Forces and Stresses

Question 1

What sort of force is tension

Answer 1

Causes an object to be stretched or pulled apart
(Tug of war)

Tensile strength

Question 2

What would happen if rope didn’t have tensile strength

Answer 2

It would snap

Question 3

What are compression forces

Answer 3

Pushing force that squeeze an object

Question 4

Give an example of compression forces

Answer 4

Table and chair legs are under compression

Question 5

What are shear forces

Answer 5

Forces that act across a material by acting next to one another but not directly opposite each other

Shearing forces cuts the object by pushing it sideways in different directions

Question 6

Give some examples of shear forces

Answer 6

Scissors and garden shears have a shearing action that cause something to e cut by making one piece slide across the other and making two pieces.

Question 7

What are bending forces

Answer 7

They act at an angle to an object and make bit bend

Question 8

When an object bends, it is under……….and…………at the same time.

Answer 8

Compression

Tension

Question 9

Give na example of a bending force

Answer 9

Placing to many books on a bookshelf, causing the shelf to bend

Question 10

What is torsion

Answer 10

Twisting forces that are applied to an object

Question 11

Give an example of torsion

Answer 11

When you twist a screw cap of the top of a bottle, we are applying torsion.

A propeller shaft on a ship connects the ships engine to the propellor.

Question 12

What are enhancing materials

Answer 12

Materials can be enhanced to resist and work with forces and stress to improve functionality

Question 13

How can you enhance a material

Answer 13

They can be reinforces (strengthened), stiffened (made more rigid), or made more flexible.

Question 14

Give an example of enhanced material

Answer 14

Ropes is made by many twines of yarns together to form a stronger material with more tensile strength.

Question 15

What is good and bad with concrete

How can you improve it

Answer 15

Concrete is very good at resisting compressive forces, but is not very good with tension

Can be reinforced with steel bars which are embedded within the connote before it sets. (composite)

This is used in the constructive industry in bridges where there are high tensile forces and compressive loads

Question 16

How can you stiffen timber

Answer 16

Laminating

Question 17

What is laminating

Answer 17

Thin layers of timber are glued together to shape and stiffing the material the manufacture of chairs and other materials.

Question 18

Where is laminated timber used

Answer 18

Construction industry- by laminating a number of small excess together into a large beam, it gives greater strength to resist the forces that drat bending, compressive and tensile loads.

Question 19

What are fibre reinforces polymers

Answer 19

Used to increase the strength or elasticity of non-reinforced polymers

Question 20

What are materials are added to polymers to improve them

Answer 20

These composite materials have a polymer matrix, usually epoxy or pollster which is reinforced with fibres such as carbon or glass fibres

Bulletproof armour

Question 21

How do you give greater strength to fabrics

Answer 21

By having them woven

Question 22

Give an example of woven fabrics

Answer 22

Webbing is a fabric that has been woven

It is used when the material is going under tension

Seatbelt, parachutes and backpack straps

Question 23

Laminated tigers are an example of………..

Answer 23

Engineered timbers

Question 24

Give 5 ways in which materials can be reinforced, stiffened or made more flexible.

Answer 24

Lamination - wood
Bending - Courragated card
Folding
Webbing
Fabric interfacing