Dynamics

Question 1

Definition of gravitational field strength

Answer 1

Gravitational force per unit mass

Question 2

Newton’s first law

Answer 2

An object at rest remains at rest and an object in motion remains in motion with constant velocity, unless the object experiences a net external force

Question 3

Newton’s second law

Answer 3

F = ma

Question 4

Newton’s third law

Answer 4

If 2 objects interact, the magnitude of the force exerted on object 1 by object 2 is equal to the magnitude of the force exerted on object 2 by object 1, and these 2 forces are opposite in direction

Question 5

What affects inertia?

Answer 5

Mass

Question 6

What does it mean when an object is in equilibrium?

Answer 6

Resultant force = 0

Question 7

Conditions of an action-reaction pair

Answer 7

Equal magnitude, opposite direction, acting on 2 different bodies

Question 8

Principle of moments

Answer 8

For an object in equilibrium, the sum of clockwise moments about any point is equal to the sum of anticlockwise moments about the same point

Question 9

Formula for moment about pivot

Answer 9

Moment = Force * Perpendicular distance of line of action of force from pivot