# Forces (Pressure, Atmospheric Pressure, Inertia, Newton's Laws, Momentum)

- Created by: Jasmine Tw
- Created on: 25-04-22 20:03

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- FORCES
- Momentum
- vector
- Conservation of momentum
- Total momentum before and after any event must be equal
- Momentum is always conserved in a collision / explosion

- Total momentum before and after any event must be equal
- P = mv
- P = momentum (kg m/s)

- Force = change in momentum / time
- F = (mv-mu) / t
- Newton's 2nd law

- F = (mv-mu) / t

- Pressure
- Upthrust
- submerged object experience an upward pressure below it
- greater pressure on the bottom surface than the top surface

- Floats
- its weight is less than the weight that water displaces
- E.g. 100 kg object has to displace 100 kg water to float
- object doesn't completely submerge before displacement finish

- its weight is less than the weight that water displaces

- submerged object experience an upward pressure below it
- force exerted by liquid
- measured in pascals (Pa)
- p = F/A
- force per unit area

- column of liquid
- p = h rol g
- h = height (m)
- rol = density

- p = h rol g
- Atmospheric Pressure
- Thin layer pf air around Earth
- Pressure decreases with altitude
- fewer air molecules above the unit area than the same area at lower heights
- Smaller weight, means less presure

- fewer air molecules above the unit area than the same area at lower heights

- Pressure decreases with altitude
- Model
- Isothermal: all at same temperature
- Opague to terrestrial radiation

- Thin layer pf air around Earth

- Upthrust
- Newton's Laws
- 1st: An object is at rest/constant velocity unless it's acted on by a resultant force
- Inertia
- tendency for objects to continue in uniform velocity / remain stationary
- how difficult it's for the velocity of an object to change
- inertial mass = f/a

- Inertia
- 2nd: F=ma
- acceleration is proportional to force and reversely proportional to mass

- 3rd: Every action has an equal and opposite reaction

- 1st: An object is at rest/constant velocity unless it's acted on by a resultant force
- Inertia
- tendency for objects to continue in uniform velocity / remain stationary
- how difficult it's for the velocity of an object to change
- inertial mass = f/a

- Momentum

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