Linear Energy 6B Flashcards
Work (U)
Equal to the change in the object’s energy
Q
Heat lost from friction and sound
What does work look at?
All external forces except from gravity and those that go into Q
Work=____ + Q
Mechanical Energy (ME)
What gets added back into the work equation even though it can be “lost”
Q
Always positive
Work-Energy relationship
The average force required to raise and lower an object will equal the object’s weight (+W)
The average force to horizontally
move an object will be equal to what?
0
What happens to the work required to lift an object when there is some frictional force?
Increases the work
More (+) work since the frictional force opposes the weight
What happens to the work required to lower an object when there is some frictional force?
Decreases the work
Less (-) work since the frictional force “helps” us
What happens to the work required to lift an object if the velocity isn’t zero at the end?
More work
What happens to the work required to lower an object if the velocity isn’t zero at the end?
Less work
What three factors improve your vertical jump performance?
- Increasing GRF
- Decreasing mass
- Increasing displacement which also increases time
During giving/follow through, how does force and displacement alter to equal work done?
Force decreases during follow through which increases the displacement/time
Elastic energy
AKA potential strain energy
Stored energy in an object when it’s stretched, compressed, or otherwise deformed and can be released when the object returns to its original shape.
How do you find work on a graph from Hooke’s law?
Are under the Force/delta x curve
The average force required to raise/lower an object is equal to what?
Its weight
True or false:
We are mainly concerned with the magnitude of the displacement, not +/- values
True
Average force (FHx) equation
F=(1/2)(k)(delta x)
