definitions wa2 2025

Question 1

define moment of a force

Answer 1

the moment of a force about a point or pivot is the product of the force and the perpendicular distance from the line of action of the force to the point/pivot

Question 2

define principle of moments

Answer 2

when a body is in equilibrium, the sum of the clockwise moments about the balance point or pivot is equal to the sum of anticlockwise moments about the same point

Question 3

define pressure

Answer 3

pressure is the force acting normally or perpendicularly per unit area

Question 4

define mass

Answer 4

mass of a body is the measure of the amount of matter in it

Question 5

define inertia

Answer 5

inertia of a body is a measure of the reluctance for an object to change either its state of rest or if it is in motion, change its direction of motion due to its mass

Question 6

define weight

Answer 6

weight is the gravitational force acting on an object that has mass

Question 7

define gravitational field

Answer 7

A gravitational field is a region in which a mass experiences a force due to gravitational attraction

Question 8

define gravitational field strength

Answer 8

gravitational field strength at a point is defined as gravitational force per unit mass placed at a point

Question 9

define density

Answer 9

density is a substances mass per unit volume

Question 10

What is Newton’s first law of motion?

Answer 10

when there is no net force acting on a body, the body will continue with whatever motion it has

Question 11

What is Newton’s second law of motion?

Answer 11

Force = mass x acceleration

Question 12

What is Newton’s third law of motion?

Answer 12

For every action there is always an equal and opposite reaction