# Physics

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- Created by: xsxhxaxrxoxnx
- Created on: 06-09-13 10:49

Define Scalar Quantities

Scalar quantities are physical quantities that have only magnitude.

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Define Vector Quantities

Vector quantities are physical quantities that both magnitude and direction.

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Define Speed

Speed is the distance travelled per unit time.

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Define Velocity

Velocity is the rate of change of displacement .

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Define Acceleration

Acceleration is the rate of change of velocity.

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State Newton's 1st Law of Motion

Every object will continue in its state of rest or uniform motion in a straight line in the absence of a net force acting on it.

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State Newton's 2nd Law of Motion

The net force acting upon an object is equal to the product of the mass and the acceleration of the object; the direction of the force is the same as that of the object's acceleration. (Fnet = ma)

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Define Newton

One newton is defined as the force required to produce an acceleration of 1m/s2 in a body with a mass of 1kg.

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State Newton's 3rd Law of Motion

For every action, there is an equal but opposite reaction.

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Define Friction

Friction is a contact force that opposes or tend to oppose motion between surfaces in contact.

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Define Mass (scalar)

Mass is the measure of the amount of matter/substance in a body.

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Define Weight (vector)

Weight is the amount of gravitational force acting on an object.

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Define Gravitational Field

The region in which a mass experiences forces due to gravitational attraction is called gravitational field.

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Define Gravitational Field Strength

Gravitational field strength g is defined as the gravitational force acting per unit mass on an object.

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Define Inertia

Inertia is the reluctance of the object to change either its state of rest or motion.

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Define Density

Density is defined as a substance's mass per unit volume.

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Define Moments (turning effect)

Moment of a force is the product of the force (F) and the perpendicular distance (d) from the pivot to the line of action of the force.

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State the Principle of Moments

When a body is in equilibrium, the sum of clockwise moments about a pivot is equal to the sum of anticlockwise moments about the same pivot.

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Define Centre of Gravity (CG)

The centre of gravity of any object is defined as the point through which its whole weight appears to act.

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Define Stability

Stability is a measure of a body's ability to return to its original position after is has been tilted slightly.

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Define Energy

Energy is the capacity to do work.

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Define Elastic Potential Energy, Gravitational Potential Energy and Kinetic Potential Energy.

Elastic potential energy is the energy a body possesses when it is strained. Gravitational potential energy is the energy a body possesses because of its position relative to the ground. Kinetic energy is the energy of a body due to its motion.

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State the Principle of Conservation of Energy

Energy cannot be created or destroyed. Energy can only be converted from one form to another. The total energy in an isolated system is constant.

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Define Joule

One joule of work is done when a force of one newton moves an object through a distance of one metre in the direction of the force.

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Define Work Done.

Work done is when a force applied to an object produces motion in the direction of the applied force.

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Define Power

Power is defined as the rate of doing work.

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Define Temperature

Temperature is a measure of how hot or cold a body is in terms of Kelvin (K).

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Define Heat

Heat is the amount of thermal energy that is transferred from a hotter region to a colder region.

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Define Pressure

Pressure is the force acting normally or perpendicularly per unit area.

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## Other cards in this set

### Card 2

#### Front

Vector quantities are physical quantities that both magnitude and direction.

#### Back

Define Vector Quantities

### Card 3

#### Front

Speed is the distance travelled per unit time.

#### Back

### Card 4

#### Front

Velocity is the rate of change of displacement .

#### Back

### Card 5

#### Front

Acceleration is the rate of change of velocity.

#### Back

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