Write the direction of force and displacement in the following cases.
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(a)Gravitational force
While climbing up the stairs, you are moving against gravity, which act towards the centre of the Earth. But while coming down, you are moving towards gravity i.e. towards the centre of the Earth.
(b)Friction force
A mechanical brake applies a friction force to convert the kinetic energy of the vehicle into thermal energy which then dissipates into the atmosphere.
(c)Normal force
The normal force is the support force exerted upon an object that is in contact with another stable object.
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