Work, Energy, Power

Question 1

What is Work?

Answer 1

physical work is the product of force times the displacement through which that force moves a load
- work can either be positive or negative and even zero

Question 2

Eccentric Contraction

Answer 2

• negative work

- example: the descent of the squat, the quads produce a force and lengthen

Question 3

Concentric Contraction

Answer 3

• positive work

- example: the ascent of the squat the quad produces a force and shortens

Question 4

isometric contraction

Answer 4

is where the muscle produces a force, but does not shorten or lengthen

Question 5

What are the units for work?

Answer 5

Joules of N.m

Question 6

Define energy?

Answer 6

energy is the ability to do work

Question 7

what are the 3 types of mechanical energy?

Answer 7

1. Kinetic Energy
2. Gravitational Potential Energy
3. Elastic Potential Energy (strain energy)

Question 8

Define Kinetic energy?

Answer 8

energy a body of object has because its motion

Question 9

Define gravitational kinetic energy?

Answer 9

energy a body has due to its height, potential fall

Question 10

Define Elastic Potential Energy (strain energy)

Answer 10

ability of a body or object to do work while it recoils (reforms) after being deformed (stretched, compressed, or twisted)

Question 11

Define Power

Answer 11

the rate of doing work or the product of forces times the velocity at which that force is applied

Question 12

what units are used for power

Answer 12

watts