Mechanics

Question 1

Simple Harmonic Motion

Answer 1

it’s acceleration is directly propotrional to its distance from a fixed point on its path.

its acceleration is always directed towards that path

Question 3

Angular Velocity

Answer 3

the rate of change of angle per unit time

Question 4

Archimedes Principle

Answer 4

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 flood displaced.

Question 5

Boyle’s Law

Answer 5

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

Question 5

Centripetal Acceleration

Answer 5

is acceleration a body has towards the centre of the circular path its moving on

Question 6

Couple

Answer 6

two parallel forces with the same magnitude acting in opposite directions

Question 6

Centripetal Force

Answer 6

the force acting towards the centre for a body moving in a circular path

Question 7

Density

Answer 7

Mass/volume

Question 8

Distance

Answer 8

measure of the seperation between two points

Question 8

Displacement

Answer 8

The Seperation between two point in a given direction

Question 9

energy

Answer 9

the ability to do work

Question 10

Acceleration

Answer 10

the rate of change of velocity with respect to time

Question 10

Force

Answer 10

That which changes or tends to change the velocity of an object

Question 10

Formula for Gravitational Potential energy

Answer 10

E_p=mgh

Question 11

Formula for Kinetic Energy

Answer 11

E_k= 1/2mv²

Question 12

Friction

Answer 12

a force that opposes motion between two surfaces in contact

Question 12

Hooke’s Law

Answer 12

states that the extension of an elastic body is directly proportional to the force producing the extension

Question 13

Kinetic Energy

Answer 13

The energy a body has due to its motion

Question 15

Law of Floatation

Answer 15

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

Question 16

Lever

Answer 16

Any rigidd body that is free to rotate about a fixed point calledf a fulcrum

Question 17

Moment

Answer 17

Force x perpendicular distance

Question 18

Momentum

Answer 18

the product of mass and velocity of a body

Question 19

Newton’s first law of motion

Answer 19

states that every object will remain in a state of rest or travelling with a constant velocity unless an unbalanced external force acts on it

Question 21

Newton’s third law of motion

Answer 21

Every action has an equal and opposite reaction

Question 23

Newton's Law of Universal Gravitation

Answer 23

states that the force between two bodies is directly proportional to the product of their masses and inversely proportional to the square of the distance between them

Question 24

Newtons Second Law of Motion

Answer 24

The rate of change of momentum is directly proportional to the applied force and takes place in the same direction in which the force acts

Question 25

Period of an orbit

Answer 25

the time taken for a satellite to go once around the central body

Question 25

Potential Energy

Answer 25

the stored energy a body has due to its position or state

Question 26

Power

Answer 26

the rate at which work is done or energy is converted

Question 28

Pressure

Answer 28

Force/ Area unless its a liquid it = pgh (density)(gravity)(depth)

Question 30

principle of conservation of energy

Answer 30

energy cannot be created or destroyed but can only be converted from one form to another

Question 32

Principle of conservation of momentum

Answer 32

in any close system of colliding bodies, the total momentum remains constant.

Question 33

Proof: F=MA is a special case of Newton's 2nd Law

Answer 33

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Question 34

Renewable source of Energy

Answer 34

One that will nopt be exhausted e.g wind,solar and tidal.

Question 35

Scalar

Answer 35

only has magnitude

Question 36

Speed

Answer 36

distance/time

Question 37

The Centre of Gravity

Answer 37

of an object is the point through which the weight of the object appears to act

Question 38

The efficency of a machine

Answer 38

the energy output as a percentage of energy input

Question 39

Torque (moment of a couple)

Answer 39

The magnitude of one force multiplied by the perpendicular distance between them

Question 40

Vector

Answer 40

has magnitude and direction

Question 41

Weight

Answer 41

the force with which a mass is attracted to a planet

Question 42

Work

Answer 42

is done when a force causes a body top be displaced. (W=Fd)