Chapter 4 Test

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 person pulls a 42kg lawn roller at a constant speed with a force of 145N directed along a handle that makes an angle of 38 degrees to the horizontal. (a) Find the frictional force exerted on the roller. (b) The normal force exerted on the roller. (c) Determine the coefficient of friction.
  2. A .14kg baseball traveling at 95km/h strikes the catcher’s mitt and comes to rest as the glove recoils backwards for a distance of 13cm. What was the average force applied by the ball on the glove?
  3. How much tension must a rope withstand if it used to accelerate a 898kg car horizontally along a frictionless surface at 2.50m/s2?
  4. The cable supporting a 3525kg elevator has a maximum strength of 33,625N. What maximum upward acceleration can it give the elevator without breaking?
  5. What is the maximum acceleration a car can undergo if the coefficient of friction between the tire and the ground is 0.65?
  6. A 19.0kg box is released on a 36 degree incline and accelerates down the incline at 0.42m/s2. (a) Find the friction force impeding its motion. (b) What is the coefficient of kinetic friction?

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

  1. How do Newton’s three laws of motion describe the interaction of forces that cause an object to move?
  1. Explain the relationship of forces acting on an object for the variety of situations discussed in class.