3. Calculate the PE of a 2 kg cat perched 10 meters above the ground.
20 J
200 J
2.04 J
200 W
2. Multiple Choice
45 seconds
1 pt
4. In science, work is defined as this:
Product of force exerted perpendicular and displacement.
Product of force exerted parallel and displacement.
Product of force exerted in any direction and displacement.
3. Multiple Choice
45 seconds
1 pt
5. ∆ in PE = mghf- mg__ Name the missing variable.
Final Velocity
Initial Height
Initial Velocity
Final Height
4. Multiple Choice
2 minutes
1 pt
A 1 kg rock falls 20 meters, how fast is the rock going just before it hits the ground?
14.0 m/s
20.0 m/s
10.0 m/s
9.89 m/s
5. Multiple Choice
1 minute
1 pt
2 balls of equal mass roll down opposite sides from the top of a frictionless hill. Regardless of the path they take, what will the velocity of the balls be when they hit the ground?
Same
Different
Not enough information
6. Multiple Choice
1 minute
1 pt
9. Sue raises a stack of books 2 meters using a force of 20N. Calculate work.
392 J
392 W
40 J
40 W
7. Multiple Choice
1 minute
1 pt
Mechanical energy is equal to the sum of Kinetic energy and _________ energy
Thermal
Potential
Electrical
Chemical
8. Multiple Choice
1 minute
1 pt
11. Thermal energy is a type of mechanical energy.
True
False
9. Multiple Choice
1 minute
1 pt
Calculate the work needed to raise a 3 kg cat up to a height of 4 meters.
12 J
0 J
120 J
1.22 J
10. Multiple Choice
2 minutes
1 pt
When my velocity triples, my kinetic energy increases by ______ times.
9
3
1.5
4.5
11. Multiple Choice
2 minutes
1 pt
Calculate the Kinetic Energy (KE) of a girl whose mass is 50 kg and who is moving at 4 m/s.
200 J
800 J
400 J
100 J
12. Multiple Choice
2 minutes
1 pt
Sue lowers a stack of books using a force of 20 N over a distance of 2 meters. Calculate work.
20 J
-40 J
40 J
-20 J
13. Multiple Choice
2 minutes
1 pt
Sue lowers a stack of books with a mass of 20 kg over a distance of 2 meters. Calculate work.
400 J
-40 J
-400 J
-20 J
14. Multiple Choice
1 minute
1 pt
If height above the ground increases 4 times, how much does your potential energy (PE) change?
16 times
4 times
2 times
No change
15. Multiple Choice
1 minute
1 pt
The change in KE or change in PE is equal to Work.