Physics Multiple Choice Questions 2024/2025, Exams of Physics

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1. A man pushes on a refrigerator with (F) force, but the refrigerator does not move. Does this Force F do work?: no 2. Acar is being lifted by acrane so that it moves upwards at a constant speed. Which force is doing negative work on the car as it is being lifted? A) (F) of the car acting on the rope B) (F) of the rope acting on the car C) There is no work being done because the KE of the car is Constant D) (F) of gravity on the car due to the Earth: D 3. A car is being lifted by a crane so that it moves upwards at a constant speed. Which force is doing the positive work on the car as it is being lifted? A) (F) of the carting on the rope B) (F) of the Earth acting on the car C) There is no work being done because the KE of the car is constant D) (F) of the rope acting on the car: D 4.A ball of mass m is thrown straight upward, reaching a maximum height h above its launch position.If it is caught at the same height at which it was thrown, then what is the total work done by gravity on the ball? (Here g = 9.80 m/s2.) A)0 B) mgh C) -mgh D) 2mgh E) -2mgh: A 5. A box with a mass m = 65 kilograms is being pulled by a constant force F = 140newtons at an angle , = 29degrees. The initial speed of the box is zero m/s. Write an expression for the work done by force (F) as the block moves a horizontal distance d. Write function for the problem.: W= Fdcos(theta) 6. An objects speed is increased by a factor of three. What does this do to its KE?: the KE increases by more than factor of 3 7. The person in the diagram pushes a lawn mower a distance d, applying a constant force of magnitude F that makes an angle ,with the displacement, which is horizontal. A constant frictional force of magnitude f acts opposite in direction to the displacement. The only other forces on the lawn mower are gravity and the normal force. Which of the forces do zero work on the lawn mower?: Gravity and Normal Forces