Page 28-29 Gears and motion

Question 1

Linear motion

Answer 1

Moving one way in a straight line.

Question 2

Reciprocating motion

Answer 2

Moving backwards and fowards in a straight line. E.g a piston.

Question 3

Oscillating motion

Answer 3

Moving backwards and fowards in an arc. E.g a swing.

Question 4

Rotary motion

Answer 4

Moving in a circle e.g a wheel.

Question 5

First order lever

Answer 5

Pivot between effort and the load. The closer the load to the pivot the easier it can be lifted.

Question 6

Second order lever.

Answer 6

The pivot is at one end and the effort is at the other. The load is in the middle. E.g a wheelbarrow. The closer together the pivot and load are the easier to lift it is.

Question 7

Push Pull linkages

Answer 7

Use two fixed pivots. The input and output are in the same direction. The motion of the link arm is in the opposite direction. Changing the position of these pivots will change the magnitude of an output force.

Question 8

Bell crank.

Answer 8

A bell crank changes direction of a force through 90degrees. The magnitude of the output force can be changed by moving the fixed pivot so that it is not equidistant between the two moving points.

Question 9

Gears

Answer 9

Toothed wheels that interlock eachother. Transfer motion to different parts of a machine.

Question 10

A geartrain

Answer 10

Where two or more gears are linked together in order to change the direction of motion or change the magnitude of the input force.

Question 11

Driver gear

Answer 11

Turns the driven gear and both will turn opposite directions.

Question 12

Idler

Answer 12

Does not alter the speed of the other two gears. Goes in the middle of the driver gear and driven gear so they can both rotate in the same direction.

Question 13

Gear Ratio

Answer 13

Teeth on driven gear/Teeth on driver gear

Question 14

Output speed

Answer 14

Speed of driver gear/gear ratio