Mechanical Principles Test 1

Question 0

Weight

Answer 0

Earths gravitational pull.

Relative to the center of the earth

Force

Question 1

Mass

Answer 1

Contains substance or matter

Question 2

What is the correlation between mass and weight?

Answer 2

They are perfectly correlated. As one doubles, so does the other

Question 3

Newtons first law of motion

Answer 3

Law of inertia.

A body at rest will stay at rest or continue at a constant velocity and in a straight line unless acted upon by an external unbalanced force

Question 4

Inertia

Answer 4

Resistance to change

Question 5

What is the correlation between inertia and mass?

Answer 5

It is directly related to mass. more mass= more resistance to change

Question 6

Equation for speed

And def.

Answer 6

D/t

Distance/time

How fast an object is traveling

Question 7

Scalar quantity measures what?

Answer 7

Only measures magnitude

Question 8

Acceleration/deceleration def. and equation

Answer 8

A=F/M
OR
A= change of velocity/ change of time

Rate that speed changes

Question 9

Velocity equation

Answer 9

V=s/t

Question 10

Vector quantity

Answer 10

Measures magnitude and direction

Velocity

Question 11

Force equation

Answer 11

Force= mass X acceleration

Question 12

Newtons second law of motion

Answer 12

Law of acceleration.

Acceleration of an object is directly proportional to the force acting on it, is in the same direction of the force acting on it, and is inversely related to the mass of the object

Question 13

Center of gravity

Answer 13

The point at which weight is evenly distributed over a center point.
Point at which mass and weight are balance in every direction.
Point where gravitational forces are centralized

Question 14

Newtons third law of motion

Answer 14

Reaction force.

For every action there is an equal and opposite reaction

Question 15

Equation for impulse and definition

Answer 15

Impulse= force X time
OR
Impulse= mv final - mv initial

Force applied to an object over time
Change in momentum

Question 16

Force definition

Answer 16

A push or pull that changes the state or motion of an athlete or object.

External and internal forces

Question 17

External forces

Answer 17

Gravity, ground reactive forces, friction, areas distance, contact forces from opposing athletes

Question 18

Internal forces

Answer 18

Muscles

Question 19

Projectile definition

Answer 19

Something or someone traveling through the area that will eventually hit the ground.
Trajectory- horizontal + vertical direction

Question 20

What three factors influence the projectile

Answer 20

Angle of release
speed of release
Height of release

Question 21

Angle of release:

What Does it determine? And the three types of releases

Answer 21

Determines shape of flight path. Straight vertical, above 45° – height>distance
Below 45- distance > height
45- distance=height
Straight vertical

Question 22

Speed of release

what does it determine, and how does it work

Answer 22

Determine size of flight path

Increasing speed increases apex and distance

Question 23

What is an Apex?

Answer 23

Highest point of flight path

Question 24

A
O
I
Sternocleidomastoid muscle

Answer 24

A: neck flexion
O: manubrium and clavicle
I: mastoid process

Question 25

Rectus Abdominis muscle

AOI

Answer 25

A: back flexion, posterior pelvic flexion
O: pubic crest, pubic symphysis
I: costal cartilage of ribs 5-7, xiphoid process

Question 26

External oblique abdominal muscle

AOI

Answer 26

A: back flexion, posterior pelvic rotation
O: lower borders of ribs 5-12
I: anterior half of the iliac crest, pubic symphysis, superior margin of pubis

Question 27

Internal oblique abdominal muscle

AOI

Answer 27

A: lumbar flexion, posterior pelvic rotation
O: Inguinal ligament, iliac crest, thoracolumbar fascia
I: costal cartilage of ribs 8-10, ribs 10-12, linea alba

Question 28

Transverse Abdominis muscle

AOI

Answer 28

A: compression of abdominal cavity
O: inner surface of ribs 7-12, inner surface of iliac crest, Inguinal ligament
I: linea alba, pubis aponeurosis of internal oblique

Question 29

Equation for momentum

Answer 29

Momentum= mass X velocity

Question 30

Mechanical work equation

Answer 30

Work= force X distance

Question 31

Power equation

Answer 31

Power= force X distance/ time
OR
Power= work/ time

Question 32

Strength definition

Answer 32

Amount of force produced in a single effort

Question 33

Kinetic energy definition and equation

Answer 33

KE= 1/2mv^2

Energy in action

Question 34

Potential energy equation and definition

Answer 34

PE= mgh

Stored energy ready for use. When it’s put into use, it’s kinetic

Question 35

Correlation between height and kinetic energy

Answer 35

As height increasing so does kinetic energy

Question 36

Strain energy

Answer 36

Stored energy in obstacles that are strained but can be restored to their original shape

Rubber band

Question 37

Static friction def. and equation

Answer 37

Between the surface of two objects in contact with each other.
Is the resistive force for the initiation of movement

F=mn

Question 38

Sliding friction

Answer 38

A type of kinetic friction.

Resistive force between the surfaces to you sliding object

Question 39

Rolling friction

Answer 39

Type of kinetic friction. Resistive force of the surface of one object rolling over the surface of another object.

Question 40

What is rolling friction affected by

Answer 40

Fiction between the two surfaces in contacts. Pressure or weight between the two surfaces
Diameter of the rolling object

Question 41

What is the order of the frictions

Answer 41

Static> sliding> rolling