a.
State which law is being demonstrated in the example:
The car slows down more rapidly as the driver presses the brakes more.
b. The man pulls up on the box, and the box pulls down on the man.
The stationary book remains at rest.
C.
State one action reaction pair in the picture.
Action –
Reaction –
An elevator starts on the first floor of a building and moves to the second floor. A 70 kg person
is standing on a scale during the motion. Remember units for your answers.
What is the weight or force of gravity of the person? Show work.
a.
b. When the elevator is at rest, what does the scale read?
70kg
C.
The scale reads 800 N when the elevator starts moving up. What is the acceleration of
the elevator? Draw a FBD and show work.
FBD-
d. The elevator moves at a constant velocity between floors. What does the scale read?
70kg
e.
As the elevator reaches the second floor it accelerates at -0.5 m/s2. What does the scale
read? Draw a FBD and show work.
FBD-
2. For each situation: a) Draw and label a free body diagram of the ball. b) Determine if the forces
are balanced or unbalanced. c) Describe the motion and direction of the ball.
i.
The ball starts from rest and is pushed to the right by the broom on a frictionless surface.
a. labeled FBD
b. Balanced or Unbalanced
C. Describe the motion of the ball including direction
ii. The ball is rolling to the right on a frictionless surface and not being touched by the broom.
(No touch zone)
a. labeled FBD
b. Balanced or Unbalanced
c. Describe the motion of the ball including direction
iii. The ball is moving to the right on a rough surface with friction.
a. labeled FBD
b. Balanced or Unbalanced
C. Describe the motion of the ball including direction
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