work done and power Flashcards
(fill the gaps)
An … is said to have … when it … (…) energy
An object is said to have done work when it transfers (uses) energy
unit for work done
J - joules
The work done by an object is … to amount of energy it …
the work done by an object is equal to amount of energy it transfers
equation for work done
work done = force x distance
unit for force
N - newtons
unit for distance
m
what is power?
power is the amount of work done or energy transferred in a given time
equation for power
power = work done
——————–
time
unit for power
W
unit for energy
J
what does a moving object have?
momentum
what is momentum?
tendency of the object to keep moving in the same direction
what 2 factors does momentum mean?
momen (velocity) - tum (mass)
equation for momentum
momentum = mass x velocity
(kg m/s) (kg) (m/s)
P = m X v
it is … to change … of … of an object with a lot of momentum
it is difficult to change direction of movement of an object with a lot of momentum
