Ch 10: Force, Work, Power Flashcards Preview

Kinesiology > Ch 10: Force, Work, Power > Flashcards

Flashcards in Ch 10: Force, Work, Power Deck (15)
Loading flashcards...
1
Q

What is the def of force?

A

That which pushes or pulls through the force of gravity to alter the motion of an object.

2
Q

Internal and external causes of force?

A

internal: muscles
external: gravity, other objects, friction

3
Q

Force equation

A

force = mass x accel

4
Q

Must produce a greater what in order to lift something?

A

must produce a greater force than gravity

5
Q

A vector has what three things?

A

magnitude
direction
point of application

6
Q

a change in magnitude means what?

A

force applied

7
Q

a chance in the point of application means what?

A

where the force is being applied

ex: pushing instead of pulling

8
Q

Momentum equation

A

momentum = mass x velocity

9
Q

newton’s law of reaction

A

for every action, there is an equal and opposite reaction

10
Q

what is the def of work?

A

when force is overcome for a given distance

11
Q

work equation

A

work = force x displacement

12
Q

difference between positive and negative work

A

positive force: same direction as movement (concentric)

negative force: opposite direction as movement (eccentric)

13
Q

power definition

A

the rate at which work is done

14
Q

power equation

A

power = work / time

-or-

power = force x displacement / time

-or-

power = force x velocity

15
Q

velocity equation

A

displacement / time

-or-

velocity = power / force