# OCR A level Physics Flashcards

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- Created by: Bananaexcel 2.0
- Created on: 21-06-18 19:55

Resultant force

a single force which has the same effect as the sum of all the forces acting on the body

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Newton

the force that causes a mass of 1kg to have an acceleration of 1ms^-2

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Terminal velocity

when the upwards force becomes equal to the weight of a falling object which cause it's resultant force to be zero

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Equilibrium

when all the forces acting on an object (coplanar forces, acting on the same plane) are balanced

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Moment of a force

the product of a force and the perpendicular distance of its line of action

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Principle of moments

the sum of the clockwise moments is equal to the sum of the anticlockwise moments

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Conditions for equilibrium to take place

resultant force = 0 //principle of moments

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Couple

when two equal, antiparallel forces act to produce a rotation

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Torque

the product of one of the forces of a couple and the perpendicular distance between them

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Centre of mass

the single point at which all the mass of the object can be assumed to be situated

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Density

mass per unit volume // kgm^-3

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Archimedes' principle

the upward buoyant force exerted on the object immersed in a fluid is equal to the weight of the fluid that the object displaces

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Work

the product of the force and the distance moved by the force i the direction of movement

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Principle of conservation of energy

the total energy of a closed system remains constant, energy cannot be created or destroyed. Only transferred from one form to another.

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Power

rate of doing work // watts

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Elasticity

property of a body to resume it's original shape/ size once the deforming force has been removed

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Deformation

the change in shape or size of the object // elastic = returns to original shape // plastic = remains in new state

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Hookes' Law

the extension of an object is proportional to the force that cause it, provided the elastic limit is not exceeded

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Stress

force per unit cross-sectional area //Nm^-2 or Pa

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Stress

extension per unit length

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Ductile

material can be drawn into wires and will show plastic deformation under tensile stress before breaking

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Malleable

material can be hammered or beaten into flat sheets and will show extensive plastic deformation when subjected to compressive forces

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Brittle

will break with little or no plastic deformation

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Hard

will resist plastic deformation by surface indentation or scratching

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Stiffness

property: resist tensile forces

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Polymeric material

made up of long chain molecules called polymers

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Ultimate tensile strength

maximum stress a material can handle while being pulled or stretched before it breaks

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Newtons' First Law

A body will remain at rest or constant velocity unless an external force acts on it

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Newtons' Second Law

The resultant force of an object is proportional to the rate of change of momentum of the object, and the momentum change takes place in the direction of the force

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Newtons' Third Law

If object A exerts a force on object B, object B will exert an equal and opposite force on object A

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Principle of conservation of momentum

the total momentum before a collision is always equal to the total momentum after the collision, provided that no external forces act on it

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e.m.f

Electromotive supply: a supply of energy gained per unit charge by charges passing through

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p.d

the energy transferred per unit charge by the charges passing through the component

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Ohms' law

the current through the conductor is directly proportional to the p.d, provided that the temperature remains constant

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1kWh

3600 000J

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Conservation of charge (Kirchhoff's first law)

the algebraic sum of the charges in a circuit must equal zero

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Kirchhoffs' second law

the e.m.f provided by the cell must be the same as the total drop in pd across all of the resistors in a loop

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Internal resistance

(in a source of e.m.f) is the resistance to electric current of the materials inside

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Intensity of a wave

the rate at which energy is transferred from one location to another

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Plane-polarised wave

oscillations of the field and the direction of travel are confined to a single plane

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Polarising filter

produces plane polarised light by selective absorption of one component of the incident oscillations - the filter transmits only the component of light polarised perpendicular to that direction

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Quantum

a small discrete unit of energy

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Electronvolt

the KE gained by an electron when it accelerates through a p.d of 1 volt

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Work function (of a metal)

minimum amount of energy required to just release an electron from its surface

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## Other cards in this set

### Card 2

#### Front

the force that causes a mass of 1kg to have an acceleration of 1ms^-2

#### Back

Newton

### Card 3

#### Front

when the upwards force becomes equal to the weight of a falling object which cause it's resultant force to be zero

#### Back

### Card 4

#### Front

when all the forces acting on an object (coplanar forces, acting on the same plane) are balanced

#### Back

### Card 5

#### Front

the product of a force and the perpendicular distance of its line of action

#### Back

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