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2.1: MOTION AND FORCES - Coggle Diagram
2.1: MOTION AND FORCES
Graphs
Distance-Time Graphs
Gradient = Speed
Velocity-Time Graphs
Area = Distance
Gradient = Acceleration
Vehicles
Stopping distance
= Thinking Distance + Braking Distance
Breaking Distance
Road, weather and vehicle conditions
Thinking Distance
Fatigue, drugs and alcohol
Scalar and Vector Quantities
Scalar: Magnitude only
Speed
Distance
Energy
Distance Travelled = Average Speed × Time
Average Speed = Distance / Time
Typical speeds
Cycling ~ 6 m/s
Running ~ 5 m/s
Sound ~ 330 m/s
Walking ~ 1.5 m/s
Vector: Magnitude and direction
Velocity
Displacement
Momentum
Force
Acceleration
Velocity = Displacement / Time
Acceleration = Change in Velocity / Time
Experimental Methods
Light gates
Removes uncertainty when measuring time
No human reaction time
Ruler drop
Experiment to measure human reaction time
~ 0.2–0.9 seconds
Weight
Weight = Mass × Gravitational Field Strength
Measured in N/kg
Depends on planet
Weight also changes with planet