LAB 5: MORE ABOUT NEWTON'S LAWS: HOMEWORK

Please list the members of your group:

Questions 1–6 refer to a toy car that can move in either direction along a horizontal line (the + position axis). Note that the positive direction is toward the right.

Assume that friction is so small that it can be ignored. Choose the shape of the graph on the right (A-F) of the applied force that would keep the car moving as described in each statement. If none of the graphs is correct, choose G.

Question 1: The toy car moves toward the right with a constant velocity.

A.

Question 2: The toy car moves toward the left with a constant velocity.

B.

Question 3: The toy car moves toward the right with a steadily decreasing velocity (a constant acceleration).

C.

Question 4: The toy car moves toward the right, speeds up, and then slows down.

D.

Question 5: The toy car moves toward the left with a steadily increasing velocity (a constant acceleration).

E.

Question 6: The toy car is given a push toward the right and released. It continues to move with a constant velocity. Sketch the force after the car is released.

F.

Copyright © 2018 John Wiley & Sons, Inc.

LAB 5: MORE ABOUT NEWTON'S LAWS


Question 7: A cart is moving toward the right and speeding up at a steady rate, as shown in the diagram below. Imagine that arrows are drawn above the cart representing the magnitudes and directions of the net force on the cart at t = 0 s, t = 1 s, etc. Assume that the cart is already moving at .

  1. What is the direction of the force vector at t = 2 s? Explain.
  2. What is the sign of the force at t = 2 s? Explain.
  3. Compare the magnitude of the force vector at t = 2 s to that at t = 3 s. Explain.

LAB 5: MORE ABOUT NEWTON'S LAWS


Question 8: A cart is moving toward the right and slowing down at a steady rate , as shown in the diagram below. Imagine that arrows are drawn above the cart representing the magnitudes and directions of the net force on the cart at t = 0 s, t = 1 s, etc. Assume that the cart is moving at and .

  1. What is the direction of the force vector at t = 2 s? Explain.
  2. What is the sign of the force at t = 2 s? Explain.
  3. Compare the magnitude of the force vector at t = 2 s to that at t = 3 s. Explain.

LAB 5: MORE ABOUT NEWTON'S LAWS

Questions 9-10 refer to a toy car that can move in either direction along a horizontal line (the + position axis).


Assume that friction is so small that it can be ignored. A force toward the right of constant magnitude is applied to the car.

Question 9: Describe the acceleration of the car. Is it constant or changing in some way? What is its direction?

Question 10: Suppose that the mass of the car were twice as large. The same constant force is applied to the car. Describe any changes to the magnitude of the car’s acceleration. Explain.

LAB 5: MORE ABOUT NEWTON'S LAWS

Question 11: When a force is applied to an object with mass equal to 1.00 kg, the acceleration of the mass is 3.25. (Assume that friction is so small that it can be ignored.) When the same magnitude force is applied to another object, the acceleration is 2.75. What is the mass of this object? What would the second object’s acceleration be if a force twice as large were applied to it? show your calculations.

ALL DONE!

Please remember to edit the report (insert your name - and if necessary your partners), export the report and submit it on D2L.


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