Introductory Physics Worksheet With Answers - Mcas Review Packet #1 - Nnhs Page 19
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NNHS Introductory Physics: MCAS Review
Packet #1
Practice: Open-response question #1
BE SURE TO ANSWER AND LABEL ALL PARTS OF THE QUESTION.
Show all your work (diagrams, tables, or computations)
If you do the work in your head, explain in writing how you did the work.
An elastic cord made for bungee jumping is being tested. A block weighing 800 N is attached to
one end of the bungee cord. Then the block is released from a tall tower and it moves downward.
When the elastic cord is fully extended, it exerts an opposing force of 900 N on the block.
a. Draw and label a force diagram for this situation.
b. Calculate the net force on the block. Show your calculations and include units in your answer.
c. Explain what would happen if the elastic cord exerted a maximum force of only 700 N on the
block.
Answer:
A.) This force diagram shows the forces at the moment the cord is fully
extended.
F
=900 N
tension
F
=800 N
gravity
B.) I am calculating the net force on the block at the moment the cord is
fully extended.
F
= F
– F
= 900 N – 800 N = 100 N
net
up
down
C.) If the cord exerted a maximum force of only 700 N, it would never pull
up with enough force to cancel out the weight of the block. The net
force would always be downward. The block would continually accelerate
downward until it hits the ground.
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