# Physics

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.

### Card 4

#### Front

Velocity is the rate of change of displacement .

### Card 5

#### Front

Acceleration is the rate of change of velocity.