# physics

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• Physics
• Forces
• Resulatant forces: a single force on an object that has the same effect as individual forces acting together
• Zero resultant force; a stationary object remains stationary, a moving object continues at a constant speed
• Non stationary force; if stationary, begins to move in the direction of a resultant force, a moving object speeds up, slows down or changes direction depending on the direction of the resultant forces
• Calculating acceleration; f =ma
• f= force N , m= mass Kg, a= acceleration m/s2
• The gradient of a distance time graph represents the speed of an object
• When an object is stationary, the line on the graph is horizontal. When an object is moving at a steady speed in a straight line, the line on the graph is straight but sloped.
• speed = distance travelled ÷ time takenSpeed is measured in metres per second, m/sDistance is measured in metres, mTime taken is measured in seconds, s
• The velocity of an object is its speed in a given direction
• When an object is moving with a constant velocity, the line on the graph is horizontal. When an object is moving with a constant acceleration, the line on the graph is straight but sloped.
• Work done is when a force moves something
• w=fd; w is work done J, f is force in N, d is the distance in m
• Power is a measure of how quickly work is being done and so how quickly energy is being transferred.

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