1. A block of mass m = 5kg is pulled up a = 20 incline with wire with a tension of 30N and force of friction of 4.6N. What is the net force?

2. A contestant in a winter sporting event pushes on a 45kg block of ice on a frozen lake as shown below. Assuming he applies a force of 56.32N calculate the Normal Force, but does not make the block move.

250 F (a) Figure 5.23 Which method of sliding a block of ice requires less force-(a) pushing or (b) pulling at the same angle above the horizontal