1 AP Physics Newton's Laws Practice Test Answers: A,D,C,D,C,E,D ...

AP Physics Newton's Laws Practice TestAnswers: A,D,C,D,C,E,D,B,A,B,C,C,A,A 15. (b) both are 2.8 m/s 2 (c) 22.4 N (d) 1 s, 2.8 m/s 16. (a)12.5 N, 3.54 m/s 2 (b) 5.3 kg_____1. Two blocks are pushed along a horizontal frictionless surface by a force of 20 N to the right,as shown above. The force that the 2-kilogram block exerts on the 3-kilogram block isA. 8 N to the leftB. 8 N to the rightC. 10 N to the leftD. 12 N to the rightE. 20 N to the left_____2. An elevator is pulled up by a cable with a force of 65,000 N. The upward acceleration of theelevator is 1.8 m/s/s. What is the mass of the elevator?A. 1.8 kg.B. 1700 kg.C. 54880 kg.D. 5600 kg.E. 36111 kg.A ball is thrown and follows a parabolic path, as shown above. Air friction is negligible. Point Q is thehighest point on the path._____3. Which of the following best indicates the direction of the acceleration, if any, of the ball atpoint Q ?(A) (B) (C) (D)(E) There is no acceleration of the ball at point Q._____4. Which of the following best indicates the direction of the net force on the ball at point P ?(A) (B) (C) (D) (E)_____5. If F 1 is the magnitude of the force exerted by the Earth on a satellite in orbit about the Earthand F 2 is the magnitude of the force exerted by the satellite on the Earth, then which of thefollowing is true?(A) F 1 is much greater than F 2 . (B) F 1 is slightly greater than F 2 .(C) F 1 is equal to F 2 . (D) F 2 is slightly greater than F 1(E) F 2 is much greater than F 11

_____10. A block of mass 5 kilograms lies on an inclined plane, as shown above. The horizontal andvertical supports for the plane have lengths of 4 meters and 3 meters, respectively. The coefficientof kinetic friction between the plane and the block is 0.3. The magnitude of the force F necessary topull the block up the plane with constant speed is most nearly(A) 30 N (B) 41 N (C) 49 N(D) 50 N (E) 58 N____11. You are driving down the road when a fruitfly gets splattered on your windshield. Which ofthe following is correct?A. The fruitfly experienced a greater force than the windshield.B. The windshield experienced a greater force than the fruitfly.C. Each experienced the same force.D. Each experienced the same acceleration.E. Both A and D.F. Both C and D._____12. What is the acceleration of a block on a ramp inclined 35 o to the horizontal if µk = 0.4?A. 3.5 m/s 2 .B. 0.9 m/s 2 .C. 2.4 m/s 2 .D. 9.8 m/s 2 .E. not enough information given._____13. Solve for the mass of block M2 below. The pulley is frictionless. M1 = 6 kg, and M2accelerates upward at 2.9 m/s/s.A. 3.2 kg .B. 4.8 kg .C. 6.6 kg.D. 9.8 kg.E. 11.0 kg.M1 M2_____14. Solve for the tension in the rope in Figure 1.A. 41.4 N.B. 28.5 N.C. 76.2 N.D. 58.6 N.E. 107.8 N3

15. (8 Points) Answer the following questions for the two block system shown below. The horizontalsurface is frictionless. M1 = 8 kg, M2 = 3.2 kg, and h = 1.4 m.M1M2h(a) Draw free body diagrams of M1 and M2 below. Draw and label all the forces acting on them andindicate your coordinate systems.(b) The system is released from rest. Determine the accelerations of block M1 and block M2.(c) Determine the tension in the string connecting block M1 to block M2.(d) Determine the time it takes M2 to hit the floor and the speed it has just before hitting the floor.4

16. (10 Points) Block m 1 in the figure below has a mass of 6 kg and m 2 has a mass of 1.4 kg. Thecoefficient of kinetic friction between m 2 and the horizontal surface is 0.55. The inclined plane isfrictionless.m 2m 1! = 35 o(a) Find the tension in the cord and the acceleration of m 1 .(b) If the coefficient of static friction is 0.65, what is the minimum mass of block m 2 that wouldprevent the system from moving.5