Mechanics

Question 1

Define mass

Answer 1

The measure of the amount of matter an object has

Question 2

Define matter

Answer 2

Anything that has mass and takes up space

Question 3

Define weight

Answer 3

The force exerted on a body by gravity
It is the amount of mass of an object, it depends on gravity

Question 4

Pythagerous theorem

Answer 4

a²+b²=c²

Question 5

Trigonometric Functions

Answer 5

Soh Cah Toa
Sin= opp/hyp
Cos= adj/hyp
Toa= opp/adj

Question 6

Define moments

Answer 6

The moment of a force is a measure of the turning effect of the forceabout a Point

Question 7

Moment depends on

Answer 7

The magnitude of the force
The length of the lever upon which the force acts

Question 8

Moment formula

Answer 8

M = F x d
Force by perpendicular distance from the pivot point

Question 9

The principle of moments

Answer 9

If an object is in equilibrium, the sum of the clockwise moments is equal to the sum of the anticlockwise moments moments about the point

Question 10

What’s that if the weight is moved from the pivot Point?

Answer 10

The beam will slant because of an upthrust to calculate the upthrust, Calculate the force.

Question 11

Direction from start point

Answer 11

A bearing
Minus the directions calculated using tan inverse method from 90

Question 12

What are newtons laws of motion?

Answer 12

A body in motion will stay in motion and body. Rest will stay in rest, unless acted upon external force.

Force equals mass by acceleration due to gravity

For every action, there is an opposing reaction

Question 13

F=

Answer 13

ma

Question 14

Work done on a body wrt force formula

Answer 14

W=Fs
s is distance

Question 15

Energy formula

Answer 15

Energy or work done or energy transferred is Pt

Question 16

Energy formula

Answer 16

Energy or work done or energy transferred is Pt

Question 17

Define power (mech)

Answer 17

The measure of the rate at which work is done or at which energy is converted from one form to another.

Question 18

1W to Joule per second

Answer 18

1 watt equals one joule per second

Question 19

Alternative power formula using velocity

Answer 19

Power is force by velocity

Question 20

km/h to m/s

Answer 20

divide by 3.6

Question 21

Define potential energy

Answer 21

The energy stored in a body due to the position of the body

Question 22

Potential energy formula

Answer 22

Pe =mgh
M is mass
G is gravitational acceleration
H is Height

Question 23

Define kinetic energy

Answer 23

The energy a body possesses due to its motion

Question 24

Kinetic energy formula

Answer 24

1/2mv²
M is mass
V is velocity

Question 25

Principle of conversion of energy into

Answer 25

Energy can't be created of destroyed

Question 26

Momentum definition

Answer 26

The product of an objects mass and velocity

Question 27

Momentum formula

Answer 27

P=mv Mass x velocity

Question 28

Force formula with respect to momentum

Answer 28

F= change in momentum over change in time

Question 29

Conservation of linear momentum

Answer 29

If the systems momentum cannot change Momentum before collision must equal momentum after collision

Question 30

What is the difference between Moments and Momentum

Answer 30

Moment has speed and or velocity while moment is a turning force

Question 31

Impulse definition and formula

Answer 31

Change in momentum I equals change in force by time

Question 32

Work formula with regards to Force

Answer 32

W=f x d

Question 33

Initial energy =

Answer 33

Initial potential energy plus initial kinetic energy

Question 34

Final energy

Answer 34

Final kinetic energy Plus final potential energy

Question 35

Define inelastic collision And give its formula

Answer 35

Collision where momentum is conserved but kinetic energy is not The stick together and move at the same velocity M1V1+M2V2= (M1+M2)V3

Question 36

Define elastic collision and give its formula

Answer 36

Collision with kinetic energy and momentum are conserved The bodies moved towards each other But they do not stick and the velocity changes M1V1+M2V2= M1V1.2+M2V2.2

Question 37

Angular momentum formula

Answer 37

mvr M is mass V is velocity R is radius

Question 38

Law of conservation of angular momentum

Answer 38

Initial momentum equals final momentum