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WJEC 6.3 Work and Energy

Total questions: 30

Worksheet time: 20mins

Name
Class
Date
1.
Energy due to motion is ____________ energy. 
a)
Potential 
b)
Energy
c)
Kinetic
d)
Friction
2.
__________ is stored energy. 
a)
Potential
b)
Kinetic
c)
None of the above 
d)
All of the above 
3.
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 
4.
When you stretch a rubber band, you are storing __________ energy. 
a)
gravitational potential
b)
elastic potential
c)
kinetic 
d)
none of the above 
5.
Energy can not be created or destroyed, only converted from one form to another.
a)
true
b)
false
6.
At which point is potential energy greatest?
a)
W
b)
X
c)
Y
d)
Z
7.
As a pendulum swings from its highest to lowest position, what happens to its kinetic and potential energy? 
a)
Both the potential energy and kinetic energy decrease
b)
The potential energy decreases while the kinetic energy increases 
c)
The kinetic energy decreases while the potential energy increases 
d)
Bothe the potential energy and kinetic energy increase 
8.
At which point is kinetic energy greatest? 
a)
W
b)
X
c)
Y
d)
Z
9.
When a pendulum swings, at which point is kinetic energy highest?
a)
1
b)
2
c)
3
d)
4
10.
When a pendulum swings, at which point is potential energy at its greatest?
a)
1
b)
2
c)
3
d)
4
11.
if you push a cart with a force of 60 N resulting in 120 J of work.. how far did you move the cart? 
a)
7200 m
b)
0 m
c)
2 N 
d)
2 m
12.

How much work is being done with 200 N of force to the right on object that moves 426 meters to the right? (assume the force and displacement are in the same direction)

a)

85,200 J

b)

45,620 J

c)

90,480 J

d)

62,329 J

13.
3. Calculate the PE of a 2 kg cat perched 10 meters above the ground. 
a)
20 J
b)
200 J
c)
2.04 J
d)
200 W
14.
A 1 kg rock falls 20 meters, how fast is the rock going just before it hits the ground?
a)
14.0 m/s
b)
20.0 m/s
c)
10.0 m/s
d)
9.89 m/s
15.
When my velocity triples, my kinetic energy increases by ______ times.
a)
9
b)
 3 
c)
1.5
d)
4.5
16.
Calculate the Kinetic Energy (KE) of a girl whose mass is 50 kg and who is moving at 4 m/s.
a)
200 J
b)
800 J
c)
400 J
d)
100 J
17.
If height above the ground increases 4 times, how much does your potential energy (PE) change?
a)
16 times
b)
4 times
c)
2 times
d)
No change
18.
The change in KE or change in PE is equal to Work.
a)
True
b)
False
19.
If F is force, k is spring constant and x is extension, Hooke's Law tells us that:
a)
F=k/x
b)
x=Fk
c)
k=Fx
d)
F=kx
20.
Hooke's Law fails when a material reaches its:
a)
breakdown
b)
elastic limit
c)
end of tether
d)
fracture stress
21.
A graph of extension against force for an elastic material is:
a)
A downward curve
b)
An upward curve
c)
A straight line from any point on the x and y axis
d)
A straight line from the origin
22.
A stiff material has a:
a)
high spring constant
b)
low spring constant
c)
spring constant of any value
d)
spring constant which is difficult to predict
23.

A bungee rope has a spring constant of 5N/m. How much a person must weighs in Newton if we want it to extend (stretch) 10m?

a)

20N

b)

22cm

c)

50N

d)

50cm

e)

21N

24.

What is the spring constant of a bungee rope in N/m if a person weighs 100 N if we want it to extend (stretch) 20m?

a)

5N/m

b)

5N/cm

c)

5N

d)

10N

e)

10N/m

25.

What is the best description of the relationship shown in this graph?

a)

In this graph, the relationship between force and extension is linear.

b)

In this graph, the relationship between force and extension is non-linear.

c)

In this graph, the relationship between force and extension is directly proportional.

d)

In this graph, there is no relationship between force and extension.

26.
Hooke's Law describes the behaviour of which kind of material under tension?
a)
plastic
b)
metals only
c)
elastic
d)
non-metals only
27.

When comparing spring A to B,

a)

both experience the same maximum force

b)

both experience the same elongation

c)

both store the same amount of elastic potential energy

d)

both have identical spring constants

28.

When comparing spring A to B,

a)

A has a larger spring constant than B so A is a stiffer spring

b)

B has a larger spring constant than A so A is a stiffer spring

c)

A has a larger spring constant than B so B is a stiffer spring

d)

B has a larger spring constant than A so B is a stiffer spring

29.
Which of the following springs is the stiffest?
a)
A spring that requires a froce of 2000 N to compress it by 6.8 m.
b)
A spring that requires a force of 4000 N to stretch it by 9.0 m. 
c)
A spring that requires a force of 8000 N to compress it by 45 m.  
d)
A spring that requires a force of 4800 N to stretch it by 14 m.
30.

A single spring is stretched by x when a mass m is attached. An identical spring is joined in series to the first spring. How much will the two springs stretch when a mass m is attached? (Assume the springs have negligible mass)

a)

The spring will stretch by 2x since each spring stretches by x

b)

The spring will stretch by x since the spring constant remains the same

c)

The spring will stretch by 0.5x since there are 2 springs holding the mass

d)

There is not enough information to answer

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