Physics 3.3 Flashcards
1
Q
What is the equation for work done and its standard unit?
A
Work done=force parallel to motion * distance parallel to the motion
-The standard unit is a joule which is equal to one Nm so one joule is transferred when a 1N force causes an object to be moved 1m
2
Q
Difference between work and work done?
A
-Work is scalar whereas work done is a vector quantity
3
Q
What is the conservation of energy principle?
A
-The total energy of a closed system is constant and energy cannot be created nor destroyed only transferred.
4
Q
Define Power?
A
-Power is the rate of doing work and is measured in Watts or Joules per second
5
Q
What are two equations for Power?
A
-Power=work done/time taken
-Energy=Power* time