Warm-Up Exercise for lecture 14

Due 8:00 am, Thurs, 15 Oct 2009

Physics 105, Fall 2009

In order to apply the most torque to a screw, you should:
use a wrench with a long handle
use a wrench with a short handle
there would be no difference

Two people sit on a seesaw. They sit in positions such that the seesaw is balanced in a horizontal position. True/False: The two people must weigh the same amount.
true
false

If an object is in equilibrium:
the net force on it must be zero
the net torque on it must be zero
both of the above
neither of the above

Ralph noticed that both torque and work are obtained by multiplying a force times a distance. He wants to know: how are they different? Do they have the same units? What can you tell Ralph to help him out?