Unit 6 review - Forces in Motion

Unit 6 Review
Forces and motion

By Stacy Mitchell

Multiple Choice

A person pushes against a wall with 15N of force. The wall doesn't move. The wall exerts how much force on the student?

• 15N

• greater than 15N

• less than 15N

• 0N

Multiple Choice

Which statement about the acceleration of an object is correct?

• The acceleration of an object is directly proportional to the net external force acting on the object and

  inversely proportional to the mass of the object

• The acceleration of an object is inversely proportional to the net external force acting on the object and

  directly proportional to the mass of the object.

Multiple Choice

Inertia is defined as

• an object's resistance to flow

• An object’s ability to be pulled into a wire

• an object's resistance to motion

• An object’s mass divided by its volume

Match

Match the following

• distance traveled by an object in a given amount of time

• a measurement of an object's speed and direction

• change in an object’s motion; caused by unbalanced forces

Speed

Velocity

Acceleration

• Speed

• Velocity

• Acceleration

Multiple Choice

You push on a car and it does not move.  What is true about the inertia?

• The inertia is changing
• The inertia of the car is too great 
• The inertia of the person is equal to the car
• There is not inertia because of no movement

Multiple Choice

Sometimes tectonic plates do not move easily past one another, and the plates become stuck. Forces build up, and when the plates finally move, tension is released, as shown below.

The sudden movement of the plates is caused by —

• The mass of the plates

• The weight of the plates

• unbalanced forces

• gravitational forces

Multiple Choice

m/s² is the unit for.....

• Mass

• Force

• Acceleration

• weight

Match

Match the following

• $$\frac{m}{s}$$  

• $$\frac{m}{s}\&Direction$$  

• $$\frac{m}{s^2}$$  

Speed

Velocity

Acceleration

• Speed

• Velocity

• Acceleration

Multiple Choice

What Unit do we Measure Force in? 

• Newtons
• Joules
• Force
• Don't know

Multiple Choice

An object in motion will stay in motion unless acted upon by an outside force is known as

• Newton's 1st Law

• Newton's 2nd Law

• Newton's 3rd Law

• Newton's Universal Law of Gravitation

Multiple Choice

what is the correct formula for force?

• F=ma

• $$F=\frac{m}{a}$$

• $$F=\frac{a}{m}$$

• $$F=a\times v$$

Match

Match the following

• Law of inertia

• Law of force and acceleration

• Law of action-reaction

Newton's 1st Law of Motion

Newton's 2nd Law of Motion

Newton's 3rd Law of Motion

• Newton's 1st Law of Motion

• Newton's 2nd Law of Motion

• Newton's 3rd Law of Motion

Multiple Choice

F= mass * acceleration

A 20 kg bike accelerates at 10 m/s². what is the force acting upon it?

• 25 Newtons

• 20 Newtons

• 200 Newtons

• 10 Newtons

Multiple Choice

A leaf falls from a tree and lands on the sidewalk. Identify an action-reaction pair in this situation.

• The tree exerts a force on the leaf; the sidewalk exerts a force on the leaf.

• The leaf exerts a force on the sidewalk; the tree exerts a force on the leaf.

• The leaf exerts a force on the sidewalk; the sidewalk exerts a force on the leaf.

Multiple Choice

How much force is needed to accelerate a 2 kg physics book to an acceleration of 6 m/s/s?

• 36 N
• 12 N
• 3 N
• 0.33 N

Match

Match the following

• the tendency of an object to resist change in motion unless acted upon by a force

• when an object that has a constant mass is acted upon by a force, the object will accelerate in the same direction as the force applied

• for every action, there is an equal and opposite reaction

Newton's 1st Law of Motion

Newton's 2nd Law of Motion

Newton's 3rd Law of Motion

• Newton's 1st Law of Motion

• Newton's 2nd Law of Motion

• Newton's 3rd Law of Motion

Multiple Choice

Which of the following is NOT an example of unbalanced forces?

