MECHANICS

Question 1

acceleration

Answer 1

is the rate of change of velocity per unit time

Question 2

newtons first law

Answer 2

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

Question 3

newtons second law

Answer 3

When an unbalanced force acts on a body, the rate of change of the body’s momentum is directly propotional to the foce and takes place in the direction of the force. [ F ≈ (mv-mu)/t –> F = km(v-u)/t –> F = kma –> F = ma ]

Question 4

newtons third law

Answer 4

Every action has an equal and opposite reaction.

Question 5

pressure

Answer 5

is force per unit area. P = F/A -> Due to liquid: P = pgh

Question 6

Archimedes’ Principle

Answer 6

states that when an object is partially or completely immersed in a fluid it experiences an upthrust equal in magnitude to the weight of the fluid displaced

Question 7

law of flotation

Answer 7

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

Question 8

newtons law of universal gravitation

Answer 8

states that 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 9

Boyles law

Answer 9

states that at constant temperature the volume of a fixed mass of gas is inversely proportional to to its pressure

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