Quiz about Unit 5 Motion Review

Question 1

According to Newton's third law of motion, when an astronaut pushes against another astronaut and exerts a force on them, the other astronaut --

Accepted Answer

exerts and equal force back on the first astronaut

Answer

doesn't do anything

Answer

moves at a constant speed

Answer

moves at right angles to the first astronaut

Question 2

Why are scissors considered a compound machine?

Accepted Answer

They are made of two or more simple machines.

Answer

They make work easier.

Answer

They have few to no moving parts

Answer

They can be used for many different tasks.

Question 3

Fill in the blank: Comparing output work to input work gives us _________________________ expressed as a percentage.

Accepted Answer

efficiency

Answer

force

Answer

work

Answer

power

Question 4

Force is calculated by multiplying which two factors together?

Accepted Answer

mass and acceleration

Answer

mass and speed

Answer

speed and acceleration

Answer

work and power

Question 5

The pull of gravity on a object is called its --

Accepted Answer

weight

Answer

mass

Answer

density

Answer

volume

Question 6

Which of these uses the force of gravity to make it move?

Accepted Answer

snow sliding down your jacket from a thrown snowball

Answer

throwing the snowball

Answer

wind blowing snow off the tree

Answer

making a snowman

Question 7

If Sally buys a lower-mass car such as a Prius, what will happen to the car's ability to accelerate?

Accepted Answer

It will increase.

Answer

It will decrease.

Answer

It will stay the same.

Answer

There is no relationship between mass and acceleration.

Question 8

Identify one of the simple machines that make up a pizza cutter.

Accepted Answer

wheel and axle

Accepted Answer

wedge

Accepted Answer

lever

Answer

inclined plane

Question 9

Which of these is an example of work being done on an object?

Accepted Answer

pushing your chair in

Answer

holding the door open for others

Answer

sitting on the dock fishing

Answer

holding up a banner while someone attaches it to the wall

Question 10

Why does Mercury feel the greatest gravitational pull from the Sun?

Accepted Answer

it is closest to the Sun

Answer

it is very small

Answer

it is very hot during the day and very cold at night

Answer

it has no atmosphere so isn't protected

Question 11

Which two factors are needed to calculate the amount of work done when a force moves an object?

Accepted Answer

force and distance

Answer

work and power

Answer

density and mass

Answer

mass and acceleration

Question 12

In which situation are you using an inclined plane?

Accepted Answer

climbing a ladder

Answer

tightening a screw

Answer

lifting a wheelbarrow

Answer

raising the flag

Question 13

Which is NOT an example of sliding friction?

Accepted Answer

roller skating

Answer

shuffling your feet

Answer

sledding down hill

Answer

moving the desk along the floor

Question 14

What type of friction is air resistance?

Accepted Answer

fluid friction

Answer

sliding friction

Answer

rolling friction

Answer

constant friction

Question 15

When an object's distance from another object is changing,

Accepted Answer

it is in motion.

Answer

it has a high velocity.

Answer

it is accelerating.

Answer

it is speeding.

Question 16

The line on a graph will be __________________ when an object is traveling at a constant speed.

Accepted Answer

flat/horizontal

Answer

upright/vertical

Answer

going up to the right

Answer

going down to the right

Question 17

Velocity is defined as --

Accepted Answer

speed with direction.

Answer

speed with acceleration.

Answer

mass and volume.

Answer

energy with force.

Question 18

A door knob is an example of which simple machine?

Accepted Answer

wheel and axle

Answer

lever

Answer

screw

Answer

pulley

Question 19

Being forced into the seatbelt when the car stops suddenly is an example of which of Newton's Laws of Motion?

Accepted Answer

1st

Answer

2nd

Answer

3rd

Answer

4th

Question 20

If George pushes on an object with 200N force but can't get it to move, how much work has he done?

Accepted Answer

none because it didn't move

Answer

200 J

Answer

there is information missing

Answer

you can't divide by zero

Question 21

If a bus travels 14 km between bus stops and it takes 0.25 hr to get there, what is it's speed?

Accepted Answer

56 km/h

Answer

14.25 km/h

Answer

39 km/h

Answer

3.5 km/h

Question 22

Once the bus closes its doors and is ready to leave, it takes 90 s to go from stopped to 16 m/s. What is its acceleration?

Accepted Answer

5.6 m/s2

Answer

106 m/s2

Answer

74 m/s2

Answer

12 m/s2

Question 23

How much force is applied to brakes if a 9-kg bicycle requires 2 m/s²of acceleration to slow down?

Accepted Answer

18 N

Answer

11 N

Answer

4.8 N

Answer

7 N

Question 24

If lifting a bag of groceries onto the counter requires 20 N of force and the counter is 2 meters high, how much work did you do while helping your family?

Accepted Answer

40 J

Answer

22 J

Answer

18 J

Answer

10 J

Question 25

When doing a chin-up, a student uses 102.9 J of work to lift his body up and it takes 2 seconds to do this, how much power is he using?

Accepted Answer

51.5 W

Answer

104.9 W

Answer

100.9 W

Answer

75.2 W

Unit 5 Motion Review

25 questions