PHYSICS NAME:

CHAPTER 2 TEST DATE:

KINEMATIC EQUATIONS

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.

PROBLEMS:

  1. A person jogs eight complete laps around a 400.0m track in a total time of 12.5 minutes. Calculate (a) the average speed (b) the average velocity in m/s
  2. A sports car accelerates from rest to 95km/h in 6.2s. What is its average acceleration in m/s2?
  3. A car slows down uniform from a speed of 21.0m/s to rest in 6.00s. How far did it travel in that time?
  4. Determine the stopping distance for a car with an initial speed of 95km/h and a human reaction time of 1.0s, for an acceleration of negative 4.0m/s2.
  5. A ballplayer catches a ball 3.0s after throwing it vertically upward. (a) With what speed did he throw the ball? (b) How high did it go?
  6. A stone is thrown vertically upward with a speed of 18.0m/s. (a) how fast is it moving when it reaches a height of 11.0m? (b) How long is it required to reach this height?

GRAPHS: Directions – for the following situations draw a (a) position time graph (b) velocity time graph (c) acceleration time graph. 1pt for each correct graph

  1. negative velocity negative acceleration
  2. positive velocity positive acceleration

Short Answers

Short Answer Questions –

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

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

and application

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

application, and an outside connection

  1. Why is it important to create a frame of reference for describing motion.
  2. How can acceleration due to gravity be a constant value?

FORMULAS:

x = x – xoy = yo+ vot+ 1/2at2

avg v = x-xo/t-tox = xo+ vot+ 1/2at2

avg a = v –vo/ t – tov2= vo2 + 2ax

v = vo+ atavg v = v + vo/ 2