b What are (i) free fall, (ii) acceleration due to gravity (iii) escape velocity (iv) centripetal force ?
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(i) Free Fall→ When gravity is the only and only force acting on a body under a fall.
(ii) Acceleration Due to Gravity→ The acceleration produced by the Gravitational Force on a body. It is equal to 9.81 m/s².
(iii) Escape Velocity→ Velocity needed by a object to escape earth's gravitational force and going in outer space. A concept of Projectile Motion. It is equal to 11.1 km/s.
(iv) Centripetal Force→ Force needed by an object to remain in its circular path. It acts inwards towards center.
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