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giga = 10^9
Mega = 10^6
Kilo = 10^3
micro = 10 ^(-6)
nano = 10^(-9)
each complete to-and-fro motion is one oscillation
Speed(m/s) = Distance move(m) / Time taken(s)
Velocity is the change in distance in a specified direction per unit time
Displacement is distance in a specified direction
Velocity can also be defined as the change in distance per unit time
Acceleration is the change in velocity with time
Acceleration(m/s^2) = Change in Velocity(m/s) / Time taken(s)
a = (v-u)/t
Area under Speed-Time graph = Distance
Gradient of a point on Distance-Time graph = instantaneous speed
Area of Trapezium = (1/2)(a+b)(h)
All object falling accelerate at the same constant rate
Acceleration due to free fall / gravity not depend on the material, size or shape
Gravity = 10 m/s^2
A force is a push or pull
Force can cause a an object to accelerate or decelerate
For an object with Zero Acceleration, the different forces acting on it are balanced or add up to zero
Newton's 1st Law of Motion
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Every object will continue in its state of rest or uniform motion in a straight line unless a resultant force acts on it to change its state.
If the resultant force acting on an object is not zero,m we say the forces are unbalance
Newton's 2nd Law of Motion
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When a resultant force acts on an object of constant mass, the object will accelerate and move in the direction of the resultant force. The product of the mass and acceleration of the object is equal to the resultant force.
Resultant force (N) = (Mass)(Acceleration)
F = f1-f2
Newton's 3rd Law of Motion
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For every action, there is an equal and opposite reaction, and these forces act on mutually opposite bodies.
Pressure(N/m^2) = Force(N)/Area(m^2)
Mass is a measure of the amount of matter or substance in a body. It is a property of a body that cannot be changed by it location,shape and speed.
Weight is a force and has direction
Weight(N) = [Mass][Gravity]
Interia of an object refers to the reluctance of the object to change its state of rest or motion.
Density[kg m^(-3)] = Mass[kg]/Volume[m^3]
Moment of a force is the product of the force and the perpendicular distance from the pivot to the line of action of the force.
Moment of a Force [N m] = (Force)(Perpendicular Distance From Pivot)
When a body is in equilibrium, the sum of Clocwise Moments [CWM] about a pivot is equal to the sum of Anticlockwise Moments [ACWM] about the same pivot.
The centre of gravity of an object is defined as the point through which its whole weight appears to act for any orentation of the object
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