Mechanics

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35 Terms

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SUVAT

Equations of motion that can be used when an object is moving at uniform acceleration

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Distance

Scalar quantity that describes the amount of ground the object has covered

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Displacement

Vector quantity that describes the overall distance travelled from the starting position

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Speed

Scalar quantity that describes the distance travelled per unit time

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Velocity

Vector quantity that describes the rate of change of displacement

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Acceleration

Vector quantity that describes the rate of change of velocity

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Uniform acceleration

Where the acceleration of an object is constant

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Area under acceleration-time graph

Velocity

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Gradient of velocity-time graph

Acceleration

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Area of velocity-time graph

Displacement

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Gradient of displacement-time graph

Velocity

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Instantaneous velocity

The velocity of an object at a specific point in time

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Resolving vectors

Splitting a vector into its vertical and horizontal components

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Adding vectors using trig

Used when two vectors are perpendicular to each other. Use Pythagoras’ theorem to find the magnitude and trigonometry to find the direction

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Adding vectors using a scale drawing

Used when vectors are at angles other than 90°. Use a ruler and protractor to find the magnitude and direction, making sure to note the scale used

<p>Used when vectors are at angles other than 90<span>°. Use a ruler and protractor to find the magnitude and direction, making sure to note the scale used</span></p>
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Projectile motion

Vertical and horizontal components of a projectile’s motion are independent. Use SUVAT in two dimensions, ignoring air resistance so acceleration is constant

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Free-body diagrams

A diagram which shows all the forces that act on an object

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Newton’s first law

An object will remain at rest or travelling at a constant velocity, until it experiences a resultant force

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Newton’s second law

The acceleration of an object is proportional to the resultant force experienced: F=ma

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Newton’s third law

For each force experienced by an object, the object exerts an equal and opposite force

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Terminal velocity

Frictional forces acting on an object are equal to the driving forces, so there’s no resultant force and no acceleration

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Gravitational field strength

The force per unit mass exerted by a gravitational field on an object: g=F/m

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Weight

The gravitational force that acts on an object due to its mass: W=mg

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Momentum

The product of the mass and velocity of an object: p=mv

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Principle of conservation of momentum

Momentum is always conserved in a closed system. Total momentum before = Total momentum after

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Moments

The turning effect of a force. Force multiplied by the perpendicular distance from the line of action of the force to the point: Moment=Fx

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Principle of moments

For an object in equilibrium, the sum of anticlockwise moments about a pivot is equal to the sum of clockwise moments

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Centre of gravity

The point at which gravity appears to act

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Uniform object

Centre of gravity is exactly at its centre

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Work

The force causing a motion multiplied by the distance travelled in the direction of motion: W=FΔs

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Kinetic energy

The energy an object has due to its motion

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Gravitational potential energy

The energy an object has due to its position in a gravitational field

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Principle of conservation of energy

Energy cannot be created or destroyed, only transferred from one form to another

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Power

The rate of energy transfer

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Efficiency

A measure of how efficiently a system transfers energy