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WorksheetsWork Energy Power
Total questions: 30
Worksheet time: 12mins
Energy is...
a scalar.
a vector.
Power is...
a scalar.
a vector.
Work is...
a scalar.
a vector.
Kinetic Energy (KE) is...
a scalar.
a vector.
Gravitational Potential Energy (GPE) is...
a scalar.
a vector.
Kinetic Energy (KE) is equal to...
(1/2)mv2
mgh
|F||Δx|cosθ
W/t
Gravitational Potential Energy (GPE) is equal to...
(1/2)mv2
mgh
|F||Δx|cosθ
W/t
Elastic Potential Energy (Us) is equal to...
(1/2)kΔx2
mgh
|F||Δx|cosθ
W/t
Work is equal to...
(1/2)mv2
mgh
|F||Δx|cosθ
W/t
Select ALL answer choices that are statements of the law of conservation of energy.
TEi = TEf
Energy cannot be created or destroyed.
Potential energy is positive always.
Total energy is constant.
The work done by gravity on a car moving across a level road is equal to...
9.8 J
-9.8 J
0 J
-4.9 J
A 25 kg box is pushed along a rough surface for a distance of 2 m by a 350 N force. The coefficient of kinetic friction between the box and the surface is 0.3. Calculate the work done by the normal force on the box.
700 J
- 210 J
0 J
- 147 J
The work done by friction is always negative because the frictional force points opposite to the displacement.
True
False
The work done by the normal force is always zero for an object moving along a surface because the angle between the normal force and the displacement is 90o.
True
False
Select all that apply! The kinetic energy of an object depends on...
mass
speed
height
angle
Select all that apply! The gravitational potential energy of an object depends on...
mass
speed
height
angle
If two vectors point in the same direction the angle between them is...
0o
90o
180o
30o
If two vectors point in opposite directions the angle between them is...
0o
90o
180o
30o
What is the value of little g?
0 m/s2
9.8 m/s2
6.67 x 10 -11 m3/kgs2
3 x 10 8 m/s
What are the SI units for energy?
Joules
kg m2/s2
Watts
N m
What are the SI units for work?
Joules
kg m2/s2
Watts
N m
What are the SI units for power?
Joules
Watts
Newtons
Coulombs
Calculate the power output of a machine that does 5.0 kJ of work over a time interval of 15 seconds.
0.33 W
2 W
200 W
330 W
Power is calculated as...
P = W / Δt
p = mv
EPE = (1/2) k x2
F = ma
Kinetic energy can be positive or zero, but never negative.
True
False
Potential energy can be positive or zero, but never negative.
True
False
Total energy can be positive or zero, but never negative.
True
False
A 25 kg box is pulled at an angle of 40o over a horizontal surface for a distance of 2.0 m by a 350 N force. Calculate the work done by the pulling force on the box.
240 J
300 J
540 J
100 J
The total mechanical energy of a cannonball that was shot horizontally from a cannon and is flying through the air can be written as...
(1/2)mv2 + mgh
(1/2)mv2
mgh
(1/2)kΔx2 + mgh
The total mechanical energy of an orange that fell out of a tree and is just about to make contact with the ground can be written as...
(1/2)mv2 + mgh
(1/2)mv2
mgh
(1/2)kΔx2 + mgh
