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Lab 9 extra credit 1. The correct SI unit for momentum is a) J.s b) watts c) kg.m/s d) kg2m/$2 2. A 1.0 kg-ball moving at 2.0 m/s perpendicular to a wall rebounds from the wall at 1.5 m/s. The change in the momentum of the ball is: a) zero c) 0.5 N . s toward wall b) 0.5 N . s away from wall d) 3.5 N . s away from wall 3. An object's angular momentum is proportional to its a) Mass. c) Kinetic energy. b) Moment of inertia. d) Linear momentum. 4. A light plastic cart and a heavy steel cart are both pushed with the same force for 1.0 s, starting from rest. Aft the force is removed, the momentum of the light plastic cart is F that of the heavy steel cart. a) Greater than b) Equal to c) Less than d) Can't say. It depends on how big the force is. 5. The two boxes are sliding along a frictionless surface. They collide and stick together. Afterward, the velocit of the two boxes is a) 2 m/s to the left b) 1 m/s to the left 4 m/s 2 m/s 2 kg C) 0 m/s, at rest 1 kg d) 1 m/s to the right e ) 2 m/s to the right 6. What is the direction of the angular momentum vector for a wheel spinning as shown below? a) Upward b) Downward C ) Clockwise d) Counterclockwise e) Angular momentum is not a vector