Mechanics

Question 1

Acceleration

Answer 1

Acceleration is the rate of change of velocity per unit time

Question 2

Newton’s law 1

Answer 2

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

Question 3

Newton’s Law 2

Answer 3

When an unbalanced force acts on a body,the rate of change of
momentum is directly proportional to the force and takes place in the direction of the force

Question 4

Newton’s Law 3

Answer 4

Every action has an equal and opposite reaction,action and reaction
dont take place on the same body

Question 5

Pressure

Answer 5

Pressure is force per unit area (liquid=pgh)

Question 6

Archimede’s principle

Answer 6

states that when an object is partially or fully submerged in a liquid
the upthrust it experiences is equal in magnitude to the weight of the
liquid displaced

Question 7

Law of flotation

Answer 7

states that the weight of the floating body is equal to the weight of the
fluid displaced

Question 8

Boyle’s Law

Answer 8

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

Question 9

Newton’s Law of gravitation

Answer 9

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 10

Moment

Answer 10

Force x Perpendicular distance (fd)

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)=Fd