Force, Motion, and Movie Sets

Multiple Choice

The picture of the position vs. time graph shows an object that is...

• accelerating/speeding up

• moving at a constant speed 

• not moving 

• accelerating/slowing down. 

Multiple Choice

Which graph represents zero acceleration (constant velocity)?

• A

• B

• C

• D

Multiple Choice

Which locations show constant speed?

• 1 and 4

• 2 and 5

• 3 and 6

Multiple Choice

Which locations show positive acceleration?

• 1 and 4

• 2 and 5

• 3 and 6

Multiple Choice

What is initial velocity (Vi ) for a non-moving ball pushed across the floor?

• same as its Vf

• can't be determined

• zero

• the distance travelled

Multiple Choice

Acceleration is defined as the CHANGE in 

• time it takes for one place to move to another place. 

• velocity of an object.

• distance divided by the time interval 

• velocity divided by the time interval 

Multiple Choice

Which of the following is a unit for acceleration?

• km/s

• m/s²

• mi/hr

• ft

Multiple Choice

Why does a car accelerate as it round a corner at a constant speed?

• Its direction changes

• It doesn't

• It slows down

• Its speeds up  

Multiple Choice

A box sliding down an inclined plane attains a velocity of 27 m/s in 3 seconds from rest.  Find the acceleration.

• 30 m/s

• 24 m/s²

• 9 m/s²

• 81 km/hr

Multiple Choice

A roller coasters accelerates from an initial velocity of of 6.0 m/s to a final velocity of 70 m/s over 4 seconds.  What's the acceleration?

• 24 m/s²

• 18 m/s²

• 16 m/s²

• 16 m/s

Multiple Choice

A dog runs with an initial speed of 7.5 m/s on a waxed floor.  It slides to a stop in 15 seconds.  What is the acceleration?

• -7.5 m/s

• -7.5 m/s²

• -0.5 m/s²

• 7.5 mi//hr

Multiple Choice

How can acceleration be zero?

• a car runs out of gas and slowly rolls to a stop

• a car decreases speed at a constant rate until it comes to rest

• car has constant speed and is traveling on a straight path

• the car travels round trip and is back at the starting point

Multiple Choice

Calculate the net force.

• 0 N

• 5 N

• 25 N

• 15 N

Multiple Choice

If a force causes an object to move, it's considered a(n) __________________ force.

• Balanced

• Unbalanced

• Massive

• Strong

Multiple Choice

If a 10 kilogram object accelerates suddenly at 15 m/s^2, how much force was applied to the object?

• 150 Newtons

• 15 Newtons

• 150 kilograms

• 100 kilograms

Multiple Choice

If a force of 50 Newton's was applied to an object with a mass of 500 grams, what will the object's acceleration be?

• 10 m/s^2

• .1 m/s^2

• 100 m/s^2

• 1 m/s^2

Multiple Choice

If an object is pushed with a force of 20N and moves with an acceleration of 2.0 m/s^2, what is the object's mass?

• 10 kg

• 40 kg

• 20 kg

• 0.1 kg

Multiple Choice

If an object with a mass of 30 kg is moving with an acceleration of 4 m/s^2 what was the force used to push the object.

• 7.5 N

• 0.13 N

• 120 N

• 34 N

Multiple Choice

What is Newton's First Law

• F=ma

• Every action has an equal and opposite reaction

• An object at rest stays at rest, an object in motion stays in motion. 

• Friction 

Multiple Choice

What kind(s) of objects have inertia?

• all objects with mass

• only objects at rest

• only objects in motion

• only objects whose motion is being changed

Multiple Choice

friction is a force that acts 

• in the same direction as the motion

• opposite to the direction of the motion

• opposite to the applied forces

• the same direction as the applied force

Multiple Choice

What is the unit for force?

• Newton

• Grams

• m/s^2

• Push

Multiple Choice

What is the unit for acceleration?

• m/s^2

• m/s

• Newtons

• grams

Multiple Choice

What kind of force is gravity?

• pushing force

• spinning force

• attractive force

Multiple Choice

Newton's Third Law States...

• Objects in motion stay in motion and objects at rest stay at rest

• Force is equal to mass times acceleration

• For each action there is an equal and opposite reaction

Multiple Choice

According to Newton's Third law the strength or magnitude of forces will be...

• smaller

• equal

• larger

Multiple Choice

According to Newton's third law forces come in pairs?

• True

• False

Multiple Choice

Whenever an object exerts a force on another object, the second object exerts a force of the same magnitude, but in the opposite direction to that of the first object.

• Always true

• Sometimes true

• Never true

Multiple Choice

A player throws a ball. The action force is the player impact on the ball. The reaction force is...

• The force of the ball impact on the player

• The force of the grip of the ball

• The celebration the player is thinking of

Multiple Choice

A rocket is able to accelerate in the vacuum of space when it fires its engines. The force that propels the rocket is the force

• of the rocket on the exhaust gases.

• of the exhaust gases on the rocket.

• neither A nor B

Multiple Choice

Earth pulls on the moon, and similarly the moon pulls on Earth. This is evidence that the

• Earth and moon are simply pulling on each other.

• Earth's and moon's pulls comprise an action-reaction pair.

• both a and b

• neither a or b

Multiple Choice

Newton's Third Law is also known as...

• The Law of Inertia

• The Law of Acceleration

• The Law of Conservation of Momentum (Force Pairs)

Multiple Choice

A large truck and a small car traveling at the same speed have a head-on collision. The vehicle to undergo the greater change in velocity will be

• the small car

• the large truck

• neither, both are the same.

Multiple Choice

Which of the following is the unit for centripetal force?

• J

• m/s²

• kg⋅m/s

• N

Multiple Choice

Which of the following units is used for tangential velocity?

• m/s²

• N

• J

• m/s

Multiple Choice

What is the relationship between centripetal force and the mass of an object?

• direct

• inverse

• exponential

• inverse squared

Multiple Choice

What relationship exists between the radius of a circle and the centripetal acceleration?

• direct

• inverse

• exponential

• inverse squared

Multiple Choice

Which represents the acceleration of the ball?

• A

• B

• C

• D

Multiple Choice

A horse gallops around a circular arena.  The centripetal force on the horse is ___.

• directed outward

• tension

• directed toward the center of the arena

• 9.8 N

Multiple Choice

A car with mass m travels around a curve with velocity v. What do you know about the centripetal force if the radius triples?

• 9.8?

• Force triples

• Force divides by 3

• Force divides by 9