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PHYS U6 Test Review (Energy)

Total questions: 61

Worksheet time: 2hrs 53mins

Name
Class
Date
1.

_ is the energy it takes to apply a force that moves an object.

a)

Work

b)

Power

c)

Watts

d)

Kinetic Energy

e)

Potential Energy

2.

_ is how fast work is done or how fast energy is used.

a)

Work

b)

Power

c)

Energy

d)

Force

e)

Conservation

3.

_ is the ability to do work or move objects.

a)

Work

b)

Power

c)

Watts

d)

Energy

e)

Calories

4.

_ is the metric unit for measuring energy.

a)

horsepower

b)

Newtons

c)

Watts

d)

Joules

e)

Calories

5.

_ is the metric unit for measuring power; it’s equal to 1 J/s.

a)

horsepower

b)

kiloWatt⋅hour

c)

Watts

d)

Joules

e)

Calories

6.

_ is the power of a typical horse being used to turn a capstan; it’s equal to 746W.

a)

Imperial horsepower

b)

kiloWatt⋅hour

c)

Watts

d)

Joules

e)

Calories

7.

_ is the imperial unit for measuring energy in food.

a)

horsepower

b)

Newtons

c)

Watts

d)

Joules

e)

Calories

8.

_ is the energy due to motion.

a)

Kinetic energy

b)

Potential energy

c)

chemical potential energy

d)

work

e)

thermal energy

9.

_ is the stored energy due to position or condition.

a)

Kinetic energy

b)

Potential energy

c)

calories

d)

work

e)

pendulum

10.

A _ is a freely swinging weight hung from a fixed point.

a)

Rube Goldberg Machine

b)

horsepower

c)

calorie

d)

fulcrum

e)

pendulum

11.

_ energy is heat, which measures particle motion.

a)

Thermal

b)

Vibrational

c)

Nuclear

d)

Chemical

e)

Radiant

12.

_ energy comes from vibrations in air molecules.

a)

Heat

b)

Sound

c)

Nuclear

d)

Chemical

e)

Radiant

13.

_ energy is energy in the form of waves, like light.

a)

Thermal

b)

Vibrational

c)

Nuclear

d)

Chemical

e)

Radiant

14.

_ potential energy is energy stored in chemical bonds, like food and fuel.

a)

Thermal

b)

Vibrational

c)

Nuclear

d)

Chemical

e)

Radiant

15.

_ potential energy is the energy stored in the atom.

a)

Thermal

b)

Vibrational

c)

Nuclear

d)

Chemical

e)

Radiant

16.

_ energy is the energy of moving electrons in wires.

a)

Electric Current

b)

Electric Potential

c)

Elastic

d)

Gravitational

e)

Magnetic

17.

_ energy is the energy stored in a battery.

a)

Electric Current

b)

Electric Potential

c)

Elastic

d)

Gravitational

e)

Magnetic

18.

_ potential energy is energy stored due to height above the Earth’s surface.

a)

Electric Current

b)

Electric Potential

c)

Elastic

d)

Gravitational

e)

Magnetic

19.

_ energy comes from the attractive & repulsive forces between charged particles.

a)

Electric Current

b)

Electric Potential

c)

Elastic

d)

Gravitational

e)

Magnetic

20.

_ potential energy is energy stored in something that bends, stretches, or deforms.

a)

Electric Current

b)

Electric Potential

c)

Elastic

d)

Gravitational

e)

Magnetic

21.

_ energy is the sum of the kinetic and potential energies on an object.

a)

Kinetic

b)

Potential

c)

Mechanical

d)

Total

e)

Net

22.

This states that the total work done on an object equals the change in its

kinetic energy.

a)

Work-Energy Theorem

b)

Law of Conservation of Energy

c)

First Law of Thermodynamics

d)

Hooke’s Law

e)

none of these

23.

This states that energy cannot be created nor destroyed.

a)

Work-Energy Theorem

b)

Law of Conservation of Energy

c)

First Law of Thermodynamics

d)

Hooke’s Law

e)

none of these

24.

Work and Energy are both ____ quantities.

a)

scalar

b)

vector

c)

none of these

25.

If you punch a wall with 50N of force and the wall does not move, how much work is done to the wall?

a)

0 J

b)

50 J

c)

none of these

d)

100J

e)

unknown

26.

Work is done only when the applied force is (or partially is) ___ direction as the

direction of motion.

a)

…in the same…

b)

…in the opposite…

c)

none of these

d)

…perpendicular to the…

e)

unknown

27.

The total energy in the universe is ___.

a)

constant

b)

increasing

c)

decreasing

d)

fluctuating

e)

unknown

28.

Friction converts some useful energy into __ and __ energy. (Select 2 answers)

a)

thermal (heat)

b)

vibrational (sound)

c)

elastic

d)

potential

e)

chemical

29.

If a 1kg ball has 100J of Potential Energy at the top of a hill, how much Kinetic Energy will it have when it rolls to the bottom of the hill?

a)

100 J

b)

-100 J

c)

0 J

d)

50 J

e)

unknown

30.

You carry a 14N cat horizontally by 2m. What is the work done on the cat? W=Fx

a)

28 J

b)

7 J

c)

0 J

d)

274 J

e)

unknown

31.

A cat is climbing a bookcase to catch a bug on the top. On which shelf will the cat have the most potential energy?

a)

the highest shelf

b)

the lowest shelf

c)

a middle shelf

d)

they are all equal

32.

The same cat jumps off of the bookshelf to the floor. The cat will land with the highest speed if it jumps from __.

a)

the highest shelf

b)

the lowest shelf

c)

a middle shelf

d)

they are all equal

33.

