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Tag: force and law of motion

A stone of 1 kg is thrown with a velocity of 20 m s–1 across the frozen surface of a lake and comes to rest after traveling a distance of 50 m. What is the force of friction between the stone and the ice?

Class 9 Physics
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A truck starts from rest and rolls down a hill with a constant acceleration. It travels a distance of 400 m in 20 s. Find its acceleration. Find the force acting on it if its mass is 7 tonnes (Hint: 1 tonne = 1000 kg.)

Class 9 Physics
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Why is it advised to tie any luggage kept on the roof of a bus with a rope?

Others Class 9 Physics
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When a carpet is beaten with a stick, dust comes out of it. Explain.

Class 9 Physics
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An object experiences a net zero external unbalanced force. Is it possible for the object to be traveling with a non-zero velocity? If yes, state the conditions that must be placed on the magnitude and direction of the velocity. If no, provide a reason.

Class 9 Physics
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Two objects of masses 100 g and 200 g are moving along the same line and direction with velocities of 2 m s–1 and 1 m s–1, respectively. They collide and after the collision, the first object moves at a velocity of 1.67 ms–1. Determine the velocity of the second object.

Class 9 Physics
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From a rifle of mass 4 kg, a bullet of mass 50 g is fired with an initial velocity of 35 m s–1 . Calculate the initial recoil velocity of the rifle.

Class 9 Physics
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Explain, why is it difficult for a fireman to hold a hose, which ejects large amounts of water at a high velocity?

Class 9 Physics
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If action is always equal to the reaction, explain how a horse can pull a cart?

Class 9 Physics
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Why do you fall in the forward direction when a moving bus breaks to a stop and fall backwards when it accelerates from rest?

Class 9 Physics
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Explain why some of the leaves may get detached from a tree if we vigorously shake its branch.

Class 9 Physics
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Which of the following has more inertia: (a) a rubber ball and a stone of the same size? (b) a bicycle and a train? (c) a five rupees coin and a one-rupee coin?

Class 9 Physics
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