PHYSICS DEFINITION:
Acceleration: The rate of change of velocity of an object; the unit is m/s^2.
Constant Acceleration: When the change in velocity of an object is the same in the same period, sometimes called uniform acceleration.
PHYSICS KEYWORD LIST:
Uniform Acceleration: When the change in velocity of an object is the same at the same time.
Non-Uniform Acceleration: When the velocity of an object changes by different amounts in the same period.
Tangent: A straight line that touches a curve but does not cross it at a point.
Free Fall: When an object accelerates due to gravity in the absence of any other forces such as air resistance.
Component: The effect of a vector along a particular direction.
PHYSICS CHAPTER WISE SUMMARY:
Acceleration is equal to the rate of change of velocity. It is a vector, has units m/s^2 and can be found from the gradient of a velocity-time graph. The area under this graph is the change in displacement.
Acceleration, velocity, displacement and time for a uniform acceleration are related by the equations of motion, which you should know how to derive and use.
The acceleration of free fall is taken as 9.81 m/s^2 and you should know an experiment to measure this quantity.
Vector quantities can be resolved into components. Components at right angles to one another can be treated independently. For a velocity v at an angle, to the x – direction the components are:
x – direction: v cos angle
y – direction: v sin angle
In the absence of air resistance, projectiles involve a constant acceleration downwards and a constant velocity horizontally. These can be treated independently of one another.
PHYSICS IMPORTANT NOTES:
Average Acceleration: Change in velocity/ Time Taken
Acceleration = Gradient of velocity – time graph
Displacement = Area under velocity – time graph
Four equations of motion:
- v = u + at
- 2 s = (u + v) t
- s = ut + 0.5 at^2
- v^2 = u^2 + 2as
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