Quiz about Forces, Motion, and Fields Unit 1 2022/23

Question 1

Which of the following is an action exerted on an object that may change the object's state of rest or motion?

Accepted Answer

force

Answer

mass

Answer

velocity

Answer

acceleration

Question 2

Which of these forces is being applied by the boy shown here?

Accepted Answer

contact force

Answer

gravitational force

Answer

fundamental force

Answer

field force

Question 3

A metal ball sits motionless on a flat surface. Which of these would make the ball move?

Accepted Answer

Two unequal horizontal opposing forces act upon the ball.

Answer

The force of gravity becomes less.

Answer

The force of gravity becomes greater.

Answer

Two equal horizontal opposing forces act upon the ball.

Question 4

A skydiver jumps out of a plane. She falls downward at a very fast speed. When she opens her parachute, she slows down. What force pulled the skydiver to the ground?

Accepted Answer

gravity

Answer

friction

Answer

air resistance

Answer

parachute pull

Question 5

A force can be a push or a pull.

Accepted Answer

true

Answer

false

Question 6

What is the SI unit for force?

Accepted Answer

newton

Answer

gram

Answer

pound

Question 7

Forces can change both direction and speed of an object.

Accepted Answer

true

Answer

false

Question 8

When a skater pushed off of a wall with her hand. The forces on the skater become balanced.

Accepted Answer

false

Answer

true

Question 9

In a force diagram, the point of the arrow represents the direction of the force.

Accepted Answer

true

Answer

false

Question 10

A fisherman steps off of a boat, which is in the water, onto a dock. What happens?

Accepted Answer

The boat moves away from the dock.

Answer

The boat and dock do not move.

Answer

The boat moves toward the dock.

Answer

The dock moves away from the boat.

Question 11

An airplane is traveling at a speed of 200 m/s relative to Earth. A person walks toward the front of the plane at a speed of 1 m/s. How fast is that person traveling in reference to the other people on the airplane?

Accepted Answer

1 m/s

Answer

0 m/s

Answer

200 m/s

Answer

201 m/s

Question 12

A moving car backs into a parked car in a parking lot. Why would the bumpers on both cars be dented?

Accepted Answer

When one car bumps into the other car, they collide with equal and opposite force.

Answer

The parked car was made of weaker material than the car that was not moving.

Answer

The car that was moving was made of weaker material than the parked car.

Answer

The bumpers of both cars would not have become dented as a result of this minor collision.

Question 13

The same force is applied separately to two object, A and B. B has twice the mass of A. What happens?

Accepted Answer

B's acceleration is half that of A.

Answer

B's acceleration is twice that of A.

Answer

B's acceleration is one-fourth that of A.

Answer

B's acceleration is four times that of A.

Question 14

A tennis ball hits a wall. Which of these statements is true?

Accepted Answer

The wall exerts a force in the opposite direction as the tennis ball's force.

Answer

The tennis ball's force is unopposed by the wall.

Answer

The tennis ball's speed doubles when it hits the wall.

Answer

The wall exerts a force in the same direction as the tennis ball's force.

Question 15

What change could cause an apple hanging from a tree branch to fall?

Accepted Answer

loss of the upwards force opposing gravity

Answer

loss of gravity

Answer

loss of a sideways force on the left

Answer

loss of a sideways force on the right

Question 16

Which forces are acting on a person who is standing still on a sidewalk?

Accepted Answer

gravity in the downward direction

Accepted Answer

the sidewalk in an upward direction

Answer

the sidewalk in the downward direction

Answer

gravity in the upward direction

Question 17

How would the forces change if a person standing still on a sidewalk started walking?

Accepted Answer

The person would exert a sideways force on the sidewalk.

Accepted Answer

The sidewalk would exert a sideways force in the opposite direction as the person.

Answer

The sidewalk would exert a sideways force in the same direction as the person.

Question 18

Two ice skaters on ice push away from each other. What will be the effect of the forces of their pushing each other if their masses are different?

Accepted Answer

The skater with the greater mass will have the lesser acceleration.

Answer

The skater with the less mass will have the lesser acceleration.

Question 19

The forces applied to an object are 8 N to the left and 5 N to the right. What is the net force on the object?

Accepted Answer

3 N to the left

Answer

3 N to the right

Answer

13 N to the right

Answer

13 N to the left

Question 20

In which situation are the forces acting on a bicycle balanced?

Accepted Answer

The bicycle moves in a straight line with constant speed as you pedal.

Answer

The bicycle speeds up as you pedal.

Answer

The speed of the bicycle is constant as it turns the corner.

Answer

The bicycle slows down as it coasts

Question 21

You're pushing a couch across a carpeted floor. What could you do to reduce the force of friction that slows your progress?

