Dynamics

Question 1

Gravitational field strength

Answer 1

The gravitational force acting on a unit mass.

Question 2

Force

Answer 2

An influence which changes, or tries to change, the state of motion of a body, or the shape or size of a body.

Question 3

Newton’s First Law

Answer 3

An object at rest will remain at rest and an object in motion will remain in motion at constant speed in a straight line unless a resultant force acts on it.

Question 4

What is the inertia of a body

Answer 4

It is its tendency to remain in its state of rest or motion.

Question 5

Newton’s Second Law

Answer 5

The resultant force acting on an object is equal to the product of the mass and the acceleration of the object ; the direction of the force is the same as that of the object’s acceleration.

Question 6

Newton’s Third Law

Answer 6

The force which body A exerts on body B is equal in magnitude and opposite in direction to the force which body B exerts on body A.

Question 7

Gravitational field

Answer 7

A region in which a mass experiences a force due to gravitational attraction