Quiz 2.3 Relation between Force and Motion

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What unit is used to measure force?

kilograms (kg)

m/s2

m/s

Newtons (N)

What unit is used to measure force?

m/s

kilograms (kg)

Newtons (N)

m/s2

What unit is used to measure force?

m/s2

Newtons (N)

m/s

kilograms (kg)

What measurement is used to measure acceleration?

m/s2

m/s

kilograms (kg)

Newtons (N)

What measurement is used to measure mass?

Newtons (N)

m/s

m/s2

kilograms (kg)

What is inertia?

Resistance to changes in motion

A force that stops motion

The ability to move an object

The force of gravity

According to Newton’s Second Law, if you apply more force to an object, it will:

Move slower

Stop moving

Accelerate more

Stay the same speed

Newton’s Third Law states that for every action, there is:

A smaller reaction

An equal and opposite reaction

A larger reaction

No reaction

If two people push a box with forces of 30 N and 20 N in the same direction, the total force is:

20 N

50 N

30 N

10 N

What causes a parachute to slow down a skydiver?

Gravity

Magnetism

Inertia

Air resistance

A car accelerates faster when a stronger engine is used. This demonstrates:

Newton’s First Law

Newton’s Second Law

Newton’s Third Law

None of the above

Imagine a person riding a skateboard. They push off the ground with their foot. Which of Newton’s Laws is at work?

Newton’s First Law

Newton’s Second Law

Newton’s Third Law

None of the above

If you push a motionless bowling ball with a broom, it begins to move because:

Newton’s First Law states an object will stay at rest unless a force acts on it

Newton’s Second Law states that acceleration depends on force and mass

Newton’s Third Law states that for every action, there is an equal and opposite reaction

The ball has inertia

Two students play tug-of-war. One pulls with 50 N to the right, and the other with 40 N to the left. What is the net force, and which way does the rope move?

10 N to the right

90 N to the right

10 N to the left

90 N to the left

A student applies a force of 10 N to the right on a box, while another student applies a force of 7 N to the left. What is the net force, and in which direction will the box move?

3 N to the right

17 N to the left

3 N to the left

17 N to the right

Which of the following is the best example of an unbalanced force?

A book resting on a table

A car moving at a constant speed on a highway

A ball being kicked across a field

A person sitting on a chair

When a football is lying on the field, what forces are acting on it?

No forces, since it’s not moving

A balanced force between gravity and the normal force from the ground

Only friction

Gravity only

Two identical objects are placed in water, but one floats and the other sinks. What can be said about the forces acting on them?

Both objects experience balanced forces

Gravity is stronger on the sinking object

The floating object has balanced forces, while the sinking object has unbalanced forces

The floating object has unbalanced forces pushing it up

What happens to an object when all forces acting on it are balanced?

It moves in the direction of the largest force

 It stops moving

 It continues moving at a constant velocity or remains at rest

 It accelerates

How does Newton’s Second Law explain why a heavier object is harder to push than a lighter one?

A heavier object has more gravity, which cancels out any applied force.

A heavier object has more inertia, so it moves on its own without needing force.

A heavier object has more mass, so it needs more force to accelerate.

A heavier object experiences less friction, making it harder to push.

Why do you lurch forward when a bus suddenly stops? How does this relate to Newton’s First Law?

Your body resists the stop because objects in motion stay in motion unless acted upon by an unbalanced force.

The force of the bus stopping pulls you forward because objects always move in the direction of applied force.

Newton’s Third Law states that when the bus stops, it pushes you forward with equal force.

The bus exerts a forward force on your body, making you continue moving.

Why does a smaller car accelerate faster than a larger truck when the same force is applied?

Newton’s Third Law states that the car pushes back on the road with equal force, making it move faster than the truck.

Newton’s Second Law states that acceleration depends on mass and force, so the smaller car accelerates more because it has less mass.

Newton’s First Law states that objects at rest stay at rest, so the truck resists acceleration more than the car.

The truck experiences more friction, which prevents it from accelerating as much as the car.

