mechanics

Question 1

acceleration

Answer 1

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 proportional to the force and takes place in the direction of the force

Question 4

newtons third law

Answer 4

every action has an equal and opposite reaction

Question 5

pressure

Answer 5

force per unit area P=F/A
due to liquid P=pgh

Question 6

Archimedes principle

Answer 6

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

Question 7

law of floatation

Answer 7

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

Question 8

boyles law

Answer 8

at a 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