Physics Chapter on Forces and Motion

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Questions and Answers

What does inertia refer to?

  • The tendency of an object to resist any change in its state of motion (correct)
  • The measure of gravitational force on an object
  • The speed of an object moving in a straight line
  • The force acting on an object when it is in motion

An inertial frame of reference can be defined as one where objects experience nonzero acceleration.

False (B)

What is the relationship between mass and inertia?

Objects with larger mass have larger inertia.

An object will accelerate if there is a nonzero __________ acting on it.

<p>unbalanced force</p> Signup and view all the answers

Match the law of motion to its description:

<p>Newton's First Law = An object remains at rest or in uniform motion unless acted upon by a force Newton's Second Law = Acceleration is produced when a force acts on a mass Newton's Third Law = For every action, there is an equal and opposite reaction</p> Signup and view all the answers

Which of the following best describes force?

<p>A pull or push that can change an object's motion. (B)</p> Signup and view all the answers

Which of the following statements is true regarding weight?

<p>Weight can change based on gravitational force acting on an object. (A)</p> Signup and view all the answers

The only force acting on an object when held in hand is gravity.

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

A force can only be applied to a stationary object.

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

What is the vector nature of force, and why is it considered a vector quantity?

<p>Force is a vector quantity because it has both magnitude and direction.</p> Signup and view all the answers

What happens to an object when the upward force opposing gravity is removed?

<p>The object accelerates downward due to gravity.</p> Signup and view all the answers

The law of __________ states that an object in motion stays in motion unless acted upon by an unbalanced force.

<p>inertia</p> Signup and view all the answers

Match the following types of forces with their descriptions:

<p>Contact Forces = Forces that involve physical contact between objects Non-Contact Forces = Forces that act without physical contact Applied Force = A force that is applied directly on an object Gravitational Force = Attraction between an object and the Earth</p> Signup and view all the answers

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

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

Forces can only vary in magnitude and not in direction.

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

Name one type of contact force and provide its function.

<p>Frictional force, which resists the motion of two surfaces sliding against each other.</p> Signup and view all the answers

What is the relationship between force and acceleration, according to Newton's second law?

<p>Acceleration is directly proportional to force. (A)</p> Signup and view all the answers

The gravitational force acting on an object is directed away from the center of the earth.

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

What is the formula representing Newton's second law of motion?

<p>F = ma</p> Signup and view all the answers

The unit of force, measured in newtons, can be expressed as 1 N = ___ kg*m/s².

<p>1</p> Signup and view all the answers

What is the acceleration due to gravity on the surface of the earth?

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

According to Newton's third law, for every action, there is an equal and opposite reaction.

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

The weight of an object is represented by the letter ___ in the equation W = mg.

<p>W</p> Signup and view all the answers

Match the following forces with their definitions:

<p>Gravitational Force = Force acting towards the center of the earth Applied Force = Force exerted by a person or object Normal Force = Force exerted by a surface to support the weight of an object Frictional Force = Force opposing the relative motion of two surfaces in contact</p> Signup and view all the answers

Flashcards

Force

A push or pull that can change the state of motion of an object, or change its shape or size.

Unbalanced Force

Anything that causes an object to accelerate, which means to change its velocity (speed or direction).

Contact Forces

Forces that involve physical contact between objects, like pushing a door or pulling a wagon.

Non-Contact Forces

Forces that act upon objects without direct contact, like gravity pulling you down.

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Inertia

The tendency of an object to resist changes in its state of motion. An object at rest wants to stay at rest, and an object in motion wants to stay in motion.

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Newton's First Law of Motion (Law of Inertia)

An object at rest will stay at rest, and an object in motion will stay in motion at a constant speed and direction unless acted upon by an unbalanced force.

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Friction

The force that opposes the motion of one surface sliding over another.

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Normal Force

A force that acts perpendicular to a surface, like the force a table exerts on a book.

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Inertial Frame of Reference

A reference frame where an object at rest remains at rest and an object in motion continues in motion with constant velocity, unless acted upon by a force.

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Mass

A measure of an object's resistance to changes in its motion. The more massive an object, the harder it is to accelerate or decelerate.

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Weight

The force of gravity acting on an object. It can change depending on the gravitational field.

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Newton's First Law of Motion

Newton's First Law of Motion states that an object at rest remains at rest, and an object in motion continues in motion with constant velocity, unless acted upon by a force.

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Newton's Second Law of Motion

Newton's Second Law of Motion states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass.

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Net Force

The overall effect of all the forces acting on an object. It determines the object's acceleration.

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Gravitational Force

The force exerted on an object due to gravity. It is equal to the mass of the object multiplied by the acceleration due to gravity.

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Acceleration due to Gravity (g)

The acceleration due to gravity, a constant value of approximately 9.8 m/s² on Earth's surface, directed towards the Earth's center.

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Newton (N)

The standard unit of force in the International System of Units (SI).

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Newton's Third Law of Motion

For every action, there is an equal and opposite reaction. This means that when one object exerts a force on another object, the second object exerts an equal and opposite force back on the first object.

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