work and power

Question 1

Define Work
2. Define Power
3. Define Energy
4. Law of Conservation of Mechanical Energy
5. Work-Energy Relationship

Answer 1

w=fxd

Question 2

What is Work?

Answer 2

From a mechanical perspective, work is defined as the
force applied against a resistance multiplied by the
displacement in the direction of that force
W = F x d
can be negative or positive
work is defined by force over a distance so *** a person on a treadmill does not theoretically do work because they are stationary

Question 3

what is power?

Answer 3

Power
Power is the amount of mechanical work performed in a
given time
Power is “how quickly or slowly the work is done”
“the rate of doing work”
-P = Work
∆ time
-P = Fd
∆ t

Question 4

2 types of energy what are they?

Answer 4

Energy
Energy is defined as the capacity or ability to do work
* Forms: light, heat, nuclear, electrical and mechanical
We are concerned with two types of mechanical energy:
1. Kinetic energy (KE)
2. Potential Energy (PE

Question 5

what is negative work?

Answer 5

Negative Work
* Negative work is done when the object moves in an
direction opposite to the force that is acting on it
* ie. eccentric contraction
it is in the opposites direction

Question 5

define positive work

Answer 5

Positive work is done when the object moves in the
same direction as the force that is acting on it
* ie. concentric contraction