Physics 213 Quiz 5 Forces III 7 pts each Oct. 22, 2005

One point absolutely free!

1. Compare the two tensions T1 & T2. That is, if they are the same, say so. If one tension is larger than the other, how much larger?

2.

3. The two blocks are pulled along on a friction free surface to the right . Compare the force exerted on M1 by rope # 1 with the force exerted on M2 by rope #2.

4. The 8 kg block slides on a friction free surface (hereafter referred to as ffs). At first the 8 kg block is held by someone’s hand. Does the tension in the rope change after release? If so, how?

5.

6. A 2 kg ball on a 3 m long string is rotated fast enough in a vertical circle so that the tension in the string at the top of the circle is 4 N. Find the angular speed of the ball at this instant in rpm’s.

7. A 1200 kg car rounds a curve at 30 m/s . The road surface is level, (not banked). The radius of the curve is 400 m. What is the friction force between the tires and the road? Is it a static friction force or a kinetic friction force?

10 Points Bonus!

What does each of the scales read in the picture below ? You can assume the scales are massless, but the pulleys each have a mass of 2 kg.