Mechanics (General)

Question 1

Newton’s First law

Answer 1

An object at rest remains at rest unless acted on by an external force

Question 2

Newton’s second law

Answer 2

If an unbalanced force acts on a free object it will be accelerated in the direction of the force with an acceleration which is proportional to the size of the force

Question 3

Newton’s third law

Answer 3

Every action has an equal and opposite reaction
“Whenever one object exerts a force on a second object the second object exerts an equal and opposite force on the first”

Question 4

Centre mass

Answer 4

The point at which the mass of an object is evenly distributed

Question 5

Inertia

Answer 5

The resistance an object has to a change in its motion. There are two factors involved in inertia - speed and mass

Question 6

F=Ma

Answer 6

F=Force
M= Mass
A= Acceleration

or
F=Mg
G being gravity (9.8ms-1 on Earth)

Question 7

Force and Acceleration

Answer 7

The acceleration is proportional to the force
a = F
or
A = f

Question 8

Mass, force and acceleration

Answer 8

If the mass is constant and force is doubled the acceleration will be double
The greater the mass the smaller the acceleration for the same force
If the force is constant doubling the mass will halved the acceleration. If the force is constant halving the mass will double the acceleration

Question 9

Acceleration and mass

Answer 9

Acceleration is inversely proportional to the mass a = 1/m

Question 10

Equilibrium

Answer 10

When all the forces and turning forces acting on an object are balanced equilibrium occurs. This means that the object will either remain stationary or continue to move in a straight line at a constant speed