CHAPTER 2, Lsn 2-1 to 2-5 TEST REVIEW
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1 IB PHYSICS Name: DEVIL PHYSICS Period: Date: BADDEST CLASS ON CAMPUS CHAPTER 2, Lsn 2-1 to 2-5 TEST REVIE 1. The graph shows the variation with time t of the acceleration a of an object. hich of the following is the change in velocity of the object in the time interval 0 to 4 s? A. 8 m s 1 B. 4 m s 1 C. +4 m s 1 D. +8 m s 1 2. This question is about kinematics. Lucy stands on the edge of a vertical cliff and throws a stone vertically upwards. Chap 2A Test Sec 2-1 To 2-5 Test Review.Doc Page 1 of 9
2 The stone leaves her hand with a speed of 15 m s 1 at the instant her hand is 80 m above the surface of the sea. Air resistance is negligible and the acceleration of free fall is 10 m s 2. (a) (b) Calculate the maximum height reached by the stone as measured from the point where it is thrown. Determine the time for the stone to reach the surface of the sea after leaving Lucy s hand. 3. hich of the following quantities can be determined from a speed-time graph of a particle travelling in a straight line? A. Only the magnitude of the acceleration at a given instant B. Both the velocity and the acceleration at a given instant C. Only the distance travelled in a given time D. Both the distance travelled in a given time and the magnitude of the acceleration at a given instant 4. Samantha walks along a horizontal path in the direction shown. The curved part of the path is a semi-circle. (3) The magnitude of her displacement from point P to point Q is approximately A. 2 m. B. 4 m. C. 6 m. D. 8 m. 5. Two balls of different mass are dropped from the top of a tall building one after the other. The distance between the balls A. increases with time. B. depends on the initial velocity only. C. remains constant. D. depends on the mass of the balls. Chap 2A Test Sec 2-1 To 2-5 Test Review.Doc Page 2 of 9
3 6. The graph shows how the displacement d of an object varies with time t. The tangent to the curve at time t 1 is also shown. hich of the following gives the speed of the object at point P? A. the gradient at P B. the shaded area C. 1 gradient at P D. d1 t 1 7. The graph is a speed versus time graph for an object that is moving in a straight line. The distance travelled by the object during the first 4.0 seconds is A. 80 m. B. 40 m. C. 20 m. D. 5 m. Chap 2A Test Sec 2-1 To 2-5 Test Review.Doc Page 3 of 9
4 8. A ball, initially at rest, is dropped in the air from a great height. Air resistance is not negligible. hich of the following graphs best shows the variation with time t of the acceleration a of the ball? 9. A cart of mass M is on a horizontal frictionless table. The cart is connected to an object of weight via a pulley. hich of the following is the acceleration of the cart? M g A. B. M g Mg C. D. 0 Chap 2A Test Sec 2-1 To 2-5 Test Review.Doc Page 4 of 9
5 10. The graph shows how the velocity of a particle varies with time. hich of the following graphs correctly shows how the acceleration of the particle varies with time? 11. Stephen pushes two boxes P and Q, that stay in contact, along a rough table, with a force F of 30 N. Box P has a mass of 2.0 kg and box Q has a mass of 4.0 kg. Both boxes move with constant speed. The resultant force on box Q is A. 0 N. B. 5.0 N. C. 15 N. D. 30 N. Chap 2A Test Sec 2-1 To 2-5 Test Review.Doc Page 5 of 9
6 12. This question is about mechanics and thermal physics. The graph shows the variation with time t of the speed v of a ball of mass 0.50 kg, that has been released from rest above the Earth s surface. The force of air resistance is not negligible. Assume that the acceleration of free fall is g = 9.81 m s 2. (a) State, without any calculations, how the graph could be used to determine the distance fallen. (b) (i) In the space below, draw and label arrows to represent the forces on the ball at 2.0 s. (1) (ii) Use the graph opposite to show that the acceleration of the ball at 2.0 s is approximately 4 m s 2. (1) Chap 2A Test Sec 2-1 To 2-5 Test Review.Doc Page 6 of 9
7 (iii) Calculate the magnitude of the force of air resistance on the ball at 2.0 s. (iv) State and explain whether the air resistance on the ball at t = 5.0 s is smaller than, equal to or greater than the air resistance at t = 2.0 s. 13. A skydiver jumped out of an airplane. On reaching a terminal speed of 60 m s 1, she opened her parachute. hich of the following describes her motion after opening her parachute? A. She went upwards for a short time, before falling to Earth at a speed of 60 m s 1. B. She continued downwards at 60 m s 1, but hit the ground with less force. C. She continued to fall but reached a new terminal speed of less than 60 m s 1. D. She went upwards for a short time, before falling to Earth at a speed of less than 60 m s This question is about motion of a ball falling in oil. (a) (b) Distinguish between average speed and instantaneous speed. A small steel ball of mass M is dropped from rest into a long vertical tube that contains oil. The sketch graph shows how the speed v of the ball varies with time t. Chap 2A Test Sec 2-1 To 2-5 Test Review.Doc Page 7 of 9
8 (c) Explain how you would use the graph to find the average speed of the ball between t = 0 and t = t 1. The gradient of the graph at t = t 1 is k. Deduce an expression in terms of k, M and g, the acceleration of free fall, for the magnitude of the frictional force F acting on the ball at t = t 1. (d) State and explain the magnitude of the frictional force acting on the ball at t = t A lamp of weight is suspended by a wire fixed to the ceiling. ith reference to Newton s third law of motion, the force that is equal and opposite to is the A. tension in the wire. B. force applied by the ceiling. C. force exerted by the lamp on the Earth. D. force exerted by the Earth on the lamp. 16. This question is about force and energies. (a) (3) (3) (3) A system consists of a bicycle and cyclist travelling at a constant velocity along a horizontal road. (i) State the value of the net force acting on the cyclist. (1) Chap 2A Test Sec 2-1 To 2-5 Test Review.Doc Page 8 of 9
9 (c) (ii) (iii) On the diagram draw labeled arrows to represent the vertical forces acting on the bicycle. ith reference to the horizontal forces acting on the system, explain why the system is travelling at constant velocity. The cyclist stops pedalling and the system comes to rest. The total mass of the system is 70 kg. (i) (ii) (iii) Calculate the magnitude of the initial acceleration of the system. Estimate the distance taken by the system to come to rest from the time the cyclist stops pedalling. State and explain one reason why your answer to (c)(ii) is only an estimate. 17. Mandy stands on a weighing scale inside a lift (elevator) that accelerates vertically upwards as shown in the diagram below. The forces on Mandy are her weight and the reaction force from the scale R. The reading of the scale is A. R +. B.. C. R. D. R. Chap 2A Test Sec 2-1 To 2-5 Test Review.Doc Page 9 of 9
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