Linear Work and Power

Question 1

Joules

Answer 1

Newtons x meters

Question 2

Is work a scalar or vector value?

Answer 2

Scalar

Question 3

How do you find work on a graph?

Answer 3

Area under force vs displacement curve

Question 4

How does the BB bicep curl profile change when performed faster or slower?

Answer 4

Non-linear changes in acceleration transfer to the forces

Question 5

What is important to note in quasi-static BB curl movement?

Answer 5

So slow that the acceleration can be ignored in the EOM

Question 6

How does the BB bicep curl profile change if the subject had a longer or shorter forearm?

Answer 6

Linear changes in acceleration transfer to the forces

Question 7

How does the BB bicep curl profile change if the BB mass is increased/decreased?

Answer 7

Will Oscillate around the new W in y
Adjust hills and valleys LINEARLY

Question 8

When cos(angle)<90

Answer 8

Positive work

Question 9

When cos(angle)=90

Answer 9

No work

Question 10

When 90<cos(angle)<180

Answer 10

Negative work

Question 11

You are given the average force in cartesian form and its displacement in cartesian form. Explain how to find how much work is performed in the x and y direction?

Answer 11

1. Multiply the x and y components (force times displacement)
2. Add the x and y totals together to find work done

Question 12

What is the work during the UP phase?

Answer 12

+

Question 13

What is the work during the DOWN phase?

Answer 13

-

Question 14

What is the work during the ENTIRE movement?

Answer 14

0

Question 15

How would the amount of work over the entire up phase change if the exercise was performed faster/slower?

Answer 15

No change

Question 16

How would the amount of work over the entire up phase change if the exercise was performed with longer/shorter forearms?

Answer 16

Change due to the displacement term

Question 17

How would the amount of work over the entire up phase change if the exercise was performed with a greater/lesser barbell mass?

Answer 17

Change due to force term

Question 18

What is power measured in?

Answer 18

Watts (J/s)

Question 19

Power is what type of product?

Answer 19

Scalar dot product

Question 20

What is the average power during the up phase of a bicep curl?

Answer 20

+

Question 21

What is the average power during the down phase of a bicep curl?

Answer 21

-

Question 22

What is the average power during the entire bicep curl?

Answer 22

0

Question 23

What is the average force generated during horizontal and vertical motion of a bicep curl?

Answer 23

Horizontal average force- 0
Vertical average force- (+)

Question 24

What is the average velocity generated during horizontal and vertical motion of a bicep curl during the up phase?

Answer 24

Horizontal average velocity- (+)
Vertical average velocity- (+)

Question 25

What is the average velocity generated during horizontal and vertical motion of a bicep curl during the down phase?

Answer 25

Horizontal average velocity- (-) Vertical average velocity- (-)

Question 26

What is the average velocity generated during horizontal and vertical motion of the entire bicep curl?

Answer 26

0

Question 27

How would the power over the entire up phase change if the exercise was performed faster/slower?

Answer 27

There would be a change *Increases or decreases*

Question 28

How would the power over the entire up phase change if the exercise was performed with longer or shorter forearms?

Answer 28

There would be a change Longer- increased power/work Shorter- decreased power/work

Question 29

How would the power over the entire up phase change if the exercise was performed with a greater or less barbell mass?

Answer 29

There would be a change Greater- more power Lesser- less power

Question 30

Type of contraction when force and power are in same direction

Answer 30

Concentric contraction

Question 31

Type of contraction when force and power are in different directions

Answer 31

Eccentric contraction

Question 32

Type of contraction when there is a force but no power

Answer 32

Isometric contraction