Kinetics

Question 0

Type, location, magnitude, direction, and rate of motion/ change determine and describe what?

Answer 0

Motion.

Question 1

What are kinetics?

Answer 1

forces within the body and outside the body that affect how the body moves.

Question 2

When you drop you pen or roll a ball, what type of motion occurs?

Answer 2

Translatory motion because they all go in a linear displacement until acted on by an outside force (Newtons 1st law).

Question 3

Rotary motion is?

Answer 3

Motion around an axis.

Ex. Flexing and extending your elbow.

Question 4

How is rotary motion measured? Linear?

Answer 4

Rotary motion is measured in torque and degrees.

Linear motion is measure in meters or feet.

Question 5

What is velocity?

Answer 5

The rate at which motion occurs. how fast you are moving.
Measured in (translatory m/s and rotary d/s)

Question 6

The rate at which velocity changes is its____?

Answer 6

Acceleration.
Positive acceleration is moving faster.
Negative acceleration is slowing down.
Measured in m/s^2 or d/s^2

Question 7

What is a force?

Answer 7

A push or a pull that causes displacement.

Question 8

What is it called when a motion occurs due to a force applied to the body?

Answer 8

Displacement.

Question 9

Torque cause motion around what?

Answer 9

A rotary axis.

Question 10

What four forces affect body motion?

Answer 10

Gravity, muscles, external resistance, friction.

Question 11

What is force measured in?

Answer 11

Newtons or kg*m/s^2.

Question 12

Moment is?

Answer 12

Force acting at distance from axis.

M= f X d.

Question 13

Newtons first law states what?

Answer 13

Inertia.

An body in motion will stay in motion and an body at rest will remain at rest until acted on by an outside force.

Question 14

Acceleration is which one of Newtons Laws? What does it state?

Answer 14

Newtons Second Law.
Acceleration is proportionate to the magnitude of the net forces acting on it and inversely proportionate to the mass of the body.

Question 15

Newtons third law states what?

Answer 15

For every action, there is an equal and opposite reaction force.
Ex. if we push onto a wall, the wall “pushes back” to resist the force we are exerting to remain stable and not break.

Question 16

What does a vector diagram show?

Answer 16

Force and direction of an object.

Question 17

Where is the axis of rotation located in a first class lever? What is an example of this?

Answer 17

In the middle of the force and resistance arms.

Ex. A seesaw and the adlanto occipital joint.

Question 18

The axis of rotation is at the end of the system and the force arm is larger than the resistance arm in what lever?

Answer 18

The second class lever. 
An example is a wheel barrel and the gastroc. This is better for large amounts of force,  such as our body weight when walking with it having more of a mechanical advantage.

Question 19

Which is the most common lever in the body and what is it designed to do?

Answer 19

The third class lever is designed to produce speed in distal segments. 
The axis of rotation is at the end of the lever and the force is smaller than the resistance arm (the opposite of class two levers)

Question 20

What does this equation show the ratio of? MA = force arm length/ resistance arm length.

Answer 20

Mechanical advantage.

Question 21

Is torque force greater closer to the axis or further away?

Answer 21

Torque produces more force further from the axis due to its mechanical advantage.

Question 22

A point where an object is balanced (typically S2) is called?

Answer 22

Center of mass.

Question 23

In stable equilibrium, can the object return to its previous position?

Answer 23

Yes.

Question 24

What kind of equilibrium seeks a new position after being in an unstable position?

Answer 24

Unstable equilibrium.

Question 25

Describe neutral equilibrium.

Answer 25

In neutral equilibrium, the object can not have a steady COM, but it remains moving in a stable way.
Ex. rolling a bowling ball.

Question 26

Degrees of stability rely on?

Answer 26

The height above the base of support, the size of BOS, gravity, weight of the body.

Question 27

What is the line that draws straight downward from the COM? Is it stable or unstable?

Answer 27

The Base of Support. BOS

And the body is most stable when the COM and BOS follows the line of gravity. Large the BOS, the more stability.

Question 28

Pulleys increase what?

Answer 28

Mechanical advantage because it pulled the tendon/ muscle in a direction with less force acting upon it.

Question 29

______ is defined as force per unit area (p= f/a)

Answer 29

Pressure.

Ex. massage pressure to loosen tight muscles.