# test1 - Test Problems for Ch 1 1 Suppose you have two cars...

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Test Problems for Ch 1. 1. Suppose you have two cars, and the larger one is twice as massive as the smaller one. If you and a friend push on them so that their accelerations are equal, how must the forces applied to the cars compare? A) The force on the larger car is equal to that on the smaller car B) The force on the larger car is ½ that on the smaller car. C) The force on the larger car is twice that on the smaller car. D) The force on the larger car is more than three times that on the smaller car. 2. Which of the following devices on a car can be used to cause the car to accelerate? A) The gas pedal B) The brake pedal C) The steering wheel D) All the above 3. The acceleration of an object is equal to A) the rate of change of its position B) the rate of change of its velocity C) the rate of change of its speed only D) the time an object has been in motion 4. The SI units of acceleration are A) m/s B) kgm/s 2 C) m/s 2 D) kg m 2 /s 2 5. Suppose you have a car traveling down the road at constant speed and not changing direction. It is experiencing gravity, wind resistance and frictional forces from the road. What can be said about the car’s acceleration? A) It is accelerating because there are forces acting on it. B) It accelerating because the motor is running, propelling the car forward. C) It is not accelerating because gravity holds it down. D) It is not accelerating because it has constant velocity. 6. If you are backing up but slowing down, your acceleration is directed A) backwards B) nowhere C) forwards D) to the left 7. A friend states Newton’s First Law of Motion as “An object will move in a straight line unless acted upon by a force” Please evaluate the scientific merit of his statement. 8. You walk in a given direction for 20 m during the first 5 seconds of a trip and then 15 m during the next 2 seconds. Your average speed is equal to A) 8 m/s B) 2 m/s C) 5 m/s

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D) –5 m/s 9. To cause a 25 kg object to experience an acceleration of 2 m/s 2 the net force that needs to be applied to the object is A) 10 N B) 5 N C) 50 N D) 100 N 10. A net force of 8 N is applied to a 2 kg object. The object’s acceleration is A) 4 m/s 2 B) 8 m/s 2 C) 16 m/s 2 D) 2 m/s 2 11. An object experiences a net force of 20 N and has an acceleration of 4 m/s 2 . The object’s mass must be A) 20 kg B) 5 kg C) 80 kg D) 2 kg 12. At a speed of 12 m/sec how far can you travel in one minute? A)12 m B) 72 m C) 60 m D) 720 m 13. Suppose an ice skater is moving on the surface of a frozen lake at constant velocity. What is true about the external (outside) forces acting on the skater? A) There are none.
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## This note was uploaded on 09/14/2011 for the course PHYSICS 0845 taught by Professor Ahmed during the Spring '10 term at Temple.

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test1 - Test Problems for Ch 1 1 Suppose you have two cars...

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