Physics Force and Interactions Quiz

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Questions and Answers

What is the SI unit of force?

  • Newton (correct)
  • Kilogram
  • Dyne
  • Pound

Which of the following best describes balanced forces?

  • They never act on an object simultaneously.
  • They can change the shape and size of a body. (correct)
  • They always change an object's speed.
  • They result in a net force that is greater than zero.

Which situation involves an unbalanced force?

  • A car moving at a constant speed.
  • Two people exerting equal forces in opposite directions.
  • A child pushing a swing with varying strength. (correct)
  • A stack of books on a table.

What is meant by the term 'resultant force'?

<p>The single force from multiple forces acting on an object. (B)</p> Signup and view all the answers

Which of the following actions can be classified as a pulling action?

<p>Flying a kite (D)</p> Signup and view all the answers

What effect can a push or pull have on a moving object?

<p>It can change the direction of motion. (A)</p> Signup and view all the answers

What happens when the resultant of all forces acting on a body is zero?

<p>The object remains at rest or continues in uniform motion. (A)</p> Signup and view all the answers

Which of the following is a characteristic of contact forces?

<p>They require physical contact between bodies. (C)</p> Signup and view all the answers

Which of the following is NOT a type of action categorized under force?

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

What indicates that two bodies are interacting to produce force?

<p>At least two bodies must be involved. (D)</p> Signup and view all the answers

What is an example of muscular force?

<p>A person lifting a box. (A)</p> Signup and view all the answers

What does frictional force do?

<p>It opposes the motion of one body over another. (B)</p> Signup and view all the answers

What is the relationship between kilogram force (kgf) and gram force (gf)?

<p>1 kgf equals 1000 gf. (D)</p> Signup and view all the answers

What type of force is exerted by a magnet?

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

Which of the following is a vector quantity?

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

What distinguishes non-contact forces from contact forces?

<p>Non-contact forces can act without physical contact. (D)</p> Signup and view all the answers

Which of the following is NOT a function of muscular force?

<p>A magnet attracting a metal. (D)</p> Signup and view all the answers

What is the resultant force when two boys pull a rope with 200 N each towards opposite directions?

<p>0 N (A)</p> Signup and view all the answers

If two persons push a heavy box with forces of 200 N and 150 N in the same direction, what is their resultant force?

<p>350 N (D)</p> Signup and view all the answers

What is the result of a ball moving across a surface slowing down?

<p>Frictional force acting against its motion. (A)</p> Signup and view all the answers

Which effect of force is demonstrated when a ball at rest starts moving after being kicked?

<p>Moves a stationary object. (A)</p> Signup and view all the answers

What happens to a moving bicycle when a force is applied from behind?

<p>Its speed increases. (D)</p> Signup and view all the answers

When two persons push a heavy box from opposite directions with forces of 400 N and 220 N, what is the resultant force?

<p>180 N (A)</p> Signup and view all the answers

What other unit is equivalent to the force used to lift a mass of 1 kg?

<p>1000 gf (B)</p> Signup and view all the answers

What role do wooden sleepers play in supporting railway lines?

<p>They distribute pressure over a larger area. (C)</p> Signup and view all the answers

How is the pressure exerted by a liquid calculated?

<p>Pressure = Force/Area (D)</p> Signup and view all the answers

What device is commonly used to measure pressure differences in a liquid?

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

What phenomenon is responsible for air pressure?

<p>Fast-moving molecules colliding with walls of their container. (D)</p> Signup and view all the answers

What is the weight of the atmosphere above the surface of the Earth?

<p>Approximately 4.5 x 10^18 kg (D)</p> Signup and view all the answers

Which device is specifically used for measuring air pressure?

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

What does the difference in heights 'h' in a manometer indicate?

<p>The pressure applied. (A)</p> Signup and view all the answers

What effect does atmospheric pressure have on objects on Earth?

<p>It exerts pressure from all sides. (B)</p> Signup and view all the answers

What determines whether the magnetic force between two magnets is attractive or repulsive?

<p>The poles facing each other (D)</p> Signup and view all the answers

Which of the following accurately describes gravitational force?

<p>It acts on objects regardless of their location (D)</p> Signup and view all the answers

Which statement about pressure is correct?

<p>Pressure increases with a decrease in area (C)</p> Signup and view all the answers

Why are broader tires used on the rear wheels of tractors?

<p>To minimize pressure on the soil (C)</p> Signup and view all the answers

How does a sharp knife cut more effectively than a blunt knife?

<p>It exerts greater pressure on a smaller area (A)</p> Signup and view all the answers

Which force is exerted by electrically charged objects on uncharged objects?

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

What property makes tools like needles effective for piercing?

