1. Can an object be in mechanical equilibrium when only a single force acts on it? Discuss. 2. Nellie Newton hangs at rest from the ends of the rope as shown. How does the reading on the scale compare...

1. Can an object be in mechanical equilibrium when only a single force acts on it? Discuss.

2. Nellie Newton hangs at rest from the ends of the rope as shown. How does the reading on the scale compare with her weight?

3. Two balls, A and B, are released simultaneously from rest at the left end of the equal-length tracks, as shown. Which ball will reach the end of its track first?