AP Physics 1: MIDTERM REVIEW OVER UNITS 2-4: KINEMATICS, DYNAMICS, FORCE & MOTION, WORK & POWER

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1 MIDTERM REVIEW AP Physics 1 McNutt Name: Date: Period: AP Physics 1: MIDTERM REVIEW OVER UNITS 2-4: KINEMATICS, DYNAMICS, FORCE & MOTION, WORK & POWER 1.) A car starts from rest and uniformly accelerates to a final speed of 60.0 m/s in a time of 45.0 s. How far does the car travel during this time? 2.) A rocket near the surface of the earth is accelerating vertically upward at 20 m/s 2. The rocket releases an instrument package. Immediately after release the acceleration of the instrument package is approximately: 20 m/s2 Downwards 3.) Three stones of different mass (1 m, 2m & 3m) are thrown vertically upward with different velocities (l v, 2v & 3v respectively). The diagram indicates the mass and velocity of each stone. Rank from high to low the maximum height of each stone. Assume air resistance is negligible. III, II, I

2 4.) If a ball is thrown directly upwards with twice the initial speed of another, how much higher will it be at its maximum height? 5.) A plane 5 meters in length is inclined at an angle of 35, as shown above. A block of weight 15 N is placed at the top of the plane and allowed to slide down. The magnitude of the normal force exerted on the block by the plane is 6.) Two people are pulling on the ends of a rope. Each person pulls with a force of 150 N. The tension in the rope is:

3 7.) A block of mass 3 kg, initially at rest, is pulled along a frictionless, horizontal surface with a force shown as a function of time t by the graph below. The acceleration of the block at t = 4 s is: 8.) The 10.0 kg box shown in the figure to the below is sliding to the right along the floor. A horizontal force of 10.0 N is being applied to the right. The coefficient of kinetic friction between the box and the floor is The box is moving with:

4 9.) A 40-kg student stands on a scale in an elevator. At the instant the elevator has a downward acceleration of 1.0 m/s 2 and an upward velocity of 5.0 m/s, the scale reads approximately 10.) An automobile engine delivers watts of power to a car s driving wheels. If the car maintains a constant speed of 50 m/s, what is the magnitude of the force acting on the car? 580 N 11.) A force F directed at an angle θ above the horizontal is used to pull a crate a distance D across a level floor. The work done by the force F is

5 12.) A compressed spring has 12 J of potential energy. What is the maximum speed it can impart to a 3 kg object? 13.) The figure at right shows a rough semicircular track whose ends are at a vertical height h. A block placed at point P at one end of the track is released from rest and slides past the bottom of the track. Which of the following is true of the height to which the block rises on the other side of the track? 14.) From the top of a high cliff, a ball is thrown horizontally with initial speed v o. Create a graph that best represents the ball's kinetic energy KE as a function of time t?

6 15.) A simple Atwood's machine is shown in the diagram below. It is composed of a frictionless lightweight pulley with two cubes connected by a light string. If cube A has a mass of 4.0 kg and cube B has a mass of 6.0 kg, the system will move such that cube B accelerates downwards. What would be the tension in the two parts of the string between the pulley and the cubes? 16.) The graph represents the relationship between distance and time for an object that is moving along a straight line. What is the instantaneous speed of the object at t = 5.0 seconds? 17.) Between what times did the object have a non-zero acceleration?

7 18.) A ball of mass m is suspended from two strings of unequal length as shown above. The magnitudes of the tensions T1 and T2 in the strings must satisfy which of the following relations? 19.) A block of weight W is pulled along a horizontal surface at constant speed v by a force F, which acts at an angle of θ with the horizontal, as shown above. The normal force exerted on the block by the surface has magnitude: 20.) There are two correct answers to this question. You must select both for credit: The cart of mass 10 kg shown above moves without frictional loss on a level table. A 10 N force pulls on the cart horizontally to the right. At the same time, a 30 N force at an angle of 60 above the horizontal pulls on the cart to the left. Which of the following describes a manner in which this cart could be moving? Select two answers.