What unit is used to measure force?

kilograms (kg)

m/s2

m/s

Newtons (N)

What unit is used to measure force?

m/s

kilograms (kg)

Newtons (N)

m/s2

What unit is used to measure force?

m/s2

Newtons (N)

m/s

kilograms (kg)

What measurement is used to measure acceleration?

m/s2

m/s

kilograms (kg)

Newtons (N)

What measurement is used to measure mass?

Newtons (N)

m/s

m/s2

kilograms (kg)

What is inertia?

Resistance to changes in motion

A force that stops motion

The ability to move an object

The force of gravity

According to Newton’s Second Law, if you apply more force to an object, it will:

Move slower

Stop moving

Accelerate more

Stay the same speed

Newton’s Third Law states that for every action, there is:

A smaller reaction

An equal and opposite reaction

A larger reaction

No reaction

If two people push a box with forces of 30 N and 20 N in the same direction, the total force is:

20 N

50 N

30 N

10 N

What causes a parachute to slow down a skydiver?

Gravity

Magnetism

Inertia

Air resistance

A car accelerates faster when a stronger engine is used. This demonstrates:

Newton’s First Law

Newton’s Second Law

Newton’s Third Law

None of the above

Imagine a person riding a skateboard. They push off the ground with their foot. Which of Newton’s Laws is at work?

Newton’s First Law

Newton’s Second Law

Newton’s Third Law

None of the above

If you push a motionless bowling ball with a broom, it begins to move because:

Newton’s First Law states an object will stay at rest unless a force acts on it

Newton’s Second Law states that acceleration depends on force and mass

Newton’s Third Law states that for every action, there is an equal and opposite reaction

The ball has inertia

Two students play tug-of-war. One pulls with 50 N to the right, and the other with 40 N to the left. What is the net force, and which way does the rope move?

10 N to the right

90 N to the right

10 N to the left

90 N to the left

A student applies a force of 10 N to the right on a box, while another student applies a force of 7 N to the left. What is the net force, and in which direction will the box move?

3 N to the right

17 N to the left

3 N to the left

17 N to the right

Which of the following is the best example of an unbalanced force?

A book resting on a table

A car moving at a constant speed on a highway

A ball being kicked across a field

A person sitting on a chair

When a football is lying on the field, what forces are acting on it?

No forces, since it’s not moving

A balanced force between gravity and the normal force from the ground

Only friction

Gravity only

Two identical objects are placed in water, but one floats and the other sinks. What can be said about the forces acting on them?

Both objects experience balanced forces

Gravity is stronger on the sinking object

The floating object has balanced forces, while the sinking object has unbalanced forces

The floating object has unbalanced forces pushing it up

What happens to an object when all forces acting on it are balanced?

It moves in the direction of the largest force

 It stops moving

 It continues moving at a constant velocity or remains at rest

 It accelerates

How does Newton’s Second Law explain why a heavier object is harder to push than a lighter one? 

A heavier object has more gravity, which cancels out any applied force.

A heavier object has more inertia, so it moves on its own without needing force.

A heavier object has more mass, so it needs more force to accelerate.

A heavier object experiences less friction, making it harder to push.

Why do you lurch forward when a bus suddenly stops? How does this relate to Newton’s First Law?

Your body resists the stop because objects in motion stay in motion unless acted upon by an unbalanced force.

The force of the bus stopping pulls you forward because objects always move in the direction of applied force.

Newton’s Third Law states that when the bus stops, it pushes you forward with equal force.

The bus exerts a forward force on your body, making you continue moving.

Why does a smaller car accelerate faster than a larger truck when the same force is applied?

Newton’s Third Law states that the car pushes back on the road with equal force, making it move faster than the truck.

Newton’s Second Law states that acceleration depends on mass and force, so the smaller car accelerates more because it has less mass.

Newton’s First Law states that objects at rest stay at rest, so the truck resists acceleration more than the car.

The truck experiences more friction, which prevents it from accelerating as much as the car.