A.P. Physics
Worksheet – Force (b)
Name _______________________
Date ___________
Read all questions carefully. Organize and show work for full credit. Circle answers.
Worksheet is due _____________________.
1.)
A 95.0-kg person stands on a scale in an elevator. What is the apparent weight when the elevator is (a)
accelerating upward with an acceleration of 1.80 m/s2, (b) moving upward at a constant speed, (c)
accelerating downward with an acceleration of 1.30 m/s2., and (d) moving downward at a constant speed?
2.)
A women stands on a scale in a moving elevator. Her mass is 60.0 kg, and the combined mass of the
elevator and scale is an additional 815 kg. Starting from rest, the elevator accelerates upward. During the
acceleration, there is a tension of 9410 N in the hoisting cable. (a) What is the acceleration of the elevator?
(b) What is the reading on the scale during the acceleration? (c) Assuming the elevator starts from rest,
how fast is it traveling at the end of 3.00 s?
3.)
(a) Compute the acceleration of the 1.3 x 103 N weight. Neglect friction and the mass of the rope and
pulley. (b) Now remove the 1.8 x 103 N weight, replace it by a constant downward tug of 1.8 x 103 N
acting on the end of the rope, and recalculate the acceleration of the first weight.
1300 N 1800 N
4.)
The figure shows three masses attached via massless ropes over weightless, frictionless pulleys on a
frictionless surface. Compute (a) the tension in the ropes and (b) the acceleration of the system. Draw all
appropriate free-body diagrams.
m2 = 2 kg
m3 = 2 kg
m1 = 4 kg