Physics
Define 'Work Done'
The product of the force & the distance travelled in the direction of the force
Define 'Power'
The rate of energy transfer
State what condition needs to occur for you to use the Power = Force * Speed equation
The force must be constant
Give the equation for distance with the SUVAT equation assuming u = 0
s = v² / (2*a)
Define 'GPE'
The capacity for doing work as a result of an objects position in a gravitational potential field
State the 'Conservation of energy principle'
Energy can be stored or transferred, but never created or destroyed
Give both efficiency equations
- Useful energy output/ Total energy input
- Useful power output/ Total power input
Give the equations for work done
W = F * x
W = F * Cosθ * x
F - force
x - Parallel distance
State Newtons First Law
An object will remain stationary or move at a constant velocity unless acted upon by a resultant force
State Newtons Second Law
The resultant force of a body is directly proportional to its rate of change of momentum
State Newtons Third Law
When two object exert a force on each other, the force they exert on each other are equal and in opposite directions and they're of the same type
Define Momentum
The mass of a body multipled by its velocity
Define momentum of a force
1n is needed to accelerate 1kg of mass at 1ms^-1
State the principle of conservation of momentum
For a system of interacting objects, the total momentum in a specified direction remains constant, as no external forces act on the system
Give the formula for momentum
p = mv
p - momentum
m - mass
v - velocity
Give the formula for change in momentum
Δp = mv - mu
Δp - change in momentum
m - mass
v - final velocity
u - initial velocity
Define impulse
The impulse of a force is equal to to change in momentum
Give the formula for Impulse
Δp = F * Δt
Δp - Impulse
F - Force
Δt - Change in time
How do you find impulse on a force time graph
Calculating the area underneath the graph
Define 'Elastic collision'
No momentum or kinetic energy is lost during the collision, both quantities are conserved before and after the collision
Define 'Inelastic collision'
Momentum is conserved but kinetic energy is lost during the collision