Download Learning Target #1: Distinguish between kinetic and potential

Unit 4 (Chapter 5) Remediation
Name: _________________________
Learning Target #1: Distinguish between kinetic and potential energy.
1. A roller coaster is at the top of a 52 m hill and weighs 831 N. The coaster (at this moment) has kinetic or
potential energy (circle one). Calculate it.
2. A car is traveling with a velocity of 40 m/s and has a mass of 1200 kg. The car has kinetic or potential
energy (circle one). Calculate it.
Learning Target #2: Calculate kinetic energy.
3. What is the kinetic energy of a 0.075-kg baseball traveling at a speed of 100 m/s?
4. What is the kinetic energy of a 0.5-kg rocket traveling 3.13 m/s thru the air?
Learning Target #3: Describe different forms of potential energy.
5. An object’s GPE can change in three situations; one way is changing its mass, name 2 other ways.
Learning Target #4: Calculate gravitational potential energy.
6. When a 5 N book is removed from a 10-m shelf and placed on a table 1-m off the ground, what is the
change in gravitational potential energy?
7. A boulder with a mass of 3,000 kg starts on a ledge 150 m above the ground. Calculate its GPE.
Learning Target #5: Describe how energy can be transformed from one form to another.
8. Describe how you will transfer energy during your thanksgiving meal on Thursday.
9. Draw a picture to show how a rubber band transforms energy when it is shot across a classroom,
starting with its elastic potential energy.
Learning Target #6: Explain how the mechanical energy of system is the sum of the potential and the kinetic
energies.
10. If mechanical energy is the sum of potential and kinetic energy of a system, calculate the GPE at its
highest point and the KE right before it hits the ground, as a 200-kg model airplane lands in a grassy field
after starting from 100m above the ground.
11. As you ride a bike down a hill, you apply the brakes to slow down. If the ME was 5000 J at the top of the
hill, and your PE is 3000 J at the bottom of the hill, how much energy was converted to thermal/heat as
your coasted down the hill?
Learning Target #7: Discuss the law of conservation of energy.
12. Since energy cannot be created or destroyed in normal processes, what happens to the total
(mechanical energy) of a roller coaster throughout a summer day?
Answers:
1. 43212 J
2. 960000 J
3. 375 J
4. 2.45 J
5. Increase height, decrease height
6. PE1 = 50 J; PE2 = 5 J
7. 4, 410,000 J
8. CPE  KE  CPE + thermal + KE
9. Elastic  GPE  Kinetic
10. 196000 J
11. X = 2000 J
12. Stays constant