Deffinitions Flashcards
(29 cards)
Centre of mass
Is the point of an object which its mass can be thought of as being concentrated
Scalar
Quantity only. Distance, speed, volume, length, width and time
Vector
Has both a quantity and and a direction. Displacement, velocity, acceleration
Contact force
Push or pull to open door. Friction. When forces come in contact
Non contact force
Gravity magnetic electrostatic
Newtons first law
A body will remain at rest, or move with a constant speed until a force acts on it.
Balanced force
The object will not move, or move at a constant speed
Unbalanced forces
Object will speed up or slow down
Newtons second law
The acceleration of an object is directly proportional to the resultant force of an object and inversely proportional to the mass of an object
Hooke’s law
The extension of a spring is directly proportional to the force applied, as long as the limit of proportionality isn’t exceeded
Wight
Force of gravity acting on an object
Terminal velocity
The maximum velocity a falling object can travel at in a fluid
Thinking distance
The distance you travel during your reaction time
Momentum
All moving bodies have momentum, dependant on the mass of the object and how fast its moving
Conservation of energy
Light, sound, thermal, electrical, nuclear, kinetic, elastic potential, gravitational potential and chemical
Energy can not be
Created or destroyed
Energy can be
Transferred from one store to another
Work done
Work is done when a force moves an object through a distance
Gravitational potential energy
Is the energy that a body has due to its height above the ground
Temperature
A measure of average kinetic energy of particles of an object
Energy transfer
Change of energy from one energy store to another
Specific heat capacity
The energy needed to raise the temperature of 1kg of a material by 10c
Fibre glass
Keep warm air in and cold air out
Cavity wall insulation
Used to reduce heat loss between walls, done by filling air space with materials like (wool or expanding foam)
