# FORCES AND MOTION

- Created by: Triplesciencehistoryfoodtechgerman
- Created on: 20-07-21 14:42

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- Physics: Motion and Forces
- Scalars and Vectors
- Scalar
- Magnitude (size)
- NO Direction
- Scalars have...
- NO Direction
- Magnitude (size)

- Time
- Speed
- Distance
- Mass
- Energy
- Temperature

- Vector
- magnitude (size)
- Vectors have...

- Direction
- Vectors have...

- most physical quantities are Vector quantities
- Force
- Weight
- Acceleration
- Momentum
- Velocity
- Displacement

- magnitude (size)

- Scalar
- Speed
- Speed tells you the distance an object travels at any given time
- measure in m/s
- Speed= Distance/ Time
- Typical everyday speeds
- Wind speed- 5-20m/s around 10m/s
- Walking- 1.4m/s
- Ferries-15m/s
- Cycling-5.5m/s
- sound in air-340m/s
- Trains- up to 55m/s
- Running-3m/s
- Cars in a built up area-13m/s
- Aeroplanes-250m/s
- Cars on a motorway-31m/s

- Acceleration
- Acceleration is how quickly you're speeding up
- Acceleration is not the same as speed or velocity
- Acceleration=(Final velocity-Initial velocity)/ Time
- Final velocity= Initial velocity +(Acceleration X Time)
- Time=(Final velocity-Initial velocity)/ Acceleration
- Initial Velocity= Final velocity- (Acceleration X Time)
- Uniform Acceleration is equal to Constant Acceleration
- Acceleration due to Gravity is uniform for objects in free fall.
- It is roughly equal to 10m/s

- Graphs
- Velocity/ time Graphs
- Velocity/ time graphs can have a Positive or Negative Gradient
- Gradient= Acceleration
- A Flat section means a steady speed
- Diagonal line Uphill means constant Acceleration
- Curve up means increasing Acceleration
- Diagonal line Downhill means constant deceleration
- A curve down means increasing deceleration
- The area underneath is the area travelled
- Calculate the acceleration or gradient with the normal calculation for Acceleration
- a=(v-u)/t
- Acceleration=(Final velocity-Initial velocity)/ Time
- a=(20-0)/10= 2m/s

- Acceleration=(Final velocity-Initial velocity)/ Time

- a=(v-u)/t

- Distance/ time Graphs
- Distance/ time graphs tell you how far something has travelled
- A Flat section means Stationary
- Diagonal means steady speed
- A curve up means Accelerating
- A curve down means Decelerating
- To find speed do the calculation ...
- Speed= Gradient= change in the vertical/ change in the horizontal
- On a curve
- Draw a Tangent and work out the speed with this calculation
- Speed= Gradient= change in the vertical/ change in the horizontal

- Draw a Tangent and work out the speed with this calculation

- Velocity/ time Graphs

- Scalars and Vectors
- headings
- Sub-headings

- information
- links
- Calculations

- links
- Examples
- topic
- two bikes are travelling in opposite directions they have the same speed but have different velocities because they are going in different directions
- Other
- A space shuttle lands and slows down from 70m/s to 20m/s calculate the acceleration in 20 seconds. Acceleration= (20-70)/20= -50/20= -2.5m/s^2

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