AnswersPhysical ScienceMotion and Forces

Motion and Forces — Test Answers

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1
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Which best describes the runners?

A
Daniela gave Leonard a 5 meter head start and caught up to him at 25 meters.
B
Daniela ran faster than Leonard through the entire race.
C
Daniela ran slower than Leonard, but she went faster at the end.
D
Daniela had a 5 meter head start, and Leonard caught up to her at 25 meters.
2
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Which object requires the greatest change in momentum in order to stop its motion?

A
W
B
X
C
Y
D
Z
3

Which trial has the greatest impulse?

A
trial 1
B
trial 2
C
trial 3
D
trial 4
4

Which describes what a velocity/time graph would look like with no acceleration?

A
curved line on a upward slope
B
straight line with zero slope
C
curved line on a downward slope
D
straight line on a downward slope
5

Newton’s first law of motion was a giant leap forward in scientific thought during Newton’s time. Even today, the idea is sometimes difficult at first for people to understand. Which statement is the best example of an object and motion that would make it hard for people to accept Newton’s first law?

A
The heavier the load in a cart, the harder the cart is to turn.
B
A box does not move when pushed equally from opposite sides.
C
A wagon must be pushed before it begins to move.
D
A rolling ball eventually slows down and comes to a stop.
6

Which factors can affect the amount of friction acting on an object on a solid surface?

A
the motion of the object and the type of surface
B
the force of a push and the motion of the object
C
the weight of the object and the force of a push
D
the type of surface and the weight of the object
7

Anya knows the velocity of an object. What else does she need to know in order to find the object’s momentum?

A
its density
B
its mass
C
its speed
D
its height
8

Which statement correctly describes gravity?

A
an attractive force that acts between all objects through contact
B
an attractive force that acts between all objects without contact
C
a repulsive force that acts between all objects without contact
D
a repulsive force that acts between all objects through contact
10

Jerome solves a problem using the law of conservation of momentum. What should Jerome always keep constant for each object after the objects collide and bounce apart?

A
velocity
B
direction
C
mass
D
momentum
11

A boy and his skateboard have a combined mass of 65 kilograms What is the speed of the boy and skateboard if they have a momentum of 275 kilograms times m over s ?

A
0 meters per second
B
8.5 meters per second
C
0.24 meters per second
D
4.2 meters per second
12

Which may result from an increase in friction?

A
reduced wear and tear
B
increased speed
C
decreased traction
D
generation of heat
13

Holden is trying to determine the velocity of his race car. He went 20 meters east, turned around, and went 40 meters west. His car was 20 meters from the starting line. This took 5 seconds. What is the car’s average velocity?

A
4 m/s west
B
12 m/s west
C
12 m/s east
D
4 m/s east
14

Which change will cause the gravitational force between a baseball and a soccer ball to increase?

A
wrapping the soccer ball in layers of duct tape
B
removing the outer layer of the baseball
C
moving the balls farther apart
D
using a baseball with a thinner leather
16

How is speed calculated?

A
divide velocity by displacement
B
multiply velocity by displacement
C
multiply distance by time
D
divide distance by time
17

Which refers to the force that one massive object exerts to attract another object?

A
gravity
B
acceleration
C
velocity
D
newton
18

When discussing Newton’s laws of motion, which terms do people most likely use when talking about Newton’s third law of motion?

A
“force” and “acceleration”
B
“action” and “reaction”
C
“mass” and “inertia”
D
“inertia” and “force”
19

Which is an example of sliding friction?

A
a car’s wheels rolling down the road
B
a child applying the brakes on his bike
C
a bird flying through the air
D
a bowling ball rolling down a lane
20

An object has a mass of 5 kilograms What force is needed to accelerate it at 6 the fraction with numerator m and denominator s squared ? (Formula: cap f is equal to ma )

A
1 point 2 cap n
B
11 cap n
C
30 cap n
D
0 point 8 3 cap n
21

Micah knows that a car had a change in velocity of 15 meters per second What does Micah need to determine acceleration.

A
direction
B
distance
C
speed
D
time
22

A baseball has a mass of 0 point 4 5 kilograms and is thrown with a speed of 25 meters per second What is the momentum of the baseball?

A
0 point 0 1 8 kilograms times m over s
B
56 kilograms times m over s
C
140 kilograms times m over s
D
11 kilograms times m over s

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