P5 Flashcards
Types of quantities
And examples
Scalar- just a number
e.g. mass, distance, speed
Vector- number and direction
e.g. weight, velocity, acceleration, force
Resultant force
is the overall force on a point or object
Equation for weight
W= M x G
W= Weight (N) M= Mass (Kg) G= Gravity (N/Kg)
Equation for work
W= F x S
W= Work (J) F= Force (N) S= Distance (M)
1J= ?Nm
1Nm
Hooke’s law
F = K x E
F= Force (N) K= Spring Constant (N/M) E= Extension (M)
Kinetic energy equation
Ek= 1/2 x M x V²
Ek= Kinetic energy (J) M= Mass (Kg) V= Velocity (m/s)
Liquids and Gases
Which is compressible which is incompressible?
Compressible= gas Incompressible= liquid
Pressure equation
P= F/A
P= Pressure (N/m) F= Force (N) A= Area (M²)
Distance equation
S= V x T
S= Distance (M) V= Speed (m/s) T= Time (S)
How to find the distance travelled through a graph?
Area under the graph
Acceleration equation
A= ΔV/T
A= Acceleration (m/s²) ΔV= Change in velocity (m/s) T= Time (s)
Final velocity equation
V²-U² = 2 x A x S
V²= final velocity (m/s) U²= initial velocity A= acceleration (m/s²) S= distance (m)
What is inertia?
An object that is in motion will remain in motion, unless acted on by an outside force
The law of conservation of energy?
Energy is never created or destroyed it is only turned into something else
Newtons 3rd law
For every action there is an equal and opposite reaction
Newtons 1st law
an object will remain at rest or in uniform motion in a straight line unless acted upon by an external force.
Newtons 2nd law
The acceleration of an object is directly proportional to the magnitude of the net force.
Force equation
F = M x A
F= force (n) M= mass (kg) A= acceleration (m/s²)
Stopping distance = …
Thinking distance + breaking distance
Factors effecting thinking distance
- drink
- drugs
- tiredness
Factors effecting breaking distance
- condition of tyres
- condition of road
- weight of car
Momentum equation
P = M x V
P= momentum (kg m/s) M= mass (kg) V= velocity (m/s)
The law of conservation of momentum
Momentum is always conserved
momentum before = momentum afterwards
Forces can be…
Contact= when two objects have to be touching for a force to act. eg. friction, air resistance, tension etc.
Non contact= if the objects do not need to be touching for the force to act. eg. gravitational force, magnetic force etc.
