# Mechanics

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- Created by: Jade
- Created on: 09-01-13 15:29

Pico (p)

10^12

1 of 61

Nano (n)

10^-9

2 of 61

Micro (mew)

10^-6

3 of 61

Milli (m)

10^-3

4 of 61

Centi (c)

10^2

5 of 61

Kilo (k)

10^3

6 of 61

Mega (M)

10^6

7 of 61

Giga (G)

10^9

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Tera (T)

10^12

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Scalar Quantity

Has magnitude but no direction

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Vector Quantity

Has magnitude and direction

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Average Speed

A measure of the total distance travelled in a unit time

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Displacement

Distance moved in a gived direction

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Velocity

Displacement per unit time

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Intantaneous Speed

The speed as a given instant of time

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Acceleration

Rate of change of velocity

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Newton

One newton si the force that causes a mass of one kilogram to have an acceleration of one metre per second every second

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Weight

Gravitational force on a body

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Moment

The moment of force is the force multiplied by the perpendicular distance from a stated point

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Density

Is defined as mass per unit volume

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Pressure

Is defined as force per unit area

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Kinetic Energy (car safety)

Breacking force multiplied by the braking distance

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Joule

1 joule is the work done when a force of 1 newton moves its point of application 1 meter in the direction of the force

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Energy

Is the stored ability to do work

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Conservation of Energy

Describes the situation in any closed system, where energy may be converted from one form into another, but cannot be created or destroyed

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Kinetic Energy

Is the work an object can do by virtue of its speed

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Potential Energy

Regions where electric, magnetic, gravitational and nuclear forces exist. Regions such as this are known as fields

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Chemical Energy

Energy can be released when the arrangement of atoms is altered

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Internal Energy

The molecules in all objects have random movement and have some potential energy when they are close to one another, This type of energy is often called heat energy

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Nuclear Energy

Energy can be released by reorganising the protons and neutrons in an atom's nucleus. This form of energy is also know as atomic energy

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Gravitational Potential Energy

Is energy stored in an object by virtue of its position in a gravitational field

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Power

Is the rate of doing work

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Watt (W)

One watt (W) is equal to one joule per second

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Stress

Is force per unit cross-sectional area

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Strain

Is extension per unit length

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Acceleration of Free Fall (g)

The acceleration of a body falling under gravity

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Amount of a Substance

SI Unit measured in moles

37 of 61

Breaking Distnace

The distance a vehicle travels while decelerating to a stop

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Brittle

A material that distorts very little even when subject to a large stress and does not exhibt any plastic deformation

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Centre of Gravity

The point at which the entire weight of an object can be considered to act

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Compressive Force

Two or more forces that have the effect of reducing the volume of the object on which they are acting, or reducing the length of the string

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Couple

Two forces that are equal and opposite to each other but not in the same straight line

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Crumple Zone

An area of a vehicle designed to increase the distance over which the vehicle decelerates and so reduce the average force acting

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Ductile

Materials that have a large plastic region

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Elastic Deformation

The object will return to its original shape when the deforming force is removed

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Elastic Limit

The pount at which elastic deformation becomes plastic deformation

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Extension

The change in length of an object when subjected to a tension

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Force Constant (k)

The constant of proportionality in Hooke's Law measured in newtons per metre

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Global Positioning System

A network of satellites used to determine an object's postition on the earths surface

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Hooke's Law

The extension of an elastic body is proportional to the force that causes it

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Moment of a Force

The turning effect due to a single force, calculated from the force multiplied by the perpendicular distance from a given point

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Plastic Deformation

The object will not return to its original shape when the deforming force is removed, it becomes permanently distorted

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Principle of Moments

For a body in rotational equilibruim the sum of the clockwise moments are equal to the sum of the anticlockwise moments

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Stopping Distance

The sum of the thinking distance and the braking distance

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Tensile Force

Usuall two equal and opposite forces acting on a wire in order to stretch it

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Tensile Stress

The tensile force per unit cross-sectional area

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Thinking Distance

The distance travelled from seeing the need to stop to applying the brakes

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Torque

The turning effect due to a couple measured in newton metres

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Turning Forces

One or more forces that if unbalanced will cause rotation

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Ultimate Tensile Strength

The maximum tensile force that can be applied to an object before it breaks

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Work (W)

The product of force and the distance moved in the direction of the force, it can also be considered as the energy converted from one form into another, measured in joules

61 of 61

## Other cards in this set

### Card 2

#### Front

10^-9

#### Back

Nano (n)

### Card 3

#### Front

10^-6

#### Back

### Card 4

#### Front

10^-3

#### Back

### Card 5

#### Front

10^2

#### Back

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