• a turning car

• a car breaking to a stop

• a car traveling 60 mph constantly

• a car accelerating down a hill

Multiple Choice

If the only force acting on an object is gravity, the object is said to

• have balanced forces

• be an apple

• have reached terminal velocity

• be in free fall

Multiple Choice

Which of the following is NOT an example of balanced forces?

• a runner moving at a constant speed of 4 m/s

• a runner waiting at the starting line of a race

• a runner slowing down to a stop at the finish line

• a runner jogging in a straight line

Multiple Choice

$$F=m\times a$$  

• Newton's 1st Law of Motion

• Newton's 2nd Law of Motion

• Newton's 3rd Law of Motion

Multiple Choice

Balanced forces CANNOT result in which of the following?

• no changes in motion

• changes in direction

• constant speed

• no motion

Multiple Choice

What is the force exerted when an object has a mass of 3 kg and the acceleration of 9 m/s²?

• 27N

• 3N

• .33N

• 0N

Multiple Choice

What occurs if you increase the Net Force of an accelerating object?

• the object decreases speed

• the object increases speed

• the object's speed in unchanged

• the object moves at a constant speed

Match

Match the following

• the tendency of an object to resist change in motion unless acted upon by a force

• when an object that has a constant mass is acted upon by a force, the object will accelerate in the same direction as the force applied

• for every action, there is an equal and opposite reaction

Law of inertia

Law of force and acceleration

Law of action-reaction

• Law of inertia

• Law of force and acceleration

• Law of action-reaction

Multiple Choice

What occurs if you increase the Net Force of an accelerating object?

• the object decreases speed

• the object increases speed

• the object's speed in unchanged

• the object moves at a constant speed

Multiple Choice

Terminal speed occurs when:

• The air resistance of an object increases

• An object starts to slow down due to air resistance

• The force of gravity is equal to the air resistance of an object

• A parachute opens

Multiple Choice

Which of the following is NOT an example of acceleration?

• changing from 20 mph to 50 mph

• running 3 m/s to the left, then 3 m/s to the right

• driving 40 mph east

• turning at a rate of 10 m/s

Multiple Choice

$$F=m\times a$$  

• Law of inertia

• Law of force and acceleration

• Law of action-reaction

Multiple Choice

Which of the following is NOT an example of a velocity?

• 3 m/s upward

• 5 m/s² to the north

• 2 m/s to the south

• 10 mph towards the starting line

Multiple Choice

Which type of friction takes more force to overcome?

• kinetic

• static

• sliding

• all

Multiple Choice

Which of the following correctly describes the motion?

• an object at rest

• an object at constant speed

• an object accelerating

• an object with changing velocity

Multiple Choice

The diagram shows a barge moving north at 5 m/s while the current in the river is moving south at 1.34 m/s. When the barge enters the northern most part of the river, the southward current is 0.67 m/s.

How will the barge be affected?

• The barge will move slower.

• The barge will move faster.

• The barge will come to a stop.

• The direction of the barge will change.

Multiple Choice

What is the average speed of the object in this graph?

• 20 m/s

• 8 m/s

• 2.5 m/s

• 0.4 m/s

Multiple Choice

Friction is a force that

• does not exist when surfaces are very smooth

• opposes motion

• decreases with larger mass

• is constant everywhere on Earth

Multiple Choice

If the same force is applied, which car will accelerate more quickly?

• a car with a smaller mass

• a car with a bigger mass

Multiple Choice

One of the laws of motion states, "An object in motion stays in motion unless an unbalanced force acts upon it." On Earth, objects always seem to eventually come to a stop when more force is not being applied.

What force is causing the objects to eventually stop moving?

• Mass

• Friction

• Weight

• Gravity

Multiple Choice

What acceleration results from 25N of force being applied to a 5kg ball?

• 125 m/s²

• 0.2 m/s²

• 20 m/s²

• 5 m/s²

Multiple Choice

Read the questions to the right and choose the best answer.

• A

• B

• C

• D

Multiple Choice

A 0.5 kg football experiences a 16 m/s² acceleration when thrown. What force was applied on the football?

• 32 N

• 8 N

• 15.5 N

• 0.04 N

Multiple Choice

A 2000 kg truck and a 500 kg car are racing. The same amount of force is applied to each of them.