<p>Their sharp edges that reduce contact area (A)</p> Signup and view all the answers

Which of the following forces can act over a distance without contact?

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

Flashcards

Force

A push or pull that can change the motion of an object. It has both magnitude and direction.

Kilogram Force (kgf)

A unit of force equal to the force required to lift a 1 kg mass vertically.

Gram Force (gf)

A unit of force equal to the force required to lift a 1 g mass vertically.

Adding Forces: Same Direction

Force acting in the same direction add up to create a larger force.

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Adding Forces: Opposite Directions

Forces acting in opposite directions cancel each other out.

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Force: Moves a Stationary Object

Force can cause a stationary object to move.

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Force: Stops a Moving Object

Force can bring a moving object to a stop.

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Force: Changes Speed of Moving Object

Force can change the speed of a moving object, either making it go faster or slower.

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Contact Force

A force that acts through direct contact between two objects.

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Muscular Force

A force exerted by muscles to create movement.

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Frictional Force

A force that opposes the motion of an object sliding on a surface.

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Non-Contact Force

A force that acts between objects without any physical contact.

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Magnetic Force

A force exerted by a magnet on objects made of iron, cobalt, and nickel.

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Gravitational Force

A force that attracts objects with mass towards each other.

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Resistance

The force that causes objects to slow down and stop.

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What is Force?

A push or pull that can change an object's motion, direction, or shape.

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Interaction Causes Force

Forces occur when two objects interact with each other. One object exerts a force on the other.

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Resultant Force

The combined effect of all forces acting on an object. It can be thought of as a single force that produces the same overall effect.

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Balanced Forces

Forces that balance each other out, resulting in no change in the object's motion.

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Unbalanced Forces

Forces that do not balance each other out, resulting in a change in the object's motion.

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Newton (N)

The standard unit of measurement for force.

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Magnitude of Force

The strength or magnitude of a force is measured in newtons.

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Dyne

The CGS unit of force, also called a dyne. It is frequently used in physics.

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Electrostatic Force

The force exerted by an electrically charged object on another object.

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Pressure

The force acting on an object perpendicular to its surface, per unit area.

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Tractor Tires

Tractors with wider tires distribute their weight over a larger area, reducing the pressure on the soil.

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Sharp Edges

Sharp tools concentrate force on a small area, increasing pressure for cutting or piercing.

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Backpack Straps

Wide straps on backpacks distribute the weight over a larger area, reducing pressure on the shoulders.

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Force and Area

The amount of force acting over a specific area is key to determining the effectiveness of cutting tools.

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Pressure Exerted by Liquids

The pressure exerted by liquids is due to the weight of the liquid pressing down on the base of the container.

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Manometer

A U-shaped glass tube filled with a liquid, used to measure differences in pressure at two points.

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Pressure Exerted by Gases

The force exerted by gases on the walls of their container due to the collisions of gas molecules.

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Atmospheric Pressure

The pressure exerted by the Earth's atmosphere due to its weight. It's the force per unit area exerted on the surface of the Earth.

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What do wooden sleepers do?

They distribute the weight of a train over a larger area, preventing the railway lines from sinking.

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How is pressure measured?

A simple device like a manometer or a barometer is used to measure the difference in pressure at two points.

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Why are railway lines supported?

They keep the railway lines from sinking into the ground due to the train's weight.

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Study Notes

Force and Interactions

  • Force is a vector quantity, meaning it has both magnitude and direction
  • Force arises from interactions between two bodies
  • Without interaction, no force exists
  • Forces can change the state of motion of a body (speed, direction, or shape)
  • The direction of a force is the direction in which the body is pushed or pulled

Types of Forces

  • Contact forces: Forces that involve physical contact between objects
    • Examples include muscular force and frictional force
  • Non-contact forces: Forces that act without physical contact
    • Examples include magnetic force, electrostatic force, and gravitational force

Effects of Force

  • Force can:
    • Move a stationary object
    • Stop a moving object
    • Change the speed of a moving object
    • Change the shape and size of an object

Units of Force

  • SI unit of force is the newton (N)
  • CGS unit of force is the dyne

Resultant Force

  • When multiple forces act on a body, the resultant force is the single force that produces the same effect on the body as all the forces combined
  • Balanced forces have a resultant force of zero
  • Unbalanced forces have a resultant force greater than zero

Pressure

  • pressure is the perpendicular force acting on a unit area of an object.
  • Pressure (P) = Force (F) / Area (A)

Pressure in Fluids

  • Liquids and gases exert pressure which increases with depth
  • The pressure exerted by a liquid is the same at a given depth, in all directions at that same depth
  • The pressure exerted by liquids is proportional to the height of the column of liquid and its density.

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