OCR GCSE Design and Technology technical understanding overview quiz quiz

Tension

Compression

Shear

Bending

A triangle is rigid and cannot change shape without changing a side length, while a rectangle can rack

A triangle can change its shape very easily under a heavy load, which lets it absorb all the force safely

Triangles always use far less material than any other shape used in a frame structure

Triangles are always lighter than any other shape and so reduce the weight of the frame

Rotary motion

Reciprocating

Oscillating motion

Linear motion

The pivot

The effort

The load

Nothing

1:3

20:60

1:1

3:1

The output turns slower with more torque

The output turns faster with less torque

The output stops

There is no change in speed or torque

Speeds up the rotation of the input shaft considerably

Converts rotary motion into reciprocating or oscillating motion

Simply reverses the direction of the input rotation and nothing else at all

Stores up energy and then releases it back later on

It produces the effect, such as light or sound

It decides what the system should do

It senses a condition, such as light or heat

It stores the program

An LED that lights up as output

A light-dependent resistor sensor

A buzzer that sounds as output

A transistor or microcontroller

One chip can replace many components and be reprogrammed to change functions

It can never be changed in any way at all once the circuit has been built

It needs no power supply of any kind to run, unlike all the fixed components

It completely removes the need for any input or output devices in the circuit

It only ever creates brand new jobs and never removes any of the existing ones at all over time

It reduces routine jobs but creates skilled roles to program and maintain the machines

It only ever destroys jobs and never creates any new kinds of work for people

It has no real effect of any kind on the jobs available to the workforce

High-volume mass production

Making thousands of identical parts cheaply per unit

Prototyping and low-volume or complex parts

Producing fabric for clothing