Which statement below best describes the acceleration of the vehicles?

• The truck will accelerate twice as fast.

• The car will accelerate four times as fast.

• The car will accelerate twice as fast.

• The truck will accelerate four times as fast.

Multiple Choice

If 2N of force accelerates a toy car 0.5 m/s², how much force is required to accelerate the toy car 1.2 m/s²

• 4.8N

• 0.8N

• 4N

• 5.2N

Multiple Choice

If the net force on an object is not equal to zero, the object:

• is at rest

• is moving at a constant velocity

• is accelerating

• is at terminal velocity

Multiple Choice

Which energy transformation is shown in this picture?

• chemical -----> light

• light -----> mechanical

• mechanical -----> chemical

• chemical -----> mechanical

Multiple Choice

If a car is moving on a road at 70 km/hr going due north and then changes direction and starts traveling north-east staying at 70 km/hr, what happens to its speed and velocity?

• The speed of the car changes, but the velocity stays the same.

• Both the speed and velocity of the car change.

• Neither the speed nor the velocity of the car changes.

• The velocity of the car changes, but the speed stays the same.speed velocity

Multiple Choice

The magnitude (size/amount) of gravitational force acting on an object is

• inertia

• mass

• friction

• weight

Multiple Choice

A car travels at a constant speed of 70 km/hr for 15 minutes. The car decreases its speed from 70 to 40 km/hr over the next two minutes and then continues to travel at a constant speed of 40 km/hr for the next 5 minutes.

Which of the following graphs best represents the car's motion during the given time period?

Multiple Choice

Which of the objects below will fall at the fastest rate when dropped? Assume there is no air resistance.

• 25 kg rock

• 75 kg rock

• 50 kg rock

• They all fall at the same rate

Multiple Choice

Which of the following would be found in the part labeled X in the above chart?

• Shows the slowing down of an object in motion

• Shows the speeding up of an object in motion

• Shows a change in the direction of an object in motion

• Shows the direction in which an object is traveling

Multiple Choice

What would cause the person on the right to change position?

• The force applied by the two people on the right would have to be greater than 200N.

• the force applied by the two people on the right would have to be less than 200 N.

• The person on the left would need to turn around

• It is impossible

Multiple Choice

An investigation was conducted to determine how the motion of an object is affected by unbalanced forces. The data collected is listed in the table below.

 

Which of the following remained the same throughout the investigation?

• The acceleration of the ball

• The velocity of the ball

• The speed of the ball

• The velocity, speed, and acceleration all remained the same.

Multiple Choice

If an object moves with a constant velocity, we can conclude that

• the net force on the object is zero

• the forces are balanced

• the object has reached terminal velocity

• all statements are true

Multiple Choice

Observe the illustration above. If the student fell off of the skateboard in the direction indicated, which arrow indicates the most likely direction the skateboard would travel based on the law of action-reaction?

• 1

• 2

• 3

• 4

Multiple Choice

What causes a moving object to change direction?

• acceleration

• velocity

• an unbalanced force

• inertia

Multiple Choice

A group of four students is participating in a marble race. Each marble has a different mass, and the same force is applied to each marble.

Which marble will experience the least acceleration?

• Marble A

• Marble B

• Marble C

• Marble D

Multiple Choice

The net force on this object is

• 3 N right

• 3 N left

• 9 N right

• 9 N left

Multiple Choice

According to the information and diagram above, how much acceleration is affecting the 2 kg mass?

• 9.9 N

• 19.8 m/s²

• 4.95 m/s²

• 19.8 N

Multiple Choice

None of the players in this game of tug-o-war changes position. Is work being done?

• Yes

• No

Multiple Choice

The diagram below shows the different forces acting on a toy rocket.

The total mass of the rocket is 0.5 kg. Based on the information above, what is the acceleration of the rocket?

• 6 m/s²

• 30 m/s²

• 14 m/s²

• 46 m/s²

Multiple Choice

According to Newton's __________ law of motion, an object with less mass will experience a greater acceleration if a constant force is applied to the object.

