15470296
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Question 1
Question
A wooden block of mass 0.60 kg is on a rough horizontal surface. A force of 12 N is applied to the block and it accelerates at 4.0 m.s^–2.
What is the magnitude of the frictional force acting on the block?
Answer
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A 2.4 N
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B 9.6 N
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C 14 N
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D 16 N
Question 2
Question
A horizontal force of 90N is used to push a box across a horizontal floor. The frictional force on the box is 50N.
What is the gain in kinetic energy of the box when it is moved through a distance of 6.0m?
Answer
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A 240 J
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B 300 J
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C 540 J
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D 840 J
Question 3
Question
A positive charge experiences a force F when placed at point X in a uniform electric field.
The charge is then moved from point X to point Y.
Distances r and s are shown on the diagram.
What is the change in the potential energy of the charge?
Answer
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A decreases by Fs
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B increases by Fs
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C decreases by Fr
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D increases by Fr
Question 4
Question
A submarine is in equilibrium in a fully submerged position.
What causes the upthrust on the submarine?
Answer
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A The air in the submarine is less dense than sea water.
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B The sea water exerts a greater upward force on the submarine than the weight of the steel.
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C The submarine displaces its own volume of sea water.
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D There is a difference in water pressure acting on the top and bottom of the submarine.
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