Work
The standard unit for work is ?
Joule (J)
What is the formula for Work-Energy Theorem?
Wnet=1/2mv^2−1/2mv^2/0
What is the SI unit for power?
Watt (W) or (J/s) Joules per second
What is the formula for Kinetic Energy?
KE=1/2 m v^2
Standard Unit for Potential Energy
Joule (J)
Work equals force times what?
Distance
Energy - Work Theorem states that the Net work done by the forces on an object equals the change in its(blank blank)
Kinetic Energy
Power equals?
Work done divided by the time interval.
What energy when released creates Kinetic Energy?
Potential Energy
Gravitational potential energy formula
GPE= mass* g* height
When is negative work being done?
Negative work is done when the force has a component against or in the opposite direction of the displacement.
When can the Work - Energy theorem be applied?
When we know the motion of an object but the value of one or more of the forces acting on the object are unknown.
Another way to calculate power is force times(blank).
Velocity
A hairball has a mass of 2kg , suppose it travels at 10 m/s. Find the kinetic energy it has.
KE=1/2 (2kg) (10 m/s)^2
KE= 100J
How does potential energy differ from kinetic energy?
Potential energy is energy stored while kinetic is energy of motion.
Is work a vector or scalar quantity? And why is it only one?
A scalar quantity because it has no direction, only a magnitude.
Who made the Work- Energy Theorem? Hint: Last name is SI unit for Work.
James Joule
Is power a scalar or vector quantity and why is it only one?
Power has no direction therefore it is a scalar quantity.
KE= 1/2(150kg)(1050m/s)^2
KE= 78,750J
What is the potential energy of a 4kg orange cat on top of a 3 meter high bookshelf?
GPE= (4kg)(9.8m/s)(3m)
GPE=117.6J
A soccer player kicks a ball with a force of 10 N. The ball travels for 30 meters. What is the total work?
W= 300 Joules
It traveled 4m
For an elevator to go from the top to bottom of a building it takes 950000J of Work. If the elevator takes 50 seconds to go up. How much power does the elevator used to go up?
P= 950000J/50s
P= 1900W
What are the 5 main types of Kinetic Energy?
Mechanical, thermal, electrical, sound, and radiant energy.
5 main types of potential energy
Elastic, chemical, nuclear, gravitational, and thermal energy.