Kinematics, Work, Energy, Thermo, Fluids

Question 1

Vector

Answer 1

Magnitude and direction

Question 2

Scalar

Answer 2

Direction only

Question 3

Displacement

Answer 3

Change in objects position, vector

Question 4

Distance

Answer 4

Considers the pathway taken, scalar

Question 5

Average velocity

Answer 5

Displacement / Change in time (Vector)

Question 6

Speed

Answer 6

Distance / Change in time (Scalar)

Question 7

Gravitational force

Answer 7

Fg = (Gm1m2)/r^2 where G = 6.67*10^-11

Magnitude of gravitational force is inversely related to the square of the distance: if r is halved, then Fg will quadruple.

Question 8

Friction

Answer 8

Opposes object movement (gravity, electromagnetic force), two types: static and kinetic.

Question 9

Static friction

Answer 9

0 = fs = usN
occurs between stationary object and a surface, wheels only experiences static friction bc always in contact with ground @ one point

Question 10

Kinetic friction

Answer 10

f = ukN
occurs between moving object and surface
(us > uk) -> Always true

Question 11

Mass (m)

Answer 11

Measure of an objects inertia, the amount of matter in the object, independent of gravity, scalar

Question 12

Weight (Fg)

Answer 12

measure of gravitational force on an object’s mass, vector

Question 13

Relation between mass and weight

Answer 13

Fg = mg where g = 9.8 m/s^2

Question 14

Acceleration

Answer 14

Rate of change of velocity that an object experiences due to some force, on a graph: + slope = acceleration; - slope = deceleration

avg acc = delta(V) / delta(t)

Question 15

Newton’s Laws

Answer 15

1) A body @ rest will stay @ rest unless a net force acts upon it
2) An object of mass m will accelerate when the vector sum of the forces results in some non-zero resultant force vector (Fnet = ma)
3) To every action their is an equal and opposite reaction (Fab = -Fba)

Question 16

Linear motion equations

Answer 16

V = Vo + at
x = Vo*t + (at^2)/2
V^2 = Vo^2 + 2ax
x = vt

Question 17

What is velocity at min/max of free fall?

Answer 17

0

Question 18

Terminal velocity

Answer 18

When drag force = magnitude of weight of an object the object will fall @ a constant velocity, called terminal velocity.

Question 19

Projectile motion

Answer 19

2D -> (Vx, Vy)
Assume Vx is constant
Gravity impacts Vy
Solve using Voy = VoSin(theta); Vox = VoCos(theta)

Question 20

Inclined planes

Answer 20

2D
Fgparr = mgSin(theta)
Fgperp = mgCos(theta)
Look @ notes