Biomechanics

Question 1

_____ causes change in things.

Answer 1

Force

Question 2

Force causes what two types of change in things?

Answer 2

Deformation and motion

Question 3

What are three types of force-induced changes?

Answer 3

Tension, compression, acceleration

Question 4

Tension causes an object to ______.

Answer 4

Elongate

Question 5

Compression causes an object to _____.

Answer 5

Shorten

Question 6

Acceleration causes an object to _____.

Answer 6

Move

Question 7

________ is a term referring to the “quantity of motion”.

Answer 7

Momentum

Question 8

Momentum is the sum of what?

Answer 8

Mass x Velocity

Question 9

Force can do what to momentum?

Answer 9

Change it

Question 10

Newton’s First Law states what?

Answer 10

Objects in motion or at rest remain in that state unless worked upon by an external force.

Question 11

Newton’s Second Law states what?

Answer 11

The change caused to motion is proportional to the amount of force applied.

Question 12

Newton’s Third Law states what?

Answer 12

Every action has an equal and opposite reaction.

Question 13

The Greek character Sigma (Σ) means what?

Answer 13

‘In summation’ or ‘the sum of’

Question 14

Which of Newton’s Laws can be stated as ΣF=ma?

Answer 14

Newton’s Second law (the sum of Force is equal to mass times acceleration)

Question 15

Which of Newton’s Laws can be stated as ΣF=0?

Answer 15

Newton’s First Law (the sum of Force is equal to 0).

Question 16

All mass is attracted to all other mass. What is this force of attraction called?

Answer 16

Gravity

Question 17

The force of gravity on Earth’s surface is ___m/s².

Answer 17

9.8

Question 18

Gravity always points _____ _____.

Answer 18

Straight down

Question 19

What is the metric unit of force?

Answer 19

The Newton

Question 20

A kilogram is a unit of ____.

Answer 20

Mass

Question 21

A pound is a unit of ____.

Answer 21

Force

Question 22

The force times the distance that the object moves in the direction force was applied is called ____.

Answer 22

Work

Question 23

Newton-meters, joules, foot-pounds and calories are all units used to represent an amount of ____.

Answer 23

Work

Question 24

Work is _____.

Answer 24

Energy

Question 25

What are two types of energy?

Answer 25

Kinetic and potential

Question 26

Energy that is stored and could be released is called _____ energy.

Answer 26

Potential

Question 27

When an object is in motion, it is said to have ______ energy.

Answer 27

Kinetic

Question 28

What are two types of potential energy?

Answer 28

Elastic and gravitational potential energy

Question 29

A loaded barbell suspended above the ground represents what type of energy?

Answer 29

Gravitational potential energy

Question 30

The so-called "stretch reflex" is an example of ______ potential energy.

Answer 30

Elastic

Question 31

The equation ½mv² (half mass times velocity squared) represents _____ energy.

Answer 31

Kinetic

Question 32

Potential energy is represented by the equation _____.

Answer 32

mgh (mass x gravity x height)

Question 33

The rate of work (force times distance) is called _____.

Answer 33

Power

Question 34

Power = ____ / _____.

Answer 34

Energy / Time

Question 35

The equation for work is ________.

Answer 35

W = F*d (Work = Force x distance)

Question 36

Power is ____ divided by time.

Answer 36

Work or force x distance

Question 37

Force, velocity and acceleration are all examples of _____.

Answer 37

Vectors

Question 38

A vector is force with ______.

Answer 38

Direction

Question 39

Something like mass or power has no direction and is called a ______.

Answer 39

Scalar

Question 40

A vector has ______ and direction.

Answer 40

Magnitude

Question 41

Examples of vectors are:

Answer 41

Velocity, Force, Acceleration, and Momentum

Question 42

Vectors can be calculated in two ways. By graphing or _______.

Answer 42

Trigonometrically

Question 43

In barbell training the force vector is _______.

Answer 43

Vertical

Question 44

Forces acting around a point of rotation are called _____.

Answer 44

Moment

Question 45

What type of motion is it when force is proportional to straight-line momentum?

Answer 45

Straight-line motion

Question 46

Force and momentum are proportional to the change in rotational momentum in ______ motion.

Answer 46

Rotational

Question 47

F=ma is the equation for ____________ motion.

Answer 47

Straight-line