Forces
- Created by: Clare
- Created on: 24-10-12 18:59
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- Forces and Motion
- Velocity
- Terminal Velocity
- Mass and air resistance are balanced
- Zero resultant force
- Sky diver
- As they fall they speed up.
- More air resistance= less acceleration
- Force from drag balances due to gravity(terminal velocity)
- Parachute opens, increased air resistance
- Eventually rebalances at a much lower terminal velocity
- Parachute opens, increased air resistance
- Force from drag balances due to gravity(terminal velocity)
- More air resistance= less acceleration
- As they fall they speed up.
- Opposing forces are balanced so there is a constant velocity
- Affected by: Weight, Surface area, Amount of force
- Speed in a given direction
- m/s
- Terminal Velocity
- Resultant Force
- SUM of all forces acting on a body
- Objects going the same way
- ADD to find resultant force
- Objects pulling away from each other
- SUBTRACT
- Stationary
- Zero forces
- Constant Velocity
- Balanced forces
- Acceleration
- Unbalanced forces towards direction of motion
- Decceleration
- Unbalanced forces against direction of motion
- Mass x Acceleration
- Acceleration
- Acceleration= change in velocity / time
- Change in velocity= final- initial value
- Deceleration= negative
- Speed
- Stopping distance
- Thinking + Braking
- Thinking- reaction time
- Affected by: Drugs, Tiredness, Age, Distractions, SPEED
- Braking- distance between hitting brakes and stopping
- Affected by: Road surface, quality of brakes and tyres, SPEED
- Thinking- reaction time
- Distance taken for moving object to stop
- Thinking + Braking
- Distance/ Time graph
- Horizontal= stopped
- Straight line= constant speed
- Gradient= velocity (upness/ alongness)
- Steeper= faster
- Speed= Distance/ Time
- Stopping distance
- Momentum
- Momentum BEFORE= Momentum AFTER
- Conservation of momentum
- IF no other forces are acting
- Momentum= Mass x Velocity
- Velocity= m/s
- Mass= kg
- Momentum= kg m/s
- Add total momentum before collision
- Rearrange knowing momentum after to find missing vaue
- Momentum BEFORE= Momentum AFTER
- Moments
- Moments make things turn or rotate around a point
- Moments= Distance from pivot x Mass
- Lift more weight= more distance between pivot and force
- Have direction- clockwise or anticlockwise
- Measured in Nm (Newton Metres)
- Fixed point- pivot or fulcrum
- Mass, Weight, Gravity
- Mass: amount of matter in the object
- Different per object but doesn't change from earth to moon
- Weight: force of gravity acting
- On earth stays the SAME
- Gravity: field created by any object with mass
- 10N per kg Towards the centre of the earth
- ALL objects fall at the same speed due to gravity always acting
- On earth: objects with a larger surface area fall slower due to air resistance
- Mass= weight gravity
- Mass: amount of matter in the object
- Velocity
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