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WorksheetsCP7/8 Energy - Forces Doing Work (Standard)
Total questions: 26
Worksheet time: 13mins
Name
Class
Date
1.
8.2 Describe the energy transfer when an electric light bulb is turned on
a)
electrical energy --> sound energy and light energy
b)
electrical energy --> light energy and heat energy
c)
electrical energy --> light energy and kinetic energy
2.
8.2 Describe the energy transfer when a candle is lit
a)
Thermal energy --> light energy
b)
Chemical energy --> light and sound energy
c)
Chemical energy --> light and thermal energy
3.
8.6 State the equation to calculate work done
a)
work done = force x distance
b)
work done = force / distance
c)
work done = force x time
d)
work done = force x power
4.
8.5 State the unit for work done
a)
m
b)
N
c)
J
d)
Kg
5.
8.6 Force is measured in:
a)
Metres
b)
Seconds
c)
Newtons
d)
Joules
6.
8.6 Calculate the work done when a weightlifter lifts a 280N barbell weight 1.5m straight up
a)
186.6J
b)
420J
c)
0.005J
7.
8.6 Calculate the work done when a boy cycles 760m against friction forces of 140N
a)
106,400J
b)
5.43J
c)
0.18J
8.
8.12 Define power
a)
The transfer of energy whenever things happen
b)
The rate at which energy is transferred
c)
The wattage of an appliance
9.
8.14 Power is measured in:
a)
Watts
b)
Joules
c)
Newtons
d)
Seconds
10.
8.14 The definition for 1 Watt is:
a)
1 Newton of force transferred per second
b)
1 joule of work done per second
c)
1 metre travelled by an object in 1 second
11.
8.13 Recall the equation to calculate power
a)
Power = Energy x Time
b)
Power = Energy x Distance
c)
Power = Energy / Time
d)
Power = Energy / Distance
12.
8.13 Calculate the power when a girl transfers 300J of kinetic energy in 2 seconds
a)
600W
b)
150W
c)
0.006W
13.
8.13 Calculate the time it takes for an 200W appliance to transfer 800J of energy
a)
4s
b)
160,000s
c)
0.0025s
14.
9.1 An example of a contact force is:
a)
Friction
b)
Magnetism
c)
Gravitational
15.
9.1 An example of a contact force is:
a)
Gravitational
b)
Upthrust
c)
Electrostatic
d)
Magnetism
16.
9.1 An example of a non-contact force is
a)
Friction
b)
Tension
c)
Gravitational
d)
Air resistance
17.
9.1 An example of a non-contact force is:
a)
Magnetism
b)
Tension
c)
Water resistance
d)
Upthrust
18.
9.1 An example of a non-contact force is:
a)
Air resistance
b)
Electrostatic
c)
Friction
d)
Upthrust
19.
9.1 Explain what a contact force is
a)
A force that acts on an object by touching it
b)
A force that acts on an object without touching it
20.
9.1 Explain what a non-contact force is
a)
A force that acts on an object by touching it
b)
A force that acts on an object without touching it
21.
9.2 State the definition for a scalar quantity
a)
A quantity that has magnitude (size) and direction
b)
A quantity that has magnitude (size) but no direction
22.
9.2 State the definition for a vector quantity
a)
A quantity that has magnitude (size) and direction
b)
A quantity that has magnitude (size) but no direction
23.
9.1 Non-contact forces are vectors
a)
True
b)
False
24.
9.1 A magnet can only attract other objects made from magnetic materials
a)
True
b)
False
25.
9.1 Only very large objects with large mass have gravitational force fields
a)
True
b)
False
26.
9.1 Electrostatic fields can affect all objects within it
a)
True
b)
False
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