Midterm 2

Question 1

What is a projectile?

Answer 1

any object, not in contact with the ground that is allowed to move under the influence of gravity and no other external force.

Question 2

What kind of path will an object in flight on earth follow?

Answer 2

Parabolic

symmetrical curve

Question 3

When an object is not in contact with the ground what is its horizontal acceleration?

Answer 3

0 m/s^2

Question 4

What is the optimal angle of release for height?

Answer 4

90 degrees

Question 5

What is the optimal angle of release for distance?

Answer 5

45 degrees

Question 6

What does the jump mat measure?

Answer 6

It measures time in the air and jump height

Question 7

What does the force plate measure?

Answer 7

Measures the time in the air and calculates initial velocity

Question 8

What does the Ipod measure?

Answer 8

Jump time, measures the period of time when the accelerometer doesn’t measure any force

Question 9

What are Kinetics?

Answer 9

The concepts of mass, force, and energy as they affect motion.

Question 10

What is Newton’s first law?

Answer 10

Law of inertia: an object at rest tends to stay at rest and an object in uniform motion tends to stay in uniform motion unless acted upon by a net external force

Question 11

Explain the difference between static and dynamic equilibrium.

Answer 11

Static equilibrium is an object at rest with a net external force of 0 acting on it.

Dynamic equilibrium is an object in uniform motion with a net external force of 0 acting on it.

Question 12

What is inertia?

Answer 12

an objects tendency to resist change in the state of motion

Question 13

what is the equation for momentum?

Answer 13

P = mass x velocity

Question 14

What is the law of conservation of momentum?

Answer 14

In the absence of external forces, the total momentum of a given system is conserved (is constant)

Pbefore = Pafter

Question 15

What is the coefficient of restitution and what is it used for?

Answer 15

it is the absolute value of the ratio of the velocity of separation to the velocity of approach.

It is a means of quantifying how elastic the collisions are.

e = (Vbf - Vaf)/(Vai - Vbi)

Question 16

What is the COR for a perfectly elastic collision?

Answer 16

1

Question 17

What is the COR for a perfectly inelastic collision?

Answer 17

0

Question 18

Provide the equation for elastic collisions.

Answer 18

MaVai + MbVbi = MaVaf + MbVbf

Question 19

Provide the equation for inelastic collisions.

Answer 19

M1V1 + M2V2 = (M1+M2)Vcombined

Question 20

What makes up the Combined Free Limb Relative Momentum?

Answer 20

CFLRM = Contralateral Arm RM + Ispsilateral Arm RM + Lead Leg RM

Question 21

What is Newton’s Second law?

Answer 21

The law of acceleration

A force applied to a body causes an acceleration of that body of a magnitude proportional to the force, in the direction of the force, and inversely proportional to the body’s mass

Question 22

What is Newton’s Third Law?

Answer 22

The Law of Reaction

Every applied force is accompanied by a reaction force, equal in magnitude and opposite in direction

Question 23

What is impulse? Give the equation for it.

Answer 23

Impulse is a measure of a force applied for a certain amount of time.

I = Force x Time

I = change in momentum

Question 24

What are two things that the change in the momentum of a system depends on?

Answer 24

1) The magnitude of external forces

2) The time over which the forces act

Question 25

What is Friction?

Answer 25

The force resisting the relative motion of solid surfaces. Dry friction Fluid Internal

Question 26

What is the equation for the critical point of static friction?

Answer 26

F = mew x N

Question 27

What are some characteristics of kinetic friction?

Answer 27

As Force applied increases,It remains constant and is always less than Force applied

Question 28

For any incline of a certain angle, what are the equations you can use to find perpendicular, parallel, Normal, Friction

Answer 28

Fpd = mg x (Cos(angle)) Fpl = mg x (Sin(angle)) N = -mg x (Cos(angle)) Ff = -mg x (Sin(angle))

Question 29

What is angular kinematics?

Answer 29

The study of motion of an object about a circular path exclusive of the influences of mass and force.

Question 30

When does angular motion occur?

Answer 30

Angular motion occurs when all points on an object move in a circular path around the same axis

Question 31

Describe absolute angular displacement

Answer 31

angular position of an object relative to a fixed position

Question 32

Describe Relative angular velocity

Answer 32

angular position of an object relative to a plane or line that is capable of moving

Question 33

In angular kinematics, what direction is considered negative and which is considered positive?

Answer 33

``` Clockwise = negative Counterclocwise = positive ```

Question 34

Describe Centripetal Acceleration

Answer 34

if something is turning around a circle then it required an external force or acceleration to cause it to change direction Centre seeking

Question 35

What are the four main components of a signal?

Answer 35

Frequency, Amplitude, Off-set, Phase shift

Question 36

What is it called when you convert a time-domain signal to a frequency-domain signal?

Answer 36

Fourier Transform