Dynamics

Question 1

Newton’s 1st Law of Motion

Answer 1

A body continues in its state of rest or uniform motion in a straight line, unless a resultant external force acts on it

Question 2

Newton’s 2nd Law of Motion

Answer 2

The rate of change of momentum of a body is proportional to the resultant force acting on it and occurs in the direction of the force

Question 3

Newton’s 3rd Law of Motion

Answer 3

If a body A exerts a force on body B, then body B exerts an equal and opposite force on body A

Question 4

Newton

Answer 4

One newton (N) is defined as the force which will give a 1kg mass an acceleration of 1ms-2 in the direction of the force

Question 5

Momentum

Answer 5

The momentum of a body is defined as the product of its mass and its velocity

Question 6

Impulse

Answer 6

Impulse is defined as the product of a force F acting on an object and the time for which the force acts

Question 7

Principle of Conservation of Linear Momentum

Answer 7

When bodies in a system interact, the total momentum of the system remains constant, provided no net external force acts on it