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Energy in Real World Systems & Useful Energy

Total questions: 53

Worksheet time: 42mins

Name
Class
Date
1.
gravitational potential energy is defined as
a)
the energy an object has due to its height above the ground
b)
the energy an object has due to its motion
c)
the energy a spring has due to its stretch
d)
the chemical energy stored in the molecules of atoms
2.
the equation for gravitational potential energy is 
a)
PEg = mgh
b)
PEg= 1/2kx2
c)
PEg= Fd
d)
PEg = 1/2mv2
3.
What are the two types of Mechanical Energy? (ME)
a)
Kinetic and Potential Energy
b)
Kinetic and Nuclear Energy
c)
Potential and Chemical Energy
d)
Thermal and Kinetic Energy
4.
Kinetic Energy is defined as
a)
Energy stored due to its location
b)
Energy of motion
c)
Energy stored in the bonds of molecules
d)
Heat energy
5.
The equation to find kinetic energy is
a)
KE=1/2mv2
b)
KE=mgh
c)
KE=1/2kx2
d)
KE=Fd
6.
A 70 kg runner has a velocity of 5 m/s. Her kinetic energy is
a)
875 J
b)
175 J
c)
1750 J
d)
350 J
7.
Which of the following objects has the most kinetic energy?
a)
A 20 kg toddler running at 5 m/s
b)
A 50 kg toddler running at  30 m/s
c)
A 90 kg toddler running at 30 m/s
d)
A 100 kg  toddler running at 2 m/s
8.
A 5 kg ball is lifted 12 m above the ground. It's gravitational potential energy is
a)
60 J
b)
600 J
c)
17 J
d)
2.4 J
9.
You drop a 5 kg ball from a height of 2 m. Just before it reaches the ground, what type of energy does it have?
a)
Potential Energy
b)
Kinetic Energy
c)
Nuclear Energy
d)
Chemical Energy
10.
You drop a 5 kg ball from a height of 2 m. Just before it reaches the ground, how much kinetic energy does it have?
a)
10 J
b)
100 J
c)
7 J
d)
20 J
11.
You drop a 5 kg ball from a height of 2 m. Just before it reaches the ground, what is the ball's velocity?
a)
6.32 m/s
b)
40 m/s
c)
4.47 m/s
d)
100 m/s
12.
A 2 kg ball has an initial velocity of 6 m/s. How high up the ramp will it go?
a)
1.8 m
b)
10 m
c)
6 m
d)
12 m
13.
What does friction produce?
a)
light
b)
sound
c)
heat
d)
gravity
14.
What direction does friction act relative to motion?
a)
in the same direction
b)
in the opposite direction 
c)
need more information
d)
depends on the force
15.
The force that acts in the opposite direction of motion when two surfaces come in contact. 
a)
Force
b)
Friction
c)
Static
d)
Kinetic 
16.
What does friction produce?
a)
light
b)
sound
c)
heat
d)
gravity
17.

Rubber is a surface with ____ friction.

a)

High

b)

Low

18.

Friction depends on the ______ of surfaces.

a)

pascals

b)

material

c)

roughness

d)

smoothness

19.

Which material is the best conductor of heat?

a)

glass

b)

styrofoam

c)

metal

d)

wood

20.

Heat transfer always moves ...

a)

cold to hot

b)

east to west

c)

hot to cold

d)

north to south

21.
Diagram above shows milk at temperature 80oC immersed in water at temperature 10oC. Which statement is correct when milk and water eventually achieved thermal equilibrium?
a)
There is no flow of heat between milk and water.
b)
The net flow of heat between milk and water is zero.
c)
The temperature of milk and water will be the same at 10oC.
d)
The temperature of milk and water will be the same at 80oC.
22.
When you rub your hands together friction is transformed into ___________ energy.
a)
electromagnetic
b)
chemical
c)
nuclear
d)
thermal
23.

Mrs. Day is walking on the beach and the heat from the sand is not flowing to her feet. What must be true?

a)

She is walking really fast.

b)

The temperature of the sand and her feet are the same

c)

The sand has more thermal energy

d)

Her feet have more thermal energy

24.
How does the thermal energy flow in a glass of ice tea?
a)
from the ice to the tea
b)
from the tea to the ice
c)
there is no flow
d)
it looks good - now I am thirsty
25.
The kid ate some spaghetti and then started playing with his toys. What is the energy transformation that is taking place?
a)
thermal converted to kinetic
b)
electrical converted to thermal
c)
kinetic converted to chemical
d)
chemical to mechanical
26.
When you strike a match and light some logs on fire, what is the energy transformation that is taking place?
a)
heat to kinetic to potiential
b)
kinetic to thermal to light
c)
chemical to light to thermal
d)
light to chemical to thermal
27.
How do the particles move in a liquid if thermal energy was added to it?
a)
very slow then stop
b)
kinda fast then slowing down
c)
fast then move faster 
d)
no movement at all
28.