Accepted Answer

Place smooth plastic cards under the couch's legs

Answer

Push hard on the couch.

Answer

Push the couch faster.

Answer

Ask a friend to help push the couch.

Question 22

A person who weighs 500 N on Earth would weigh about 80 N on the Moon. The force of gravity is less on the Moon because ____.

Accepted Answer

the Moon has less mass than Earth.

Answer

a person loses mass when traveling to the Moon.

Answer

the Moon is far away.

Answer

scales don't work on the Moon.

Question 23

To find the net force of two objects moving in the same direction you would ____________their forces.

Accepted Answer

add

Answer

subtract

Answer

multiply

Answer

divide

Question 24

An object at rest or moving at a constant speed and in a constant direction is being acted on by _______________________force/s.

Accepted Answer

balanced

Answer

unbalanced

Answer

no

Answer

too many

Question 25

An ____________________ force always causes a change in position, speed or direction of an object.

Accepted Answer

unbalanced

Answer

balanced

Answer

unforced

Answer

subtracted

Question 26

The total amount of all the forces on an object is called the __________________________.

Accepted Answer

net force

Answer

total force

Answer

gravity

Answer

total gravity

Question 27

To find the net force of two objects moving in opposite directions you would ______________________their forces.

Accepted Answer

subtract

Answer

add

Answer

multiply

Answer

divide

Question 28

Jessica is comparing two balls. One ball has a mass of 1 kg, and the other has a mass of 2 kg. She pushes each with a force of 100 N. How do the accelerations of the two balls compare?

Accepted Answer

The 1 kg ball accelerates twice as much as the 2 kg ball.

Answer

The 1 kg ball accelerates the same as the 2 kg ball.

Answer

The 1 kg ball accelerates half as much as the 2 kg ball.

Answer

The 1 kg ball accelerates four times as much as the 2 kg ball.

Question 29

A 1 kg object accelerates at a rate of 5 m/s2. Calculate the net force on the object. Tell how its motion is changing.

Accepted Answer

5 N, The object is accelerating.

Answer

1 N, The object is accelerating.

Answer

15 N, The object is not accelerating.

Answer

0 N, The object is not accelerating.

Question 30

What is gravity?

Accepted Answer

a noncontact force

Answer

a contact force

Answer

a frictional force

Answer

a magnetic force

Question 31

Which of these is considered a contact force?

Accepted Answer

the friction between an object and air

Answer

the force between two magnets

Answer

the gravitational pull of a planet

Answer

the force between two charged particles

Question 32

A box has two forces acting on it. One force is 100N upward. Another force is 50N downward. What is the net force on the box?

Accepted Answer

50N upward

Answer

100N upward

Answer

50N downward

Answer

100N downward

Question 33

Melanie watched the path a baseball followed after a pitcher threw it. She noticed that the ball traveled horizontally away from the pitcher as well as downward toward the ground. What force caused the ball to accelerate in the downward direction when it was thrown?

Accepted Answer

gravitational force

Answer

applied force

Answer

air resistance

Answer

electrical force

Question 34

Why are some forces considered to be noncontact forces?

Accepted Answer

Objects do not have to touch each other to experience a force.

Answer

Objects must be far apart in order to exert a force

Answer

Objects push each other apart to increase the distance between them.

Answer

Objects must be large in size in size in order to exert a force that is strong enough to notice.

Question 35

Why is friction force considered to be a contact force?

Accepted Answer

Friction is produced when objects slide past one another.

Answer

Friction affects only solid objects.

Answer

Friction always acts in the same direction.

Answer

Friction acts in a direction opposite to the direction of an object's motion.

Question 36

Why is magnetic force considered to be a noncontact force?

Accepted Answer

Magnets do not have to touch each other to experience a force.

Answer

Magnets must be far apart in order to exert a force.

Answer

Magnets push each other apart to increase the distance between them.

Answer

Magnets must be large in size in order to exert a force that is strong enough to notice.

Question 37

A bird flies at 12.5 meters per second. The wind speed is 4.5 meters per second. What is the speed of the bird when it flies with the wind?

Accepted Answer

17 m/s

Answer

12.5 m/s

Answer

4.5 m/s

Answer

8 m/s

Question 38

A bird flies at 12.5 meters per second. The wind speed is 4.5 meters per second. What is the speed of the bird when it flies against the wind?

Accepted Answer

8 m/s

Answer

12.5 m/s

Answer

17 m/s

Answer

4.5 m/s

Question 39

What is the net force upward or downward?

Accepted Answer

0N

Answer

25N

Answer

50N

Answer

200N

Question 40

What is the net force to the right or left?