• 1st

• 2nd

• 3rd

• 4th

Multiple Choice

Which are simultaneous equal but opposite forces resulting from the interaction of two objects?

• action-reaction pairs

• field forces

• gravitational forces

• net external forces

Multiple Choice

You try to move a couch across the floor but it doesn't move. What is the other force acting on the couch?

• rolling friction

• sliding friction

• kinetic friction

• static friction

Multiple Choice

In what direction with the box move?

• right

• left

• up

• down

Multiple Choice

What is the net force on the object?

• 9 N right

• 9 N left

• 5 N right

• 5 N left

Multiple Choice

According to Newton’s second law, when the same force is applied to two objects of different masses,

• the object with greater mass will experience a great acceleration, and the object with less

  mass will experience an even greater acceleration.

• the object with greater mass will experience a smaller acceleration, and the object with less mass will

  experience a greater acceleration.

• the object with greater mass will experience a small acceleration, and the object with less mass will experience even smaller acceleration

Multiple Choice

Which is not a form of kinetic friction?

• static friction

• rolling friction

• sliding friction

• fluid friction

Multiple Choice

What is the net force acting on the box?

• 5N

• 25N

• 15N

• 0N

Multiple Choice

An object is in free fall. Assume no air resistance. What is its velocity after 2 seconds?

• 9.8 m/s/s down

• 9/8 m/s down

• 19.6 m/s/s down

• 19.6 m/s down

Multiple Choice

A ball is dropped from a person’s hand and falls to Earth. Identify an action-reaction pair in this situation.

• Earth exerts a force on the hand; the hand exerts a force on the ball.

• .

  Earth exerts a force on the ball; the ball exerts a force on Earth.

• Earth exerts a force on the ball; the hand exerts a force on Earth.

Multiple Choice

A frictional force caused by air. For objects in free fall it is an upward force.

• air resistance

• wind

• spoiler

• gravity

Multiple Choice

In a game of tug-of-war, there is a force pulling to right with 70N and a force pulling to the left with 68N. What will be the resulting motion?

• to the right

• to the left

• no motion

• everyone will move in the direction they are pulling

Multiple Choice

What is true about the rate of acceleration caused by gravity?

• It is = 9.8 m/s/s

• It is noted as g.

• It is constant all over Earth.

• All statements are true.

Multiple Choice

Which of the following statements does not describe force?

• Force causes objects to start moving.

• Force causes objects to change direction.

• Force causes objects to stop moving.

• Force causes objects at rest to remain stationary.

Multiple Choice

Mass

• is the amount of matter in an object

• is the force from gravity on an object

• would have different values on different planets

• is measured in Newtons

Multiple Choice

There is a book sitting at rest on a chair. Which of the following is true?

• There are many forces acting on the book, but they balance each other out

• The book exerts no force on the chair

• The chair exerts no force on the book

• all of these

Multiple Choice

Weight

• is the amount of matter in an object

• is the force from gravity on an object

• would have the same value on different planets

• is measured in kg

Multiple Choice

The statement by Newton that for every action there is an equal but opposite reaction is which of his laws of

motion?

• second

• first

• fourth

• third

Multiple Choice

A boulder in the park has a mass of 10 kg. What is the weight of the boulder?

• 10 kg

• 9.8 N

• 98 N

• 10 N

Multiple Choice

The wagon is slowing down due to friction.

• balanced forces

• unbalanced forces

Multiple Choice

A newton is equivalent to which of the following quantities?

• Kg·(m/s)^2

• Kg

• Kg·m/s^2

• Kg·m/s

Multiple Choice

The rollerblades are resting on the curb.

• balanced forces

• unbalanced forces

Multiple Choice

Which of the following forces arises from direct physical contact between two objects?

• contact force

• fundamental force

• gravitational force

• field force

Multiple Choice

The bike is in the bike rack.

• balanced force

• unbalanced force

Multiple Choice

A car goes forward along a level road at constant velocity. The additional force needed to bring the car into

equilibrium is

• greater than normal force

• normal force x kinetic friction

• equal to normal force x static friction

• zero

Multiple Choice

The ball is rolling down the hill.

