Pressure

Question 1

What is a moment

Answer 1

The turning effect of a force is called moment

Question 2

How to calculate moment

Answer 2

Moment = force x perpendicular distance

Question 3

Torque

Answer 3

The moment of a force

Question 4

Equilibrium

Answer 4

A state of balance

• if a object is in equilibrium, the forces on it must balance as well as there turning effects
• So the sum of forces acting on one direction must be equal to the sum of the forces in the opposite direction
• principal must app,y

Question 5

How to find the center of mass

Answer 5

1. Hang up the irregularly shaped object
   2.suspend the shape from a location near an edge. Drop a plumb line and mark on the object
   3.suspend the shape from another location, not to
   close to the first. Draw a line and mark its position

The center of mass is located at the point where all three lines cross

Question 6

Limit of proportionality

Answer 6

The point at which hooke’s law, does not work

Question 7

Hooke’s law

Answer 7

A material obeys hooke’s law if, beneath its elastic limit, the extension is proportional to the load

Question 8

Spring constant

Answer 8

Load = spring constant (0.1 N/mm) x extension 
F.       = k * X

Question 9

Pressure

Answer 9

Pressure = force * Area

Pressure is measured in pascals

Question 10

Properties that apply to a stationary liquid in an open container

Answer 10

1. Pressure acts in all directions
   Liquid pushes every surface it touches
2. Pressure increases with depth
   The deeper in the liquid , the higher the pressure
3. Pressure depends on the density of the liquid
   Denser the liquid the higher the pressure
4. Pressure doesn’t depend on the shape of the container
   Pressure at any particular depth is the same

Question 11

Pressure in liquids

Answer 11

=pgh

Density x10N/kg x depth

Question 12

Force multiplier

Answer 12

Multiplies the input force by 10 and gives the output

Question 13

The relationship between pressure and volume

Answer 13

The relationship between the pressure and volume is a inverse proportion

1. if the volume halves, the pressure doubles
2. Pressure x volume always has the same value

Question 14

Boyle’s law

Answer 14

For a fixed mass of gas at constant temperature, the pressure is inversely proportional to volume

Question 15

Boyle’s law equation

Answer 15

P1 x V1 =P2 x V2

Question 16

Air properties

Answer 16

• it’s pressure acts in all directions
• its pressure becomes less as u rise up through it
• can be compressed