Which is not a part of the law of conservation of energy?

a)

electrical converted into mechanical in a fan

b)

potential transformed into kinetic on a roller coaster

c)

multiple energy changes from one form to another

d)

potential energy is lost when you go down a coaster

29.
What causes the ice cream to change it's state of matter from a solid to a liquid?
a)
increase in chemical
b)
decrease in chemical 
c)
increase in kinetic
d)
decrease in kinetic
30.
When does thermal energy transfer end?
a)
it never ends
b)
both reach the same temperature
c)
when it starts boiling
d)
when you measure them
31.

Thermal energy is transferred from ..........

a)

higher temperature --> lower temperature

b)

lower temperature --> higher temperature

c)

lower density --> higher density

d)

higher density --> lower density

32.

Object A and B are in thermal equilibrium when .........

a)

Their density is the same

b)

Their temperature is the same

c)

Their density is the different

d)

their temperature is different

33.

what is the name of lowest possible temperature?

a)

absolute zero

b)

thermodynamics zero

c)

zero temperature

34.

What is absolute zero?

a)

0 oC

b)

0 K

c)

0 J

d)

0 kg

35.

An open system

a)

A.Is a specified region where transfers of energy and/or mass take place

b)

B.Is a region of constant mass and only energy is allowed to cross the boundaries

c)

C.Cannot transfer either energy or mass to or from the surroundings

d)

D.Has a mass transfer across its boundaries, and the mass within the system is not necessarily constant

e)

E.None of the above

36.

Which way does heat flow?

a)

hot to cold

b)

cold to hot

37.
This law states that the energy in the universe is constant.  Energy cannot be created nor destroyed but changed from one form to another.  Which law is this?
a)
Third Law of thermodynamics
b)
Second Law of thermodynamics
c)
First Law of thermodynamics
38.
The first law of thermodynamics states that energy is
a)
created
b)
destroyed
c)
conserved
d)
created and destroyed
39.

Which of the following is true of a closed system?

a)

There are no matter and energy exchanges across system boundaries.

b)

Matter and energy exchanges occur across system boundaries only rarely.

c)

All energy transfers start with potential energy.

d)

Entropy does not occur in closed systems.

40.

When is work done on an object?

a)

When an object has a net force applied to it.

b)

When an object moves while a net force is being applied to it

c)

When an object doesn't move while a net force is applied to it

d)

When an object is moving without a net force being applied to it

41.

When the weightlifter holds the weight above his head he may get incredibly tired, ...

a)

He is getting tired because he is doing work on the barbell of weights

b)

He is getting tired because his muscles are stretching and squeezing to do work on the barbell of weights

c)

He is now the equivalent of a table with weights on it.

d)

He is getting tired because his muscles are stretching and squeezing, but he is not doing work on the barbell of weights

42.

What just happened in this picture?

a)

The weight lifter did work by lifting the barbells from the floor to above his head.

b)

The weight lifter did not do work when lifting the barbells above his head.

c)

The weight lifter did no work because he is just a table for weights.

d)

The barbells did work on the weight lifter when lifted from the ground to above the weight lifters head.

43.

The units of measurement for work are?

a)

Newton

b)

Newton*meter

c)

Joule

d)

Watt

e)

Joule per second

44.

Suppose that you apply a 100 Newton horizontal force to a box on the floor, which pushes the box 10 meters. How much work do you do on the box?

a)

100 J

b)

1 J

c)

1000J

d)

10000J

e)

1 kJ

45.

A megajoule is how many joules?

a)

1

b)

100,000

c)

1,000

d)

1,000,000

e)

100

46.

A kilojoule is how many joules?

a)

1

b)

100

c)

10,000

d)

100,000

e)

1,000

47.

What are the two forms of mechanical energy?

a)

elastic

b)

kinetic

c)

potential

d)

chemical

e)

gravitational

48.

To find gravitational potential energy on Earth we use which of the following equations?

a)

PE = m*g*h

b)

PE = m*v*d

c)

PE = m*g*s

d)

PE = m*g/h

e)

PE = m*v/g

49.

The work required to bring an object up to a final speed from rest is called what?

a)

gravitational potential energy

b)

chemical energy

c)

thermal energy

d)

potential energy

e)

kinetic energy

50.

The work required to slow down an object down to rest from some initial speed is called what?

a)

gravitational potential energy

b)

chemical energy

c)

thermal energy

d)

potential energy

e)

kinetic energy

51.

The kinetic energy of an object increases by what factor if the velocity is doubled?

a)

a factor of one half

b)

a factor of double

c)

a factor of triple

d)

a factor of quadruple

52.

The kinetic energy of an object increases by what factor if the mass is doubled?

a)

a factor of one half

b)

a factor of double

c)

a factor of triple

d)

a factor of quadruple

53.

The units of measurement for kinetic energy are?

a)

Newton

b)

Newton*meter

c)

Joule

d)

Watt

e)

Joule per second

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