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प्रश्न
Define Translational motion.
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उत्तर
When a force acts on a rigid body which is free to move, the body starts moving in a straight line in the direction of the force. This is called translational motion.
संबंधित प्रश्न
When do we say that work is done?
Draw a neat labeled diagram to show the direction of two forces acting on a body to produce rotation in it. Also mark the point about which rotation takes place.
A weight lifted a load of 200 kgf to a height of 2.5 m in 5 s. calculate: (i) the work done, and (ii) the power developed by him. Take g= 10 N kg-1.
A woman pulls a bucket of water of total mass 5 kg from a well which is 10 s. calculate the power used by her.
Give an example
Light energy changes to electrical energy.
Give an example
Electrical energy changes to heat energy.
(i) A 200g ball is thrown vertically upward with an initial velocity of 30 ms-1. Draw a velocity-time graph for the motion of ball.
(ii) How long will the ball take to reach the highest point?
(iii) What will be the kinetic energy of ball, when it returns to the starting point, neglecting the air resistance?
(iv) What will be the potential energy of ball at highest point?
A girl of mass 40 kg runs a height of 80 stairs, each 25 cm high with a load of 20 kg on her head in 25 sec. If g is 10 m/s2, find:
(i) Gravitational force acting on the girl.
(ii) Work done by her.
(iii) Useful work done by her.
(iv) Her power in watt.
