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# Motion definitions

### AQA A level physics

TermDefinition
Efficiency The ratio of useful energy transferred by a device to the energy supplied
Centre of gravity The point through which all of a bodies weight acts
Acceleration – Equation and definition a=(v-u)/t, Change in velocity per unit time
Displacement Distance travelled in a given direction
Equilibrium State of an object at rest or in uniform motion
Conditions for equilibrium Resultant force zero & resultant torque zero.
Inertia Resistance of a body to changes in its motion
Kinetic energy Energy of a body due to its motion, 1/2 mv^2
Newton’s first law An object remains at rest of in uniform motion unless it is acted upon by a force
Newton’s second law (constant mass) Resultant force = mass x acceleration
Principle of moments Object in equilibrium: sum of clockwise moments about any point equals the sum of the anticlockwise moments
Terminal speed Max speed. The resultant force (of drag and weight) is equal to zero
Torque of a couple The total force x perpendicular distance between the line of action of the forces
Moment of a force about a point Force x perpendicular distance between the line of action of the force and the point
Work Force x distance moved in the direction of the force
Free fall The force due to gravity is the only force acting on an object
Assumptions for projectiles Air resistance is said to be negligible and the horizontal velocity is constant
Significance of a closed triangle of vectors Resultant force is zero / Forces in equilibrium
Created by: JamesMoly