p = mv
momentum is a vector (because velocity is a vector)
Δp α F(resultant) Δp Impulse = Δp
The impulse of a force is equal to the change in momentum of a body which a force causes.
Impulse = F x Δt
Conservation of Momentum
Momentum is ALWAYS conserved.
Conservation of Energy
Energy cannot be created or destroyed, it can only be transferred from one form to another.
There are 2 types of collision
- KE is conserved - KE is NOT conserved
Degrees x π/180 --> Radians
Radians ÷π/180 --> Degrees
Angular velocity - the angular speed of an object in a particular direction
ω = θ/t v = rω
ω = 2π/T
where; ω = angular velocity (rad s-1)
t = time T = period r = radius
F = mv2/r
where m = mass v = velocity r= radius
other formula to be aware of:
a = rω2 where a = acceleration
substitute in to centripetal force equation;
F = mrω2 where F = force
If a charged object is placed in an electric field it will experience a force.
This states that the force of attraction or repulsion between two point charges is equal to k (constant in formula book) multiplied by (charge 1 x charge 2) divided by the radius2. A point charge has a radial field. Uniform field is produced by two parallel plates. From POSITIVE to NEGATIVE.
Electric Field Strength (E): the force that a charged particle will feel i.e. how tightly packed the field lines are.
Charge (Q): Charge on a particle in coloumbs.
F = EQ E = F/Q UNITS: NC-1
Using F = ma, we can say F= F and that a = EQ/m
UNIFORM Electric field strength (E): a measure of how rapidly the potential changes.
E = V/d UNITS: Vm-1
where V = potential difference d = distance over the potential difference
The distance will be the same throughout a uniform field as the lines are parallel to each other. Therefore, in a uniform field, the firld strength will be the SAME AT ALL POINTS.
*Permittivity of free space: measure of how easy it is for electric field to pass thru space = Є0