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Unit 5 Test review - Take 2!

Total questions: 38

Worksheet time: 45mins

Name
Class
Date
1.
How much power is the  tractor that drags a plow with a force of 500 N a distance of 10 meters in 20 seconds?
a)
250 Watts
b)
250 Joules
c)
100,000 Watts
d)
100,000 Joules
2.

Energy of moving particles is

a)

thermal energy

b)

chemical energy

c)

nuclear energy

d)

solar energy

3.

The Law of Conservation of Energy says energy can be:

a)

created from nothing by people

b)

destroyed by people

c)

destroyed by stars

d)

neither created nor destroyed

4.

chemical energy --> mechanical energy

a)

Plants use sunlight to make food

b)

gears turn on a bicycle making noise

c)

Sunlight can heat things up

d)

you eat lunch to have energy to walk around

5.

The unit for energy

a)

Joules

b)

watts

c)

Newtons

d)

seconds

e)

meters

6.

What is the KE of a 40 kg toy bicycle that is moving at 2 m/s?

a)

10 J

b)

20 J

c)

80 J

d)

160 J

7.

A 75 kg skier is standing at the top of a 25 m hill. What would his kinetic energy at the bottom of the hill be?

a)

18,375 m/s

b)

11.06 m/s

c)

240,000 m/s

d)

22.1 m/s

8.
An object has 64 J of kinetic,134 J of potential, then it will have _____ of mechanical energy.
a)
8,576 J
b)
189 J 
c)
70J
d)
198 J 
9.
At which point(s) on the roller coaster is the gravitational potential energy at its maximum?
a)
A
b)
B
c)
C
d)
D
10.
What is the v in this equation? Choose the one with the CORRECT unit!
a)
volume (m3)
b)
velocity (m/s)
c)
velocity (m/s2)
d)
volume (v)
11.

What is a screw?

a)

means attracted to a magnet

b)

an inclined plane that is wrapped around a cylindrical post

c)

stiff bar that rests on a fulcrum

d)

made of 2 inclined planes that are back to back

12.
What is a compound machine?
a)
uses a wheel and rope to lift a load
b)
wheel that turns on a post
c)
flat surface that is higher at one end
d)
made from two or more simple machines
13.
Which of the following shows an energy transformation from chemical energy to electrical to light energy?
a)
A bolt of lightning lights the night sky.
b)
A candle glows brightly in the dark.
c)
A fire in a fireplace lights up a room.
d)
A battery causes a flashlight to shine.
14.
People get energy from the food that they eat and transform that energy as they move. Which energy transformations occur as a student rapidly rubs the palms of his hands together?
a)
mechanical to thermal to electrical
b)
chemical to mechanical to thermal
c)
mechanical to chemical to sound
d)
chemical to sound to electrical
15.
According to the Law of Conservation of Energy, energy cannot be _________ or ____________. 
a)
destroyed, destroyed
b)
created, saved
c)
created, destroyed
d)
lost, found
16.
Energy transformations occur when...
a)
energy is created through conduction
b)
energy changes from one form to another
c)
two forces slide together that are touching
d)
a chemical reaction takes place
17.
Gravitational potential energy depends on the ________ and ________ of the object. 
a)
Height and mass
b)
Friction and movement
c)
Mass and Movement
d)
Height and Friction 
18.

The picture showing the energy conversion

Light → chemical

is:

a)
b)
c)
d)
19.

If you complete the same amount work as someone, but in less time

a)

You are more powerful

b)

You are less powerful

c)

You have the same power

20.
Power is:
a)
How fast work is done.
b)
A force applied through a distance.
c)
speed in a given direction
d)
work multiplied by time
21.

Which of these is an example of a wedge?

a)

skateboard

b)

ax

c)

stairs

d)

bottle cap

22.
What do we call two or more simple machines being used together?
a)
Lever
b)
Dual machine
c)
Triple machine
d)
compound machine
23.
Force is measured using which type of unit?
a)
Meters
b)
Kilograms
c)
Newtons
d)
Joules
24.
The amount of energy in the universe?
a)
keeps changing
b)
increases
c)
decreases
d)
remains constant
25.
The diagram shows a cart at four positions as it moves along its frictionless track, at which positions are the sum of the potential energy and kinetic energy are the same?
a)
A and B only
b)
B and C only
c)
C and D only
d)
all positions A-D
26.

What is true about the mechanical energy of the rock, after it leaves the bridge?

a)

PE decreases while the KE increases, but the ME remains the same.

b)

potential energy increases as it nears the ground.

c)

momentum is conserved

27.
Rank the kinetic energy from highest to lowest of a car, u-haul truck, and bicycle if they are all traveling at the same speed.
a)
car, u-haul, bicycle
b)
bicycle, car, u-haul
c)
they all have the same kinetic energy
d)
u-haul, car, bicyle
28.
 What are the units for work and energy respectively?  
a)
joules and watts
b)
joules and joules
c)
watts and joules
d)
newtons and joules
29.
What type of energy deals with the moving of particles (slowing down or speeding up)?
a)
Chemical Potential energy
b)
Radiant energy
c)
Thermal energy
d)
Nuclear energy
30.

What is the energy conversion when you burn wood for a fire?

a)

electrical to thermal

b)

light to motion

c)

chemical to thermal

d)

chemical to electrical

31.

What is the energy conversion when you put batteries in a flashlight to make it turn on?

a)

chemical to light

b)

light to motion

c)

chemical to thermal

d)

nuclear to light

32.

What is the energy conversion when you plug in a charger to charge a battery?

a)

electrical to light

b)

kinetic to potential

c)

thermal to chemical

d)

electrical to chemical

33.

What is the energy conversion when you plug in a fan?

a)

potential to motion

b)

potential to heat

c)

heat to electrical

d)

electrical to motion

34.
An explosion of gas from a Hawaiian volcano blows a rock into the sky. the rock has 2000J of kinetic energy. What was its mass if the rock had a velocity of 20m/s
a)
200Kg
b)
20,000Kg
c)
10Kg
d)
200Kg
35.
What is the kinetic energy of a 4kg shotput thrown with a velocity of 13m/s
a)
676 J
b)
3.25 J
c)
17J
d)
338 J
36.
Where would you find the MAX amount Gravitational Potential Energy on a rollercoaster? 
a)
Bottom of 1st hill
b)
Top of loop 
c)
Bottom of 2nd hill
d)
Top of the tallest hill 
37.

If a racer used 74 Newtons to climb a tower 320 meters high, then how much power did she develop in those 798 seconds?

a)

29.6 watts

b)

23,680 Joules

c)

317 Watts

d)

313 Watts

38.

A construction worker uses a pulley and a rope to raise an 85 Newton person to a height of 2 m in 6 s. How much work did he do?

a)

1020 J

b)

170 J

c)

278 J

d)

417 J

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