Work/Power
A 20N force pushes an 10kg mass 1.5m. How much work is done?
30J
Gravitational Potential energy depends on these 3 things?
mass, gravity, and height
This is the unit for energy?
Joule
What is the K for a spring that has been stretched out 0.3m using a force of 10N?
33.3N/m
The conservation of energy says that this will always remain constant?
Total energy
This is the unit for power?
Watts
This shows the relationship between the displacement of a spring, the force, and the spring constant?
Hooke's Law
This allows objects to do work?
energy
A 2000kg car is traveling at 50m/s, what is the KE?
2,500,000J
When something falls, the GPE is decreasing, what two quantities are increasing?
KE and velocity
2 people do the same work, who had more power?
The one who did it faster (in less time)
When the velocity of an object is doubled, the KE will?
quadruple (x4)
A bowling ball and a golf ball are both dropped from the second story of a building, which one has more KE right as they are hitting the ground?
bowling ball
How much power is needed to move a car 10m with a force of 300N if it takes 3 minutes to move the car?
16.67W
A ball on top of a roof has 200J of GPE, then it falls off the roof. How much KE does it have when it is halfway to the ground?
100J
In order to do work on an object, the force and the distance traveled must be?
parallel
What happens to the spring constant of a spring if we push with more force on the spring?
the spring constant stays the same, regardless of the force
True or False: If an object is moving, work is always being done?
False, if an object is not moving parallel to the force, then there is no work being done. (carrying the book like a waiter)
A spring is stretched out 0.04m when a force of 400N is placed on it, what is the EPE generated?
8J
If the KE of a moving object decreases by 35J, what could possibly be happening to the objects height?
it is getting higher (velocity is getting less)
The fact that work involves distance and not displacement, makes it this type of quantity?
a Scalar quantity
This is the term that describes both "potential and kinetic energy"
Mechanical energy
A 0.3kg toy car is pushed against a spring that has a spring constant of 15N/m. The spring is compressed 0.2m. When the car is released, what will its velocity be?
1.4m/s
If a 2kg rock falls off a 40m cliff, what is the rocks velocity right as it hits the ground?
28m/s
If the KE of a 3.5kg moving increases from 0 to 225J as it falls, what height did it fall from?
6.6m