Moments And Pressure

Question 1

What is a moment

Answer 1

Turning effect of a force. They act about an anti/clockwise direction

Question 2

What is a pivot

Answer 2

A point where the object turns on

Question 3

Calculation for a moment

Answer 3

M= force X distance perpendicular to pivot

Question 4

What does applying more force to an object do

Answer 4

You need more distance from object

Question 5

Give an example of a lever acting as a force multiplier

Answer 5

Door handle
Light switch
Spanner
Cogs
Rotating screw

Question 6

Calculation for pressure

Answer 6

P= f / area

Question 7

What happens when you compress a gas?

Answer 7

When the space gets smaller the pressure increases

Question 8

Factors of increasing pressure

Answer 8

Temp(kinetic energy)
Smaller area- more concentrated

Question 9

What happens when the conc is low

Answer 9

A large area- particles hit and force spreads out
Fewer particles means fewer collisions

Implode if too low low

Question 10

What happens when high conc

Answer 10

A small area- particles hit makes the force more concentrated
More particles means more collisions

Explode when too high

Question 11

Explain the atmosphere

Answer 11

It’s attracted to earth by gravity
The closer to the ground,the sender the atmosphere
This is why air is thinner on top of mountains
And pressure in Ocean increases as u go deeper

Question 12

Pressure in solids attributes

Answer 12

Acts in direction of the force only (weight)
The smaller the area the higher the pressure
The larger the area the smaller the pressure

Question 13

Calculation for weight/force

Answer 13

Weight= mass (kg) X GFS (n/m)

Question 14

What can’t liquids compress

Answer 14

Because the particles are not spread out like a gas

Question 15

What are hydraulic pressure

Answer 15

A pressure caused by a liquid transferring a force.

Question 16

What happens if the area of a piston is small to then go big?

Answer 16

It will take less force to raise the large piston. This is because more pressure is exerted from the small piston.

Question 17

What is pressure in a liquid

Answer 17

Caused by the weight of the water above .
Acts in all directions
Increases with depth

Question 18

Calculation for pressure in depth

Answer 18

P= height X density X gravitational field strength
P= h(m) X p(kg/M3) X g(N/kg)

Question 19

Calculation for force

Answer 19

F= p X a

Question 20

Explain Hooke’s law

Answer 20

Extension of a spring is directly proportional to the force applied, if the limit of proportionality is not exceeded.

Question 21

define Extension, compression and bending

Answer 21

Ext. Object ends pulled apart
Comp. Ends squashed together
Ben. 1 end moved passed the other end

Question 22

Explain elastic

Answer 22

Elastic - if force applied and the object changes shape, it remains the same if following Hooke’s law