A force of 50 N is applied to push a box horizontally for 4 m. If the force makes an angle of 60° with the horizontal, how much work is done?, 100 J , 200 J, 400 J, 100 J × √3, Which of the following situations does NOT involve work being done?, Carrying a bag horizontally at constant speed, Lifting a bag vertically upward, Pushing a cart along a slope, Pulling a chair across the floor, A ball of mass 2 kg is moving at 3 m/s. What is its kinetic energy, 3 J , 9 J, 18 J, 36 J, A cyclist goes downhill without pedaling. Which statement best explains the increase in speed?, Work is done by the cyclist , Friction increases the speed, Potential energy is converted into kinetic energy, The mass of the bicycle decreases, If the net work done on an object is zero, what happens to its kinetic energy?, It increases , It decrease, It remains constant , It becomes zero.
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