Physics 101

Chapter 2 Lecture Slides
Chapter 3 Lecture Slides
problem set 2

4.50. An athlete whose mass is 90.0 kg is performing weight-lifting exercises. Starting from the rest position, he lifts, with constant acceleration, a barbell that weighs 490 N. He lifts the barbell a distance of 0.60 m in 1.6 s.
a.) Draw a clearly labeled free-body diagram for the barbell and for the athlete.
b.) Use the diagrams in part (a) and Newton's laws to find the total force that his feet exert on the ground as he lifts the barbell.

4.52. A student tries to raise a chain consisting of three identical links. Each link has a mass of 300 g. The three-piece chain is connected to a string and then suspended vertically, with the student holding the upper end of the string and pulling upward. Because of the student's pull, an upward force of 12 N is applied to the chain by the string.
a.) Draw a free-body diagram for EACH of the links in the chain and also for the entire chain considered as a single body.
b.) Use the results of part (a) and Newton's laws to find (i) the acceleration of the chain; and (ii) the force exerted by the top link on the middle link.

LONG EXAM 1 IN PHYSICS 101
BRING THE FOLLOWING:
- BLUEBOOKS
- SCIENTIFIC CALCULATORS

REMINDERS:
-please review on circular motion and frictional forces
-solve problems also (this will help you)