Worksheet for test 2 Refer to lecture powerpoint files *Week 4 (second half on force) *Week 5-7 work, energy, rotation *Week 89 torque, matter & atoms PART A 1. 2. FORCE The SI unit Newton is represented by what SI units? One Newton of force is about how many pounds of force? . What are the different ways forces can be classified? Give examples A What is meant by the \"net force\"? and why is it important? . If given a few forces acting on an object, explain how you would determine the net force? NEWTON'S LAWS OF MOTION . Describe in your own words Newton's three laws of motion . Give an example illustrating Newton's rst law A a. Newton's second law says that if the net force acting on an object is zero, then the resulting acceleration will be (zero, constant, steadily increasing, steadily decreasing) b. Newton's second law says that if the net force acting on an object is constant, then the resulting acceleration will be (zero, constant, steadily increasing, steadily decreasing) c. if the net force acting on an object is tripled, how will this affect the acceleration? d. Newton's second law says that if the net force acting on an object is steadily decreasing, then the resulting acceleration will be (zero, constant, steadily increasing, steadily decreasing) . a. Consider a 10 kg block initially at rest on a horizontal frictionless surface. It is pushed with a force of 20 N to the right. Q: Sketch the problem Q: What is the net force in the vertical direction? Q: What is the net force in the horizontal direction? {\\A 1YTI._A. 1.. 41... ._._'._1I .. -a. 13-..-..0