Work. Physics 11. Comprehension Check. What is the impulse given to a golf ball of mass 45.9g if it starts at rest and attains a final velocity of 35m/s? If the golf ball in problem 1 was in contact with the golf club for 0.027s, what force acted on the golf ball?
Work is the transfer of mechanical energy (total kinetic and potential energy).
Work is done only if an object moves.
When the work is done upon the object, that object gains energy
Work is only done on an object when the force and displacement are in the same direction.
The symbol is W
Units: Joule (J)
1 J = 1 Nm
Work is a scalar***
Positive work occurs when the angle between the force and displacement is 0°-90°
“Negative work” occurs when the angle between the force and displacement is 90°-180°