Physics P3.2 (Using Physics to make things work)
Mindmap on GCSE Physics Unit P3 sub-unit 2.
- Created by: Ethan
- Created on: 19-03-13 21:01
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- Physics P3 U2
- Moments
- Moment = The turning effect of a force
- Moment = Force x perpendicular distance from pivot
- Nm = N x m
- Centre of Mass
- All mass is thought to be concN at one point
- Symmetrical object: COM along axis of symmetry
- If there are more than 1, COM is where they meet
- Stability
- Objects Line of Action of weight passes through its COM straight down towards the ground
- When LOA of the weight goes outside the base of an object
- There will be a resultant moment
- Object will topple over
- There will be a resultant moment
- How to improve stability
- Make the base of object wider
- This means it has further to *** before LOA of weight is outside base
- Lower the COM
- This means it has further to *** before LOA of weight is outside base
- Lower the COM
- Make the base of object wider
- Hydraulics
- Pressure = force/area
- Pressure is given in Pa or N/m^2
- Hydraulic Pressure Systems
- Liquids are virtually incompressible
- Forces exerted at one point in the liquid will be transmitted at other points
- Pressure acts equally in all directions
- Forces exerted at one point in the liquid will be transmitted at other points
- Force Multipliers
- Liquids are virtually incompressible
- Hydraulic Pressure Systems
- Liquids are virtually incompressible
- Pressure acts equally in all directions
- Pressure acts equally in all directions
- Force Multipliers
- Liquids are virtually incompressible
- Pressure = force/area
- Circular Motion
- Centripetal Acceleration
- Object moving in a circle
- Constantly changing direction
- Constantly changing velocity
- Therefore it is continually accelerating
- Constantly changing velocity
- Constantly changing direction
- Object moving in a circle
- Centripetal Force
- Object only accelerates when a resultant force is present
- Centripetal Acceleration
- Object moving in a circle
- Constantly changing direction
- Constantly changing velocity
- Therefore it is continually accelerating
- Constantly changing velocity
- Constantly changing direction
- Object moving in a circle
- Centripetal Acceleration
- If this stops..
- Object will continue in a straight line at a tangent to the circle
- Object only accelerates when a resultant force is present
- Centripetal Acceleration
- Pendulums
- Equilibrium position is where the pendulum is not moving
- Simple Pendulum
- Mass called a blob
- Mass suspended with a thin string from a fixed point
- Occilations
- Amplitude of an occilation is: distance from equilibrium position to highest point
- Time period is time taken for one full occilation
- Full oscillation = amplitude to other side and back
- Depends ONLY upon length of pendulum
- Longer pendulum = longer time
- Frequency = no. of occilations per second
- Moments
- Moment = Force x perpendicular distance from pivot
- Nm = N x m
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