# physics

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## Acceleration

acceleration tells us how quickly something is CHANGING velocity. the GREATER the acceleration the bigger the change in VELOCITY in a certain TIME. the acceleration of an object can be calculated using this formula:

ACCELERATION=CHANGE IN VELOCITY/TIME TAKEN TO CHANGE VELOCITY

acceleration is measured in m/s(squared)

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## balanced forces

a force is a PUSH or a pull. it can CHANGE the shape or speed of an object or change the direction and object is moving in.BALANCED forces cancel each other out. balanced forces are the same SIZE but can act in different DIRECTIONS. if the force on an object balanced, or if no force acts on an object, its motion will not change. it will either remain STATIONARY or continue at a steady SPEED. when an object is reasting on a surface its WEIGHT is cancelled out by the surface pushing up on the object. when an UNBALANCED or resultant force acts on an object it will change the way the object is MOVING. if the object is stationary or moving in the same DIRECTION as the force, it will make an object ACCELERATE in the direction of the force. if the onbject is moving in the opposite direction to the force it will make the object DECELERATE.

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## moving through fluids

when an object move through a liquid or a GAS, drag tries to SLOW them down. if the object is moving through air the force is also called AIR RESISTANCE. it is caused by PARTICLES hitting the front surface AREA of the object. the BIGGER the force will be. SREAMLINING can reduce drag by making it easier for the particules to FLOW over the onject. the FASTER the object is traveling, the bigger the DRAG will be.

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## force and acceleration

when an unbalanced force acts on an object it will ACCELERATE or DECELERATE. the bigger the unbalanced for the ****** the size of the acceleration. the bigger the MASS of the object the bigger the size of the FORCE needed to produce the same acceleration.

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## terminal velocity

the faster an object moves, the greater the AIR RESISTANCE. eventually the WEIGHT pulling down, or the DRIVING force pushing the object forward, will be cancelled out by the FRICTION forces trying to slow the object down. when the forces are BALANCED the object wil stop accelerating and will travel at a STEADY speed called its TERMINAL VELOCITY.

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