Making Machines

Question 1

A moment is sometimes known as a ……. Force

Answer 1

Turning

Question 2

What is the moment triangle

Answer 2

M
F D

Question 3

Calculate the moment on a nut if a spanner is 10cm long and there is a force of 5N

Answer 3

50Ncm

10 X 5

Question 4

Calculate the force on the seesaw if the seat is 3m from the pivot and the moment created is 1800Nm

Answer 4

600N

Working out

1800/3

Question 5

Calculate the distance to the pivot if there is a moment of 250Nm and a force of 25N

Answer 5

10cm

250/25

Question 6

How to find the ratio load/lift

Answer 6

Load divided by lift

Question 7

When the ratio of one variable to another is always the same we can say what?

Answer 7

We can say it is proportional to the other

Question 8

What do we call it when the clockwise moment is equal to the anti-clockwise moment

Answer 8

Equilibrium

Question 9

What can we say mathematically if the moments are equilibrium

Answer 9

Force X distance (clockwise) = force X distance (anti-clockwise)

Question 10

use paper
Calculate this equilibrium crane situation.

Counter weight = 8000N
Distance = 5m

Weight = 6000N
Distance= ?

Answer 10

Moment anti-clockwise (MA) = 8000 X 5 = 40,000Nm
Moment clockwise (MC) = 6000 X distance (D)

MA = MC
6000 D = 40,000

D = 40/6

= 6.7m

Question 11

use paper

Equilibrium question. calculate unknown quantity

Counterweight = 10,000N
Distance = 7m

Weight= ?
Distance = 25m

Answer 11

Moment anti-clockwise (MA) = 10,000 X 7 = 70,000
Moment clockwise (MC) = W X 25

MA = MC
70,000 = 25W

W= 70,000/25

=2800N

Question 12

What 2 things can a gear system change

Answer 12

Speed
Direction

Question 13

What type of gears meet at an angle

Answer 13

Beval

Question 14

What type of gear uses a screw

Answer 14

Worm

Question 15

How are gears and wheels similar

Answer 15

Circular

Question 16

How are gears and wheels different?

Answer 16

Gears have teeth

Question 17

What turns faster a larger gear or the smaller one

Answer 17

Smallerone

Question 18

How to work out the “ratio of effort to load”

Answer 18

Effort/load

Question 19

How does increasing the number of pulley ropes affect the effort force

Answer 19

Effort decrease by the pulley ropes increasing

Question 20

Is there a relationship between the number of ropes and ratio

Answer 20

Yes. Number of ropes = load/effort

Question 21

As more pulleys and rope is introduced to the system what other force starts to have a larger impact on the efficiency on the system

Answer 21

Friction

Question 22

Effort = ?

Answer 22

Load ➗ number of ropes