AP Physics 1 Midterm Exam Review (2023/ 2024 Update) Questions and Verified Answers | 100% Correct
Q: A coin rests on a turntable a distance r from the axis of rotation. The turntable rotates with a constant speed of v. What is the minimum coefficient of static friction between the turntable and the coin?
Answer:
v^2/rg
Q: An object of mass m moves at a constant speed v around a circular path of radius r. The net force applied to the object is F. What happens to the net force if speed is doubled and radius remains the same?
Answer:
It quadruples
Q: A ball of mass m attached to a light string moves at a constant speed v in a vertical circle with a radius R. Which of the following is true about the magnitude of the net force at point A (top of circle) compared to that at point B (bottom of circle?
Answer:
The net force at point A is equal to the net force at point B
Q: An object travels in a circular path of radius r at a constant speed v. What happens to the object's acceleration if the radius of the circle is doubled and the speed is doubled?
Answer:
It doubles
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Q: A pilot preforms a vertical maneuver around a circle with a radius R. When the airplane is at the lowest point of the circle pilot's apparent weight is 3mg, what is the velocity at the lowest point?
Answer:
(3rg)^1/2
Q: A man drives a car around a circular track of radius r at a constant speed v, where v is the max. speed he can maintain without slipping. If he wishes to do it a second time without slipping, which of the following are possible?
Answer:
He can cut the speed to one fourth and cut the radius to half.He can double to speed and quadruple the radius.
Q: Two cars, one on the moon and one on Earth, are traveling around identical banked curves.Which of the following statements are true?
Answer:
The max. speed they can maintain without slipping does not depend on their masses.The car on the moon will have a lower max. speed.
Q: A net force F acts on a mass m and produces an acceleration a. What acceleration result if a net force 4F acts on a mass 2m?
Answer:
2a
Q: A golf club hits a golf ball with a 700 N instantaneous force. What can be said about the instantaneous force that the ball exerts on the club?
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Answer:
The force is exactly equal to 700 N The direction of the force is from the ball to the club
Q: An object of mass m is hanging by a string from the ceiling of an elevator. The elevator is moving down at a constant speed. What is the tension in the string?
Answer:
Equal to mg
Q: An object of mass m is hanging by a string from the ceiling of an elevator. The elevator is moving downward, but slowing down in order to stop at the next floor. What is the tension in the string?
Answer:
Greater than mg
Q: What can be deduced about a packing crate that is sliding down an inclined plane at constant velocity?
Answer:
A friction foce is acting on it
Q: A block of mass m slides down a frictionless plane inclined at an able with the horizontal.
The normal force exerted by the plane on the bloc is directed:
Answer:
Perpendicular to the plane
Q: A person of weight 480 N stands on a scale in an elevator. What will the scale read when the elevator is accelerating upward at 4 m/s^2
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