A rock climber climbs up a rock face, as shown in the diagram below.

a. To climb the rock face, the climber must do work. Which one of the following forces must the climber work against as he climbs?

air resistance; friction on the rock; his weight; tension in the safety rope

b. What other quantity, as well as the force ticked in a must be known in order to find the work done by the climber?

c. One climber weighs 1000 N and another weighs 800 N. They both take the same time to climb the cliff.

i. Which one has done the most work?

ii. Which one has the greater power rating?

d. When the first climber reaches the top, he has more gravitational potential energy than he had at the bottom.

i. What fonn of energy, stored in his body, was used to give him this extra gravitational potential energy?

ii Where did he get this energy from?

iii. Other than increasing gravitational potential energy on the way up, how else was energy in his body used? State one way.

Transcribed Image Text:

safey rope climber