Post on 27-Jun-2015
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Distance and Displacement
Distance is a scalar quaintly – it has a size but not direction.Displacement is a vector quantity – it has both size and direction.
Travelling from point A to point B and returning to point A - your displacement upon
returning is zero.
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Speed is a measure of how fast something moves.
Calculating Distancedistance = average speed x time d = v x t
Instantaneous Speed• Your speed at a particular instant.
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Velocity• The rate at which displacement changes. • You can drive a car at a constant speed of 60
km/h, however, every time you change direction, your velocity changes too.
Distance-Time Graphs
Pearson Science 10
Displacement-Time Graphs
Pearson Science 10
Speed-Time Graphs
Pearson Science 10
Pearson Science 10
AccelerationThe rate of change in velocity.
The formula can be rearranged to calculate the final speed:
final speed = initial speed + (ave. accel. x time taken)
v = u + at
Terminal Velocity
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Graphing Acceleration
Pearson Science 10
Newton’s First LawThe Law of Inertia - An object at rest will remain at rest unless acted on by an unbalanced force. An object in motion continues in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
InertiaThe truck has brakes, the massive rock you are transporting does not.
Newton’s Second LawAcceleration is produced when a force acts on a mass. The greater the mass (of the object being accelerated) the greater the amount of force needed (to accelerate the object).
Force = mass x acceleration F = ma
Newton’s Third LawFor every action there is an equal and opposite re-action.