Test 1

Question 1

What is Biomechanics

Answer 1

The study of forces and their effects on living organisms

Question 2

What is Mechanics

Answer 2

The study of force and motion

Question 3

What is Force

Answer 3

A push or a pull that has the ability to accelerate an object. vector quantity, that is usually measured in Newtons

Question 4

What is Mass

Answer 4

The amount of matter an object is made of. Scalar quantity

Question 5

What 5 steps do you use to describe motion

Answer 5

1. Name the Action
2. Name the plane it occurs in
3. Name the segment that moves
4. Name the joint at which it moves
5. Give the angles of movement

Question 6

What are the degrees of the joints in anatomical position

Answer 6

all joints are 0 degrees except the ankle is at 90 degrees

Question 7

How does flexion/extension affects the angles of your body in anatmical position

Answer 7

flexion increases joint angle, extension decreases

Question 8

What is internal force and an example

Answer 8

a force within a body that doesn’t (alone) accelerate the whole body mass.
Movement about a joint, or heart muscle

Question 9

What is an external force and an example

Answer 9

outside Force put on an object that has the ability to accelerate the whole body mass (golfball being hit by a driver)

Question 10

What is non-contact force

Answer 10

force without contact (GRAVITY)

Question 11

What is a contact force

Answer 11

force from two or more objects coming in contact with each other

Question 12

What are the 2 kinds of contact force

Answer 12

Normal force and Friction force

Question 13

What is normal force

Answer 13

Force that is applied perpendicular to the contact surfaces

Question 14

What is friction force

Answer 14

Force that is parallel to the contact surfaces

Question 15

What are the two kinds of friction force

Answer 15

Static friction and dynamic friction

Question 16

What is static friction

Answer 16

the friction force when there is no movement between the contact surfaces

Question 17

What is dynamic fricition

Answer 17

the friction force when the two contact surfaces are moving past each other.

Question 18

What is the relationship between dynamic and static friciton

Answer 18

Static friction is greater than dynamic friction

Question 19

What is the scale for the coefficient of friction

Answer 19

0-1, 0 being very slippery, 1 being completely sticky

Question 20

What is static friction

Answer 20

It’s when the sum of all of the forces on the object = 0. Meaning there is no acceleration

Question 21

What is kinematics

Answer 21

The study of motion without regards to force

Question 22

What is linear motion

Answer 22

Motion in a straight line

Question 23

What are the two kinds of linear motion

Answer 23

Rectalinear and curvalinear

Question 24

What is rectalinear motion and an example

Answer 24

All points move IN STRAIGHT LINES, the same direction and distance in the same amount of time.
(moving walkway)

Question 25

What is curvalinear motion and an example

Answer 25

all points the same direction and distance in the same amount of time, but they do NOT move in straight lines (jumping on a tramp, landing in the same position but on a different part of the tramp)

Question 26

What is angular motion (example)

Answer 26

Rotation, movement that often involves a fixed axis (feet stay still but you tip over)

Question 27

What is general motion (example)

Answer 27

a combination of linear and angular motion (walking, body moves linearly, but segments move with angular motion)

Question 28

What are the 4 kinematic variables

Answer 28

1. Position 2. Displacement 3. Velocity 4. Acceleration

Question 29

What is position

Answer 29

Your location relative to a certain point

Question 30

What is displacement

Answer 30

(P2-P1) where you are relative to where you once were. (Change in position)

Question 31

What is velocity

Answer 31

displacement divided by time.

Question 32

What is acceleration

Answer 32

change in velocity divided by time.

Question 33

What is speed

Answer 33

distance divided by time

Question 34

what is distance

Answer 34

how far you have traveled

Question 35

What is the temporal midpoint

Answer 35

1/2 way point in time

Question 36

When do you use the temporal midpoint

Answer 36

When you are trying to find average speed during that time (More measurements = more accuracy)

Question 37

What is average speed

Answer 37

total distance/ total time

Question 38

What is instantaneous speed

Answer 38

how fast you are traveling at a certain moment in time

Question 39

How do we find the instantaneous speed

Answer 39

use the temporal midpoint to find the average speed of a very short period of time.

Question 40

Is the acceleration of a projectile constant 1. horizontal 2. vertical

Answer 40

Yes to both 1. 0 2. -9.81 m/s/s

Question 41

is the velocity of a projectile constant 1. for the x axis 2. for the y axis

Answer 41

1. Yes | 2. No

Question 42

What is the vertical velocity of a projectile at max height

Answer 42

0 m/s

Question 43

what are the variables that affect dx

Answer 43

1. angle 2. horizontal velocity 3. time it is in the air 4. height of release

Question 44

how does the angle affect dx

Answer 44

The higher the angle, the less horizontal velocity, but the greater the time in the air.

Question 45

How does horizontal velocity affect dx

Answer 45

the faster it moves the more ground it can cover

Question 46

How does time in the air affect dx

Answer 46

the longer it is in the air the more time is has to move horizontally

Question 47

how does height of release affect dx

Answer 47

the higher you release it from the more time that it has in the air, but also the higher you move, the more you can lower the angle, and thereby increase horizontal velocity, without sacrificing too much time in the air

Question 48

What is kinetics

Answer 48

the study of motion with regard to force

Question 49

What is newtons 1st law

Answer 49

a body will have remain in motion unless acted upon by an outside force. (no acceleration)

Question 50

What is inertia

Answer 50

an objects resistance to acceleration (quantified by mass)

Question 51

What is momentum

Answer 51

Mass x Velocity

Question 52

what does the u stand for in the momentum equations

Answer 52

velocity before impact

Question 53

Why does post impact velocity matter

Answer 53

will in sports like baseball the speed of the ball after will be beneficial

Question 54

what is an elastic collision

Answer 54

when momentum is mostly conserved (superballs)

Question 55

What is an elastic collision

Answer 55

when momentum is mostly lost (playdough)

Question 56

What is the coefficient of restitution

Answer 56

comparison of post impact velocities to pre impact velocites

Question 57

what is the coefficient of restitution for elastic collisions , then inelastic collision

Answer 57

close to 1 for elastic, close to 0 for inelastic

Question 58

What is Newtons 2nd law

Answer 58

(Law of acceleration) an outside force will cause a body to accelerate in the direction of the force, proportional to the magnitude of the force, inversly proportional to the mass of the body

Question 59

What is impulse

Answer 59

force applied throughout a duration of time

Question 60

how do you find impulse

Answer 60

1. Average force X time | 2. integral (space under curve) of the force x time graph

Question 61

What does an impulse cause

Answer 61

Change in momentum (change in velocity)

Question 62

What is newtons 3rd law

Answer 62

When a body puts a force on another body, that second body puts a reactionary force back on the first body that is equal in magnitude and opposite in direction.

Question 63

What is Newtons law of gravitation

Answer 63

all bodies are attracted to one another proportional to the product of their masses over the square of the distance between them.