Accepted Answer

50N right

Answer

25N right

Answer

50N left

Answer

200N left

Question 41

the speed of an object in a particular direction

Accepted Answer

velocity

Answer

speed

Answer

acceleration

Answer

newton

Question 42

the rate at which velocity changes over time

Accepted Answer

acceleration

Answer

speed

Answer

force

Answer

newton

Question 43

the rate at which a distance is traveled

Accepted Answer

speed

Answer

acceleration

Answer

velocity

Answer

force

Question 44

forces that only act between objects that are touching

Accepted Answer

contact forces

Answer

noncontact forces

Question 45

forces that act at a distance

Accepted Answer

noncontact forces

Answer

contact forces

Question 46

a force of attraction between objects that is due to their masses and that decreases as the distance between the objects increases

Accepted Answer

gravity

Answer

friction

Answer

weight

Answer

air resistance

Question 47

a force that opposes motion between two surfaces that are in contact

Accepted Answer

friction

Answer

gravity

Answer

weight

Answer

air resistance

Question 48

a measure of the pull of gravity on mass

Accepted Answer

weight

Answer

gravity

Answer

friction

Answer

air resistance

Question 49

the force that opposes the motion of objects through air

Accepted Answer

air resistance

Answer

gravity

Answer

friction

Answer

weight

Question 50

Which of the following are contact forces?

Accepted Answer

frictional

Accepted Answer

air resistance

Answer

gravitational

Answer

magnetic

Question 51

Which of the following are noncontact forces?

Accepted Answer

gravitational

Accepted Answer

magnetic

Answer

frictional

Answer

air resistance

Question 52

Calculate the net force and direction of the object.

Accepted Answer

70N to the right

Answer

70N to the left

Answer

30N to the right

Answer

30N to the left

Question 53

Which of these describes the gravitational force from a planet?

Accepted Answer

large and pulls objects toward itself

Answer

small and pulls objects toward itself

Answer

large and pushes objects away from itself

Answer

small and pushes objects away from itself

Question 54

Which pair of objects has the largest gravitational force?

Accepted Answer

car and bowling ball

Answer

marble and car

Answer

marble and baseball

Answer

There is no gravitational force between any of these pairs of objects.

Question 55

Sean is moving heavy furniture by sliding it across the floor. He puts a blanket underneath the furniture. Why did this help him?

Accepted Answer

The friction is smaller between the blanket and the floor than between the furniture and the floor.

Answer

The blanket protects the side of the furniture from bumping against the wall.

Answer

The blanket reduces the gravitational force between the furniture and the floor.

Answer

The friction is larger between the blanket and the floor than between the furniture and the floor.

Question 56

Two basketballs are sitting 1 m apart and are not moving. Which best explains why the gravitational force does not cause them to move?

Accepted Answer

The gravitational force between the two objects is weak because their masses are small.

Answer

No gravitational force exists between the two objects because they are not touching.

Answer

The gravitational force between the two objects is weak because they are 1 m apart.

Answer

No gravitational force exists between the two objects because their masses are small.

Question 57

In which situation is it better to have

low friction?

Accepted Answer

a hockey puck slides toward the goal

Answer

a skydiver uses a parachute

Answer

a student walks down the hallway

Answer

a ladder leans against the wall

Question 58

Planets A and B are both the same size, but planet B has three times the mass of planet A. How does the weight of an object compare on the two planets?

Accepted Answer

The weight of an object is three times larger on planet B.

Answer

The weight of an object is the same on both planets.

Answer

The weight of an object is three times larger on planet A.

Answer

The weight of an object will depend on more factors than just the weight and size of the planet.

Question 59

Between which of these objects will the gravitational force be the smallest, if the objects are the same distance apart?

Accepted Answer

a marble and a baseball

Answer

a marble and a bowling ball

Answer

a baseball and a bowling ball

Answer

a bowling ball and a basketball

Question 60

Two factors affecting the magnitude of the force of gravity between 2 objects are...

Accepted Answer

mass and distance

Answer

mass and matter

Answer

distance and weight

Answer

weight and mass

Question 61

To slow the fall of an object, you want to ________ the air resistance.

Accepted Answer

increase

Answer

decrease

Question 62

To speed up the fall of an object, you want to ________ the air resistance.

Accepted Answer

decrease

Answer

increase

Question 63

How would the absence of friction affect a marble traveling on a long, straight path?

Accepted Answer

the marble would remain at a constant speed

Answer

the marble's speed would decrease

Answer

the marble's speed would increase

Answer

the marble would stop immediately

Question 64

The distance between two objects is measured from the _____ of one to the ______ of the other.

Accepted Answer

center, center

Answer

surface, center

Answer

center, surface

Answer

surface, surface

Forces, Motion, and Fields Unit 1 2022/23

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