To increase an object’s Kinetic Energy, you can increase its mass or ____.

a)

velocity

b)

height

c)

gravity

d)

time

34.

To increase an object’s Potential Energy, you can increase its mass or ___

a)

velocity

b)

height

c)

gravity

d)

time

35.

To increase power, you can increase all of the following EXCEPT ___.

a)

velocity

b)

force

c)

time

d)

energy

36.

What does kWh (kiloWatt-hours) measure ?

a)

momentum

b)

force

c)

time

d)

energy

e)

power

37.

If a grandfather clock is running too slow, how can you improve its timing?

a)

Increase the length (L)

b)

decrease the length (L)

c)

increase the mass of the bob

d)

decrease the mass of the bob

e)

none of these

38.

At which point on the diagram does the pendulum's bob have the most Kinetic Energy (KE)?

a)

A

b)

B

c)

C

d)

all of these

e)

none of these

39.

At which point on the diagram does the pendulum's bob have the most Potential Energy?

a)

A

b)

B

c)

C

d)

all of these

e)

none of these

40.

At which point on the diagram does the pendulum's bob have the least Potential Energy?

a)

A

b)

B

c)

C

d)

all of these

e)

none of these

41.

At which point on the diagram does the pendulum's bob have the least Kinetic Energy?

a)

A

b)

B

c)

C

d)

all of these

e)

none of these

42.

At which point on the diagram is the pendulum's bob is moving the fastest?

a)

A

b)

B

c)

C

d)

all of these

e)

none of these

43.

At which point on the diagram is the pendulum's bob is moving the SLOWEST?

a)

A

b)

B

c)

C

d)

all of these

e)

none of these

44.

Short Answer Question on test: Why does the pendulum eventually stop swinging?

a)

Friction in the air and fulcrum converts all its energy into heat and sound.

b)

All of the potential energy gets converted into work energy.

c)

Gravity pulls it down until it stops.

d)

It stops swinging when a person stops pushing it.

e)

none of these

45.

At which point on the diagram does the roller coaster car have the most Kinetic Energy?

a)

A

b)

B

c)

C

d)

all of these

e)

none of these

46.

At which point on the diagram does the roller coaster car have the least Kinetic Energy?

a)

A

b)

B

c)

C

d)

all of these

e)

none of these

47.

At which point on the diagram does the roller coaster car have the least Potential Energy?

a)

A

b)

B

c)

C

d)

all of these

e)

none of these

48.

At which point on the diagram does the roller coaster car have the most Potential Energy?

a)

A

b)

B

c)

C

d)

all of these

e)

none of these

49.

At which point on the diagram is the roller coaster car traveling the fastest?

a)

A

b)

B

c)

C

d)

all of these

e)

none of these

50.

At which point on the diagram is the roller coaster car traveling the SLOWEST?

a)

A

b)

B

c)

C

d)

all of these

e)

none of these

51.

SHORT ANSWER: Do you think a real Hotwheels roller coaster car can travel through the loop without falling off if it starts at point A? Explain your reasoning.

a)

NO because there is too much friction; the lift needs to be 2.5 times taller than the loop.

b)

NO because a real roller coaster is too heavy with people.

c)

YES because the lift is taller than the loop.

d)

YES because real roller coasters have engines to propel them.

e)

UNKNOWN. Not enough information.

52.

At what point(s) does the ball have the most Potential Energy?

a)

a

b)

b

c)

c

d)

d

e)

e

53.

At what point(s) is the ball's GPE converted into Kinetic Energy?

a)

a

b)

b

c)

c

d)

d

e)

e

54.

The ball's Kinetic Energy is converted into what three forms of energy at point c (when it hits the floor and bounces)?

a)

EPE

(elastic)

b)

CPE

(chemical)

c)

TE

(heat)

d)

VE

(sound)

e)

RE

(radiant)

55.

Why does the ball eventually stop bouncing?

(This is a short answer question on your test.)

a)

It stops when all of its initial GPE is converted to heat and sound from friction.

b)

Gravity eventually pulls it down.

c)

It stops when all of its initial energy is converted into Potential Energy.

d)

It stops when the chemical bonds of the ball break down.

e)

none of these

56.

A ball rolls down a hill from a height of 10m. GPE=mgh and KE=½mv².

What's the correct equation for calculating the ball's velocity at ground level?

a)

v=2ghv=\sqrt[]{2gh}

b)

v = 2gh

c)

v=2KEmv=\sqrt[]{\frac{2KE}{m}}

d)

v = 2KE/m

e)

none of these

57.

A car that weighs 15000N traveled 30m in 0.5s. How powerful is the car? P=FΔxtP=\frac{F\Delta x}{t}

a)

900 000 Watts

b)

250 Watts

c)

1000 Watts

d)

225 000 Watts

e)

none of these

58.

A car that weighs 15000N collides with a tree with an impact velocity of 20m/s (45mph). How powerful was the collision? P=Fv

a)

300 000 Watts

b)

750 Watts

c)

3 000 000 Watts

d)

675 000 Watts

e)

none of these

59.

Convert 300000 Watts into horsepower. 1hp=746Watts.

a)

402 hp

b)

223800000 hp

c)

300 hp

d)

408 hp

e)

none of these

60.

Convert 5 Watts into kiloWatts.

a)

0.005 kWatt

b)

0.05 kWatt

c)

5000 kWatt

d)

500 kWatt

e)

none of these

61.

A child's night light is 5 Watts. Electricity costs $0.15/kWh. If the night light runs continuously for 30 days, how much does that cost? Cost = (Power in kWatts)(time in hours)(price per kWh)

a)

$0.54

b)

$540

c)

$22.50

d)

$0.60

e)

none of these