Mechanics

Question 1

Acceleration

Answer 1

The rate of change of velocity per unit time

Question 2

Newtons 1st Law

Answer 2

A body will remain in a state of rest or traveling at a constant velocity unless an external force acts on it

Question 3

Newtons 2nd Law

Answer 3

When an unbalanced force acts on a body, the rate of change of the body’s momentum is directly proportional to the force and takes place in the direction of force (F=ma)

Question 4

Newtons 3rd Law

Answer 4

Every action has an equal and opposite reaction

Question 5

Pressure

Answer 5

Is the force per unit area

Question 6

Archimedes’ Principle

Answer 6

When an object is partially or fully immersed in a fluid it experiences an upthrust equal in magnetic to the weight of the fluid displaced

Question 7

Law of flotation

Answer 7

The weight of a floating body is equal to the weight of the fluid it displaces

Question 8

Boyle’s Law

Answer 8

At constant temperature the volume of a fixed mass of gas is inversely proportional to its pressure

Question 9

Newtons Law of Universal Gravitation

Answer 9

Any two point masses in the universe attract each other with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between them

Question 10

Moment

Answer 10

Force x Perpendicular distance

Question 11

Couple

Answer 11

Two parallel forces with the same magnitude acting in opposite directions

Question 12

Torque

Answer 12

Moment of a couple (T=Fd)