HP 6-3: Work, Energy, Power Review
Presentation
•
Physics
•
9th - 12th Grade
•
Medium
+3
Standards-aligned
g Custer
Used 23+ times
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4 Slides • 15 Questions
1
By g Custer
2
Energy is often defined as the ability to do work
It is measured in Joules
Potential Energy (GPE) = mgh
Remember! g = 9.81 m/s2
or 10 m/s2
3
Multiple Choice
4
Multiple Choice
5
Multiple Choice
6
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
7
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
8
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.
9
Multiple Choice
How do we calculate work?
W = F * d
w = f * D
W = F * D
w = f * d
10
Multiple Choice
Newtons
11
Multiple Choice
12
Multiple Choice
13
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
14
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
15
Multiple Choice
How do you calculate power?
P = W / t
P = E / t
P = w * t
P = t / W
16
Multiple Choice
17
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
18
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
19
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?
5,000 W
50 W
500 W
50,000 W
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