advertisement

Name: _____________________________ Period: _____ Pre-AP Physics Rotational Motion Test Review Use this review to help you study for your Unit 1 Test. In addition to this review, you should study your notes and homework for this unit. 1. Fill out the chart with the correct rotational version with right units Quantity Linear Rotational Displacement x or s (m) Inertia Mass (kg) F = ma Force F (N) K = ½mv2 Velocity v ( m/s ) Work = Fx Acceleration a ( m/s2 ) Power = Fv Momentum mv (kg m/s) Linear Motion Rotational Motion Fx = ΔK 2. For a rolling object to not slip what must be true of their linear and rotational velocities. 3. A hoop of 3 m radius rolls without slipping on a flat surface. The center of the wheel advances at constant velocity, moving a distance of 15 m in 3 s. What is angular speed of the wheel? 4. A bicyclist starts from rest and accelerates at 2 rad/sec2. In 10 seconds what is the angular displacement of the bike wheels? Page 1 of 4 Pre-AP Physics angular Motion Test Review 5. A bike wheel with mass 1.5 kg and 63 cm radius accelerates uniformly from rest to a speed of 15 rad/s in 5s. Determine the net torque acting on the bike wheel. 6. What is the net torque? 7. For an object to be in equilibrium what two conditions need to be met? 8. John wants to move a 400 N rock with 69 cm crowbar. He puts the fulcrum 9 cm from the rock. How much force must he use to move the rock? Page 2 of 3 Pre-AP Physics angular Motion Test Review 9. A 759 N window washer is standing on a scaffold supported by a vertical rope at each end. The scaffold weighs 254 N and is 3.50 m long. Assume the window washer stands 1.3 m from the left end. a. What is the tension in the rope on the right (hint: make the left rope the pivot point for torque)? b. What is the tension in the rope on the left? 10. A 2.5 kg solid disk of radius .5m and rotational inertia of .3125 kg m2 rolls down the hill. It has initial velocity equal to zero and the hill is 18.3 m high. What is the velocity v of the disk at the bottom of the hill? Ignore friction. 11. A diver can reduce her rotational inertia when changing from the straight position to the tuck positions. Her inertia when in the straight position is 9 kg m2 and 3 kg m2 when in the tucked. She rotates at 2.3 rad/s when in the straight position. a. What is her angular speed (rad/s) when in the tucked position? b. What is the kinetic energy of the diver in both positions? c. How much work did the diver have to do to change positions? Page 3 of 3