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Form 3 Physics: Work, Energy, Power and Machines Questions and Answers

Lessons (9)

1. The figure below shows a worker ready to lift a load in a wheelbarrow a). Indicate and label on the diagram three forces acting on the wheelbarrow when the person is just about to lift the handlebars. b).Suppose the handle bars of the wheelbarrow in a) were extended, which force(s) would change and how?
1m 29s
2. Sketch a labeled diagram to show how an arrangement of a single pulley may be used to provide a Mechanical advantage of 2.
0m 31s
3. Name a device that converts light energy to electrical energy directly.
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4. State the reason why the amplitude of a simple pendulum decreases with time.
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5. A Body of mass M is allowed to slide down an inclined plane. State two factors that affect its final velocity at the bottom of the incline.
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6. The figure below shows a body of weight 50N placed on a surface which is inclined at an angle of #30^0# to the horizontal. The body experiences a maximum frictional force of 29N with the surface. Determine the force required to move the body, up the inclined with constant velocity.
1m 53s
7. The figure below is a graph which shows how the vertical height through which a machine raises a mass of 20kg varies with time. Determine the power output of the machine after 40 seconds.
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8. A body a mass 60kg is pulled at uniform velocity up smooth inclined surface as shown in the figure below. If the distance moves along the incline is 4.0m, determine work done by the force p.
2m 30s
9. A certain machine uses an effort of 400N to raise a load of 600N. If the efficiency of the machine is 75%, determine its velocity ratio.
2m 10s