Name ______Per. _____

Ch 11 Section Reviews

Section 1

  1. Explain the relationship between motion and frame of reference.
  1. Identify the following measurements as speed or velocity.

Name ______Per. _____

Ch 11 Section Reviews

  1. 88 km/h ______
  2. 9 m/s to the west______
  3. 18 m/s down______
  4. 10 m/s______

Name ______Per. _____

Ch 11 Section Reviews

  1. What two measurements are necessary to find the average speed of a highschool track athlete?

______& ______

  1. Determine the unit of a caterpillars’ speed if you measure the distance in centimeters (cm) and the time it takes to travel that distance in minutes (min) speed = ______On a graph, on what axis would you put the distance (x- horizontal or y -vertical)? ______
  1. Imagine that you could ride a baseball that is hit hard enough for a home run. If the baseball is your frame of reference what does earth appear to do? ______
  1. How much time does it take for a student running at 5.00 m/s to cover a distance of 2.00 km? (Hint: change kilometers to meters)

Section 2

  1. Explain why circular motion includes continuous acceleration even when the speed does not change.
  1. Identify the straight line accelerations below as either speeding up or slowing down.

Name ______Per. _____

Ch 11 Section Reviews

  1. 5.7 m/s2______
  2. -29.8 m/s2______
  3. -2.43 m/s2 ______
  4. 9.8 m/s2 ______

Name ______Per. _____

Ch 11 Section Reviews

  1. Graph the velocity vs. time from 0 s to 10 s of a car that accelerates from a standstill at a constant rate of 1.5m/s2.
  1. Joshua skates a straight line at a constant speed for 1 minute, then begins going in a circle at the same rate of speed, and finally begins to increase speed. When is he accelerating? ______Explain your answer.
  1. What is the final speed of a skater that accelerates at a rate of2.0 m/s2 from rest for 3.5 seconds?
  1. Graph the velocity of a car accelerating at a uniform rate from 7.0 m/s to 12.0 m/s in 2.0 s. Calculate the acceleration.

Section 3

  1. List the 4 fundamental forces of nature. ______, ______, ______, ______
  1. Describe a situation in which unbalanced are acting on an object. ______What is the netforce of the object______, and how does the net force change the motion of the object?______
  1. Identify the type of friction described in each situation below.
  1. Two students are pushing a box that is at rest.______
  2. The box pushed by the students is now sliding. ______
  3. The students put rollers under the box and push it forward. ______
  1. Explain why driving on a road requires friction. ______How could you increase friction on an icy road?______
  1. Describe three ways to decrease the force of friction between two surfaces that are moving past each other.
  2. .
  3. .
  4. .
  5. When you wrap a sandwich in plastic food wrap to protect it, you must first remove the plastic wrap from the container and then wrap the plastic around the sandwich. In both steps you encounter friction. In each step, is friction helpful or not? ______Explain your answer.
  1. The force pulling a truck down hill is 2,000 N. What is the amount of static friction acting on the truck if the truck does not move?