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2.1 Motions and Forces - Coggle Diagram
2.1 Motions and Forces
Scalar and Vector Quantities
Vector: Magnitude and direction
Momentum
Force
Displacement
Velocity = displacement / time
Acceleration
Acceleration = change in velocity / time
Velocity
Scalar: Magnitude only
Speed
Distance
Average speed = distance / time
Typical speeds
Cycling = 6 m/s
Running = 3 m/s
Walking = 1.5 m/s
Sound = 330 m/s
Distance travelled = average speed x time
Energy
Vehicles
Stopping distance
= thinking distance + braking distance
Thinking distance
Fatigue
Drugs
Alcohol
Braking distance
Road conditions
Weather
Vehicle conditions
Weight
Measurement
Measured with Newton-meter
Measured in Newtons
Weight = mass x gravitational field strength
Gravitational field strength
Measured in N/kg
Depends on planet
Weight also changes with planet
Graphs
Velocity-Time graphs
Gradient = acceleration
Area = distance
Distance-Time graphs
Gradient = speed
Experimental Methods
Ruler drop
Experiment to measure human reaction time
= 0.2 - 0.9 seconds
Light gates
Removes uncertainty when measuring time
No human reaction time