Dynamics Definitions

Question 1

Newton’s first law

Answer 1

Newton’s first law of motion states that a body will remain in its state of rest or uniform motion in a straight line unless acted upon by a resultant force.

Question 2

Newton’s Second Law of Motion

Answer 2

Newton’s second law of motion states that the rate of change of momentum of a body is directly proportional to the resultant force acting on it and the change takes place in the direction of the resultant force.

Question 3

Impulse

Answer 3

Impulse is the product of the force acting on a body and the time interval during which the force acts.

Question 4

Newton’s third law

Answer 4

Newton’s third law of motion states that if body A exerts a force on body B, then body B exerts an equal and opposite force on body A.

Question 5

Principle of conservation of momentum

Answer 5

The principle of conservation of momentum states that the momentum of a system of bodies remains constant if no net external force acts on the system.

Question 6

Elastic collision

Answer 6

Elastic collision in which both momentum and kinetic energy are conserved.

Question 7

Inelastic collsion

Answer 7

Inelastic collision in which momentum is conserved but kinetic energy is not.