Work, Energy, & Power Review
Presentation
•
Physics, Science, Mathematics
•
8th - 12th Grade
•
Medium
+2
Standards-aligned
Melvin Marriner
Used 209+ times
FREE Resource
4 Slides • 11 Questions
1
2
Work is the transfer of energy that results in an object's movement.
- W = Fd or W = Fdcos(θ)
- F is the force applied
- d is the distance traveled
- θ is the angle the force makes with the distance traveled.
3
Multiple Choice
How do we calculate work?
W = F * d
w = f * D
W = F * D
w = f * d
4
Multiple Choice
5
Multiple Choice
50 J of work is done lifting a 2.0 kg book in the air. How high was it lifted?
2.6 m
3.6 m
1.0 m
25 m
6
Fill in the Blanks
If you exert a 10 N force to lift a box 5 m, how many Joules of work do you do?
(Number only)
Type answer...
7
Energy is often defined as the ability to do work
It is measured in Joules
Kinetic Energy (KE) = (1/2)mv2
Potential Energy (GPE) = mgh
Remember! g = 9.81 m/s2
8
Multiple Choice
What is the potential energy of a 3kg ball that is on the ground?
0 J
3 J
9.8 J
29.4 J
9
Multiple Choice
A 3.0 kg ball is on a table 1.5 m above the ground. What is its gravitational potential energy?
4.5 J
44.1 J
3.4 J
29.4 J
10
Multiple Choice
What is the kinetic energy of a 12 kg dog running at 3 m/s?
36 J
353 J
54 J
118 J
11
Power is the rate of work done
P = W / t
Power is measured in Watts (W)
1 Watt = 1 Joule/second
1 horsepower (HP) = 745.7 watts
12
Multiple Choice
How do you calculate power?
P = W / t
P = E / t
P = w * t
P = t / W
13
Multiple Choice
A 100 N force is applied to move an object a horizontal distance of 5 meters at constant speed in 10 seconds. How much power is done?
50J
50W
500J
500W
14
Fill in the Blanks
If you exert 500 N to climb 5 m up a flight of steps in 10 seconds, how many watts of power did you exert?
(number only)
Type answer...
15
Multiple Choice
How much energy is used by a 100 W light bulb over 1 hour? (be sure to convert to seconds first)
100 J
36,000 J
360,000 J
240,000 J
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