Science True-False

. In a ‘free fall’ motion acceleration of the body is equal to the acceleration due to gravity.

 The value of acceleration due to gravity decreases as the altitude of the body increases.

 Propulsion of rockets is based Newton’s third law of motion and conservation of linear momentum.

. Impulse = Force

Principle of moments states that moment in clockwise direction = Moment in anti clockwise direction.

Moment of couple = Force × ⊥r distance between line of action of forces

Torque is a scalar quantity.

If the resultant force of three force acting on body is zero then the forces are called balanced forces.

Two equal force acting in opposite directions are called unlike parallel forces.

Linear momentum = mass × acceleration.

The resistance of a body to change its state of motion is known as inertia of motion.

If a motion depends on force then it is called as natural motion.

Newton’s first law explains inertia: