
Conservation of Mechanical Energy
Presentation
•
Physics
•
11th Grade
•
Easy
+2
Standards-aligned
Lauren Morriss
Used 17+ times
FREE Resource
12 Slides • 19 Questions
1
Mechanical Energy
physical science

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4
Mechanical Energy of an ISOLATED System
the TOTAL ENERGY never changes!!!
in the picture, total (mechanical) energy is equal to 50,000 Joules
KE + PE HAS TO EQUAL 50,000 Joules
look at each point: KE + PE = 50,000 J every time!
5
Multiple Choice
6
7
Multiple Choice
A skydiver jumps from a plane and is halfway through her descent. At this point in time she has:
Kinetic Energy
Gravitational Potential Energy
Both Kinetic and Gravitational Potential Energy
She has no energy
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10
11
Multiple Choice
An object has 300 J of total mechanical energy and 208 J of KE. How much PE does it have?
12
Multiple Choice
13
Multiple Choice
A car with a total mechanical energy of 2,500 J is measured to have 575 J of PE. How much KE does the car have at the same point?
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15
**disclaimer: I KNOW the apple story might not be true, but everyone has heard about it, so...
16
Multiple Choice
Energy stored by objects due to their position above Earth’s surface.
potential energy
kinetic energy
gravitational potential energy
mechanical energy
17
Multiple Choice
What is the unit of measurement for potential energy?
Watts
Joules
Newtons
Meters
18
Multiple Choice
I have the most potential energy if I am:
5 feet high
10 feet high
15 feet high
20 feet high
19
Multiple Choice
20
Multiple Choice
Which has more gravitational potential energy?
A 0.25 kg apple sitting on a countertop 1 meters off the ground
A 1000 kg car sitting the driveway on the ground.
They have the same gravitational potential energy
21
Multiple Choice
Acceleration due to gravity (g) on Jupiter is 24.79 m/s2. If a 5 kg box is 32 m above the surface of Jupiter, calculate the GPE of the box.
22
Multiple Choice
If you know an object's potential energy, what operation can you use to solve for height?
h = mg
h = PE / (mg)
h = mg / (PE)
h = PE(mg)
23
Multiple Choice
A golf ball has a mass of 0.046 kg. It is dropped and has 1.1 J of gravitational potential energy (gravity = 9.8 m/s2). What height was it dropped from?
2.4 meters
234 meters
0.41 meters
There isn't enough information to determine the height.
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25
Multiple Choice
26
Multiple Choice
A bicycle and a person with a total mass of 80 kg are traveling at a velocity of 7 m/s. What is their kinetic energy?
156,800 J
1,960 J
0.82 J
7,840 J
27
Multiple Choice
What is the kinetic energy of a 4kg shotput thrown with a velocity of 13m/s?
676 J
3.25 J
17J
338 J
28
Multiple Choice
Which of the following has more kinetic energy?
A 1000 kg car moving at 10 m/s
A 4000 kg semi truck moving at 5 m/s
They have the same kinetic energy
29
Multiple Choice
If you know an object's kinetic energy, what operation would you use to solve for velocity?
v = KE(2m)
v = (2KE) / m
v = [2KE/m]^0.5
v = [KE(2m)]^0.5
30
Multiple Choice
What is the velocity of a ball with a mass of 5kg that has a kinetic energy of 250 J
5 m/s
7 m/s
10 m/s
50 m/s
31
Summary
Mechanical Energy
physical science

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