of charged objects?

<p>Electrostatic force. (D)</p> Signup and view all the answers

What is the result of frictional force acting on an object?

<p>The object will decelerate (D)</p> Signup and view all the answers

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