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Can there be displacement of an object in the absence of any force acting on it? Think. Discuss this question with your friends and teacher.
Fill in the blank with suitable word :
1 joule is the work done when a force of 1 __________ moves an object through a distance of one __________ in the direction of __________.
A force of 50 N acts on a body and moves it a distance of 4 m on horizontal surface. Calculate the work done if the direction of force is at an angle of 60° to the horizontal surface.
Determine the amount of work done when an object is displaced at an angle of 30° with respect to the direction of the applied force.
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Is power a scalar quantity?
How much energy is gained by a box of mass 20 kg when a man, runs carrying the box with a speed of 3 m/s-1 to catch the bus?
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A block of mass 30 kg is pulled up a slope, as shown in diagram with a constant speed, by applying a force of 200 N parallel to slope.
A and B are initial and final positions of block.
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(ii) Calculate P.E. gained by block. [g=10ms-2]
