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Abdul, while driving to school, computes the average speed for his trip to be 20 km h−1. On his return trip along the same route, there is less traffic and the average speed is 30 km h−1. What is the average speed for Abdul’s trip?
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What is the kinetic energy of an object?
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Write an expression for the kinetic energy of an object.
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The kinetic energy of an object of mass m moving with a velocity of 5 m s−1 is 25 J. What will be its kinetic energy when its velocity is doubled? What will be its kinetic energy when its velocity is increased three times?
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An object of mass 40 kg is raised to a height of 5 m above the ground. What is its potential energy? If the object is allowed to fall, find its kinetic energy when it is half-way down.
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An object of mass, m is moving with a constant velocity, v. How much work should be done on the object in order to bring the object to rest?
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Calculate the work required to be done to stop a car of 1500 kg moving at a velocity of 60 km/h?
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A freely falling object eventually stops on reaching the ground. What happens to its kinetic energy?
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Certain force acting on a 20 kg mass changes its velocity from 5 m s-1 to 2 m s-1. Calculate the work done by the force.
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Which of the following conditions will give the most benefits? Why?
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Why should preventive measures and biological control methods be preferred for protecting crops?
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What factors may be responsible for losses of grains during storage?
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Explain any one method of crop production which ensures high yield.
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How do storage grain losses occur?
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Change the speed of 6 m/s into km/h.
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What name is given to the speed in a specified direction ?
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Name the physical quantity obtained by dividing ‘Distance travelled’ by ‘Time taken’ to travel that distance.
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What do the following measure in a car ?
(a) Speedometer (b) Odometer
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Name the physical quantity which gives us an idea of how slow or fast a body is moving.
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In addition to speed, what else should we know to predict the position of a moving body ?
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