Modterm

Question 0

How do you best represent a vector mathematically?

Answer 0

Magnitude and direction (length gives you the magnitude and the direction shows you the angle)

Question 1

What is materials science?

Answer 1

Study of stress and strain relationships and shear also looks at chemistry and physics

Question 2

You take two vectors and both in the same direction how do you add them together?

Answer 2

You just add them

Question 3

A another way of representing a vector on a graph is using X and Y coordinates what is it called?

Answer 3

Rectangular coordinates

Question 4

If you throw a ball up at an angle whatever degrees what is the vertical coordinate equal to?

Answer 4

Gravity- vertical coordinate

Horizontal velocity - horizontal velocity

Question 5

What is Newton’s first law?

Answer 5

“An object at rest tends to stay at rest and object in motion will tend to stay in motion with the same speed and in the same direction unless acted upon by an unbalanced force.”

Question 6

What is Newton’s 2nd law?

Answer 6

F= MA: acceleration = force/mass; force causes acceleration

Question 7

What is Newtons 3rd law?

Answer 7

“Every action has an equal and opposite reaction”

Question 8

Define inertia?

Answer 8

The resistance an object has to a change in its state in motion

Question 9

True or false inertia is massly proportional to mass?

Answer 9

True

Question 10

If you are in a car and slamming on the brakes applies which newtons law?

Answer 10

Newtons 1st law an object in motion will stay in motion

Question 11

What is the static coefficient of friction?

Answer 11

The force that holds back a stationary object up to the point that it just starts moving

Question 12

What is potential energy?

Answer 12

Stored energy

Question 13

What is kinetic energy?

Answer 13

Mass in motion KE= 1/2mv^2 or the energy of motion

Question 14

What’s the formula for momentum?

Answer 14

P= M*V 
Momentum = mass x velocity ; a force acting upon an object to cause a displacement

Question 15

Is work a unit of power?

Answer 15

The amount of work you do per unit time is called power; displacement
Power = work/time
Power = force *velocity

Question 16

Define torque?

Answer 16

Force times distance turning something into a circle rotational motion; it is a measure of how much a force acting on an object causes that object to rotate

Question 17

Where does the center of gravity falls for a women or men?

Answer 17

For women is through the hips
For men 2” higher
W

Question 18

Decriibe a first class lever?

Answer 18

The fulcrum is between the load and effort

Examples (scissors, pliers, seesaw)

Question 19

Describe a 2nd class lever?

Answer 19

Fulcrum and effort at opposite ends and the load is somewhere between the two (wheelbarrow)

Question 20

Describe a 3rd class lever?

Answer 20

The fulcrum is at the end whereas the effort is in the middle
Examples: biceps

Question 21

The head is what order lever?

Answer 21

First order lever

Question 22

Standing on the toes is what type of lever?

Answer 22

2nd class lever

Question 23

What is limits of stability?

Answer 23

Balance platform if center of gravity fall from center of hip to the silhouette of the foot
It is stable if it falls on the outside
The base is unstable

Question 24

Compression fx is most common in persons with wheelchair at the ?

Answer 24

Head of the femur

Question 25

Define plasticity?

Answer 25

Bends and stays bend but doesn’t break

Question 26

Define elasticity?

Answer 26

An object bends but return to its original shape

Question 27

If you are on a table in you jump down what keeps you from tearing the muscles in your lower leg?

Answer 27

Tendons they Are elastic like a rubber band or a spring

Question 28

What causes a spiral fracture?

Answer 28

Twisting and rotation

Question 29

What elastic material is under a tendon that protects the tendon?

Answer 29

Hyaline cartilage from touching the bone during motion

Question 30

Are disc elastic?

Answer 30

Yes

Question 31

When building an orthotic device across the knee where should the orthotic device be in relation to the knee?

Answer 31

Right over the center of rotation at the knee

Question 32

Where is the fracture point?

Answer 32

At the end of the plastic region

Question 33

Is bone very pLastic?

Answer 33

No it’s elastic

Question 34

Is a muscle a linear or non linear force generator?

Answer 34

Non linear

Question 35

Which develop more coarse the long arrangement of fibers or the pinnate arrangements?

Answer 35

Pinnate muscles are stronger