• balanced forces

• unbalanced forces

Multiple Choice

What direction does the frictional force act?

• depends on the direction of the air resistance

• the opposite direction of motion

• depends on the gravitational force

• the same direction of motion

Multiple Choice

Three people can move a piano easier than two people. This demonstrates which of Newton's Laws of Motion?

• Newton's 1st Law (Inertia)

• Newton's 2nd Law (F= m x a)

• Newton's 3rd Law (Action Forces & Reaction Forces)

Multiple Choice

A hammer drives a nail into a piece of wood. Identify an action-reaction pair in this situation.

• The nail exerts a force on the hammer; the hammer exerts a force on the wood.

• The hammer exerts a force on the nail; the nail exerts a force on the hammer.

• The hammer exerts a force on the nail; the hammer exerts a force on the wood.

• The hammer exerts a force on the nail; the wood exerts a force on the nail.

Multiple Choice

What is the speed of an object in a given direction?

• force

• speed

• motion

• velocity

Multiple Choice

Which of the following is the tendency of an object to maintain its state of motion?

• force

• acceleration

• velocity

• inertia

Multiple Choice

A pebble is easier to move than a boulder is an example of which of Newton's Laws of Motion?

• Inertia

• F=ma

• Action forces and reaction forces

Multiple Choice

If a nonzero net force is acting on an object, then the object is definitely

• at constant velocity

• being accelerated

• losing mass

• at rest

Multiple Choice

This picture illustrates which of Newton's Laws of Motion?

• Inertia

• F=ma

• Action forces and reaction forces

Multiple Choice

A net force of 6.8 N accelerates a 31 kg scooter across a level parking lot. What is the magnitude of the scooter’s

acceleration? ( acceleration = mass/force)

• 0.69 m/s

• 0.22 m/s

• 0.22 m/s^2

• 3.2 m/s^2

Multiple Choice

This picture demonstrates which of Newton's three Laws of Motion?

• intertia

• F=ma

• Action forces and reaction forces

Multiple Choice

In a game of tug-of-war, a rope is pulled by a force of 182 N to the right and by a force of 108 N to the left. What is

the magnitude and direction of the net horizontal force on the rope?

• 290 N, left

• 290 N, right

• 74 N, left

• 74 N, right

Multiple Choice

What letter represents an object moving toward the point of reference?

• A

• B

• C

• D

Multiple Choice

Which of the following is the cause of an acceleration?

• velocity

• speed

• force

• inertia

Multiple Choice

What letter represents an object that is moving away from the point of reference for .2 hours?

• A

• B

• C

• D

Multiple Choice

As an object falls toward Earth,

• the upward acceleration of Earth is negligible because of its large mass.

• .

  Newton’s third law does not apply.

Multiple Choice

What letter represents when the object is not moving?

• A

• B

• C

• D

Multiple Choice

A hockey stick hits a puck on the ice. Identify an action-reaction pair in this situation.

• The stick exerts a force on the ice; the ice exerts a force on the puck.

• The stick exerts a force on the puck; the puck exerts a force on the ice.

• The stick exerts a force on the puck; the puck exerts a force on the stick.

Multiple Choice

A runner ran 24 miles in about 4 hours. What is the average speed of the runner?

• 96 mph

• 16 mph

• 6 mph

• 3 mph

Match

Match the following

• acceleration

• velocity

• inertia

rate of change of velocity

speed + direction

tendency of an object to stay in motion

• rate of change of velocity

• speed + direction

• tendency of an object to stay in motion

Multiple Choice

The free-body diagram shown above represents a car being pulled by a towing cable. In the diagram, the 5800 N

force is

• the force exerted by the towing cable on the car.

• the upward force the road exerts on the car.

Multiple Choice

In the free-body diagram shown above, which of the following is the gravitational force acting on the balloon?

• 950 N

• 1520 N

• 4050 N

• 5120 N

Multiple Choice

Newton’s third law of motion involves the interactions of

• 2 objects , 2 forces

• 2 objects, 1 force

• 1 object, 2 forces