A-1 Definitions

Question 1

Mass

Answer 1

Is the quantity of matter a body contains. The unit of mass in the SI system is kilogram (kg).

Question 2

Force

Answer 2

Force may be defined as any action on a body that tends to change its size, shape, or its state of rest or motion. In the SI system, the unit of force is newton (N).

Question 3

Velocity

Answer 3

Velocity is the rate of change in position (displacement) that occurs during a given time. The unit of velocity in the SI system is the metre per second (m/s).

Question 4

Acceleration

Answer 4

Acceleration is the rate of change that occurs during a given time. The unit of acceleration in the SI system is the metre per second squared (m/s2).

Question 5

Force

Answer 5

Force has previously been defined as the action on a body that tends to change its size, shape, state of rest, or state of motion. In the SI system, the unit of force is called the newton (N).

Question 6

Pressure

Answer 6

Pressure is defined as force per unit area, and acts in a direction normal to (or at a right angle to) a surface.

Question 7

Work

Answer 7

If a force is applied to a body and causes it to move through a distance, then work is done. Work is the product of the force applied (newtons) and the distance moved (metres).

Question 8

1 Joule =

Answer 8

1 newton metre (NM)

Question 9

Power

Answer 9

Power is the rate of doing work I.e, it is the quantity of work done in a given time.

Question 10

Energy

Answer 10

Energy is defined as the capacity of a body or substance to perform work.

Question 11

Potential energy

Answer 11

Potential energy is the ability of a body to do work by virtue of its position.

Question 12

Kinetic energy

Answer 12

Kinetic energy is the ability of a body to do work due to its motion.