1.A 55 kg motorcyclist is flying through the air at 72 km/h at the apex of the jump 8.3 m above the ground. Find his landing speed assuming energy is conserved.

2.What would happen to the potential energy, kinetic energy and total energy of a brick as it falls to earth, if dropped from a building?

3.Describe/list the formulas you would use to find the acceleration of a 10 kg cart that is pushed a distance of 10 m with 300 J of energy. Use GRASP to determine the formulas you would require

4.What is the relationship between power and energy? Describe an example of where power (and efficiency) calculations are important in society.

5.A 20.0 kg block is being pushed forward on a flat surface with a force of magnitude 45.0 N against a frictional force of 13.0 N.

(a) Draw a free-body diagram of the block.

(b) What is the net force acting on the block?

(c) What is the change in kinetic energy after the force has

pushed the block for 4.0 m?

(d) How much work would it take to stop the block?

6.A 100 kg roller coaster is moving at 10 m/s while travelling 30 m above the ground. How fast will it be travelling when it reaches ground height?

7.A boy pushes on a car to slow it down while the car is rolling horizontally down the road. If the boy pushes backwards on the car with 10 N of force as the car rolls forward 3.0 m, the amount of work done by the boy is:

1. -30 J
2. 3.3 J
3. 300 J
4. 0
5. 30 N. M

8. What is the speed of a 5.0 kg ball if its kinetic energy is 40 J?

1. 4 m/s
2. 200 km/h
3. 8m/s
4. 16 m/s
5. 2.8 m/s

9. A 300 N force is applied horizontally to a 50 kg crate, originally at rest, pushing it 2 m. The force of friction between the crate and the floor is 200 N. The final kinetic energy of the crate is:

1. 0 J
2. 300 000 J
3. 400 J
4. 600 J
5. 200 J

10. If a 1000 kg car accelerates from 10 m/s to 20 m/s, the amount of work done is:

1. 10 000 J
2. 150 000 J
3. 112 500 J
4. 5000 J
5. 0 J

11. If mechanical energy is conserved, then

1. The amount of kinetic energy is constant
2. The sum of the kinetic energy and gravitational potential energy remains constant
3. None of the above
4. The amount of gravitational potential energy is constant
5. Thermal energy losses due to friction are constant

12. The amount of energy required to raise a 20 kg child onto a countertop that is 1.25 m off the ground is:

1. 0 J
2. 0.25 N
3. 30 J
4. 30 N
5. 245 J

13.A cyclist on a bike has 4 100 J of energy. If the bicycle and cyclist weigh 82 kg the velocity of the cyclist is:

1. 100 m/s
2. 100 km/h
3. 50 km/h
4. 0m/s
5. 10 m/s

14. A person pushes a 15 kg lawn mower 10 m with 300 N of force. The lawn mower is pushed at an angle of 45 degrees to the ground. How much work has been done?

1. 876 J
2. 2121 J
3. 3987 J
4. 6777 J

15. Work is equal to..

1. The change in energy in a system
2. The total energy in a system
3. The type of energy in a system
4. Work and energy are not related