work done and power Flashcards
work done
is a measure of the amount of energy transferred through a distance
what is the equation for work done
E = f x d
what does e stand for in the work done equation
work dones because the workdone by an object is equal to the amount of energy that is transfers
what is the unit for energy/ work done
joules
what is the unit for forces
Newtons
what is the unit for distance
meters
what is the equation for power
p = E/t
what is the unit for power
watt
name 6 contact forces
- friction
- air resistance
- upthrust - only happens in water
- tension - pull force
- water resistance
- normal contact force
name 3 non contact forces
- gravitational forces
- magnetic force
- electrostaic
what is a moment
the turning effect of a force
equation for moment
moment = force x distance
what is the units for moment
Nm
what does equillibrum
when a situatuon is not changing because all things affecting ut are balanced
when a system involving rotation force is in equilibrium what is the equation
the sum of clockwise moments = the sum of anticlockwise moments
what are leavers
leavers transmit the turning effect of a force,making it easier to do work, leavers increase the distance between the pivot and your effort, creating a large momentum
what is load force
the weight of the objecy being lifted
what is the effort
the force applied to the leaver by the person
what direction does weight go down
down
