Changing Speed

Question 1

What are the four types of motion ?
RROL

Answer 1

Rotary
Reciprocating
Oscillating
Linear

Question 2

What is rotary movement ?

Answer 2

Rotary motion moves in a complete circle Eg wheel turning

Can be measured by counting how many times a circle is fully completed over a set time RPM (unit of measurement)

Rotational speed= number of revolutions over time

Question 3

How would you calculate the rpm if a cyclical is completed 18 rotations in 15 seconds ?

Answer 3

18 over 15 =1.2 rpm

Question 4

What is linear motion ?

Answer 4

Straight line Eg train

Calculated by dividing distance over time

Linear speed= distance/ time

Question 5

What is oscillating motion ?

Answer 5

Moves backwards and forwards in a part of a circle ( it must be repetitive tho !!!)
Eg pendulum

Measured in oscillations per (unit time)

Question 6

What is reciprocating motion ?

Answer 6

Backwards and forwards/ upwards or downwards in a straight line
Eg piston or pump

Motion is also measured in oscillations per unit time