Statics

Question 1

Define force

Answer 1

Force is that which changes a body’s state of rest or of uniform motion in a straight line.

Question 2

What is the SI unit of force?

Answer 2

Newton’s

Question 3

What is the imperial unit of force

Answer 3

Pounds (lb)

Question 4

What is a moment?

Answer 4

The turning effect of a force.

Question 5

Formula for a moment

Answer 5

Moment = Force (N) x Perpendicular Distance (M)

Question 6

Calculate force 2 if
Force 1 = 80N
The distance from F1 is 3m and the distance from f2 is 0.2m

Answer 6

1200

Question 7

Formula for force

Answer 7

Mass x gravity (10)

Question 8

Force of gravity?

Answer 8

10

Question 9

Equation for solving moments

Answer 9

F1 x a = F2 x b

Question 10

Define torque

Answer 10

The force applied to a body that is provided at a point

Question 11

What is a couple?

Answer 11

A pair of forces that are equal and opposite but applied at points separated by distance perpendicular to the forces.

• parallel
• equal magnitude
• opposite direction

Question 12

What is a vector and give an example

Answer 12

They have a direction and a magnitude.

Eg - Force, velocity, acceleration, displacement, weight

Question 13

What is a scalar quantity?

Give an example

Answer 13

Have a magnitude but no direction.

E.G, speed, mass, distance, volume

Question 14

What is the centre of gravity?

Answer 14

The point about which the body is perfectly balanced. (Geometric centre)

Question 15

What is stress?

Answer 15

Pressure over an area. It produces deflection or deformation in the material.

Question 16

What are the 5 different types of stress

Answer 16

Tensile
Compressive
Torsion
Shear
Bending

Question 17

What is tensile stress?

Answer 17

Axial or normal stress.

Question 18

What is Hooks Law?

Answer 18

Stress is directly proportional to strain.

Question 19

The formula for hooks law?

Answer 19

F (fish thing) K

Question 20

What is linear region?

Answer 20

When it can go back to its original state.

Question 21

What is the plastic region

Answer 21

Where it cannot go back to its original state

Question 22

What is Young’s modulus and units

Answer 22

Stress / strain = strength

Same unit as stress

Question 23

The formula for stress

Answer 23

Force/area

Question 24

How to calculate bulk modulus

Answer 24

Pressure/volumetric strain

Question 25

Formula for bulk modulus

Answer 25

Force/area x original volume/ Change in volulme

Nm2

Question 26

How to work out volumetric strain

Answer 26

Change in volume/ original volume

Question 27

3 types of strain

Answer 27

Axial
Volumetric
Transverse

Question 28

What is transverse strain

Answer 28

Change in diameter / original

Question 29

What is bending?

Answer 29

Combination of tension and compression

Question 30

Define hardness

Answer 30

High resistance to indentation

Question 31

Define toughness

Answer 31

Ability for a substance to resist breakage when deforming or impact forces are applied

Question 32

Define malleability

Answer 32

Can be beaten rolled or pressed into shape

Question 33

Define brittleness

Answer 33

Break with little or no change or shape

Question 34

Define ductility

Answer 34

Stretched into new shapes without pulling apart and will keep their new shape

Question 35

Define vapour

Answer 35

Gas that can be liquified by an increase in pressure not temp

Question 36

Define toxicity

Answer 36

Poison

Question 37

Define inert

Answer 37

Will not chemically combine with another substance

Question 38

What is buoyancy?

Answer 38

When an object is submerged in liquid the object displaces a volume of liquid equal to its volume

Question 39

What is Archimedes principle?

Answer 39

A body will float in any liquid that has a weight density greater than the weight density of the body.

Question 40

What is the equation for buoyancy ?

Answer 40

Fb = Vs x D x G