5 Points All Directions Are Followed and Correct Answer

CH 6Test

Directions: Remember to show original formula, all work, box answers, proper units, proper significant digits, and proper scientific notation. Each answer (not each numerical question) is worth five points.

5 points all directions are followed and correct answer.

4 points not all directions are followed with correct answer

3 points all directions are followed, proper formula use but ending with incorrect answer.

2 points all directions are followed, correct/incorrect formula, attempt to solve problem,

and answer is incorrect.

1 point only correct formula written.

1.  A 425kg piano slides 4.2 m down a 32 degree incline and is kept from accelerating by a man pushing back on it parallel to the incline. The effective coefficient of kinetic friction is 0.38. (a) calculate the work done by gravity (b) calculate the work done by friction (c) calculate the net work.

2.  At an accident scene on a level road, investigators measure a car’s skid mark to be 94m long. The coefficient of kinetic friction is 0.45. Determine the speed of the car when the driver applied the brakes.

3.  A novice skier starting from rest, slides down a frictionless 42.0 degree incline whose vertical height is 178m. How fast is she going when she reaches the bottom?

4.  A shot putter accelerates a 8.4kg shot from rest to 13.5m/s. If the motion takes 1.4 seconds, what average power was developed?

5.  A ski starts from rest and slides down a 28 degree incline 85m long. (a) If the coefficient of friction is .0890, what is the ski’s speed at the base? (b) How far did it move on after the bottom of the hill?

Short Answer Questions – Select two of the following short answers.

1 point for basic definition

2 points basic definition using appropriate supporting terms which are defined

3 points explanation of main idea includes definition of supporting terms with examples

of their relationship to each other

4 points explanation of main idea that includes definition of supporting terms with examples

of their relationship to each other and application

5 points explanation of main idea that includes definition of supporting terms with examples

of their relationship to each other application, and an outside connection

A.  Describe the relationship of work to energy.

B.  Explain the relationship of power and work.