Work
Work-Energy Theorem
Power
Kinetic Energy
Potential Energy
100
Work Formula
w=fd
work= force x displacement
100
Work Energy Theorem Formula
Wnet= Fnetd = ½ mvf2 - ½ mvi2
100
The rate at which work is done is _____.
Power
100
Kinetic Energy Formula
½ mv2
1/2 x mass x velocity2
100
Potential Energy Formula
mgh
mass x gravitational field x height
200
SI unit for Work
Joules
200
The work-energy theorem states that the net work done by the forces on an object equals the _____________.
Change in Kinetic Energy
200
Power formula
P= w/t
power= work / time interval
200
the net work done by all forces acting on an object is ___________
Change in Kinetic Energy
200
The stored energy in a spring is _________.
Elastic potential Energy
300
Amy uses 20N of force to push a lawn mower 10 meters. How much work does she do?
200 J
300
A 2.0 kg book is accelerated from 2.0 m/s to 4.0 m/s as it is pulled across a table. What is the amount of work needed to accelerate the book to the nearest tenth of a joule?
12.0 J
300
SI unit for Power
Watts (W)
300
Kinetic Energy os associated with an object’s _____ and _____.
mass , velocity
300
What is the potential energy of a 3 kg ball that is on the ground?
The potential energy is 0.
400
When the force has a component that is in the same direction as the displacement, the work done by that force is _______.
Positive
400
A 2 kg ball is dropped from a height of 10 m. Calculate the work that has been done on the ball between the moment it is released and the moment when it hits the ground. Assume that air resistance can be neglected.
196 J
400
Power Formula #2
P=Fv
Power= Force x speed
400
You serve a volleyball with a mass of 3.1 kg. The ball leaves your hand at 45 m/s.
3138.75J
400
The potential energy of an apple is 4.5 joules. The apple is 5 m high. What is the mass of the apple?
0.09 kg
500
When the force has a component that is in the opposite direction of the displacement, the work done by that force is ______.
Negative
500
A car of mass 500 kg traveling at a speed of 16 m/s applies the car’s brakes at some point. The car’s brakes provide a frictional force of 4000 N. Determine the stopping distance of the car.
16 m
500
Two horses pull a cart. Each exerts a force of 250.0 N at a speed of 2.0 m/s for 10.0 min. What is the power delivered by each horse.
500 W
500
Which point has the most kinetic energy?
Point B
500
At what height is an object that has a mass of 85kg, if its gravitational potential energy is 3700J?
0.45 m