Physics Final

Question 1

Period

Answer 1

time to make one revolution (not quarter)

Question 2

Calculate the speed of an object in UCM.

Answer 2

circumference/ period

Question 3

Speed vs. velocity for UCM

Answer 3

Speed: constant
Velocity: magnitude is the same but the direction changes

Question 4

reason for centripetal acceleration.

Answer 4

Centripetal acceleration: due to centripetal force (frictional gravitational, normal, or tension force); always towards the center

Question 5

centripetal force.

Answer 5

Direction is always toward the center

Question 6

Unbanked curve

Answer 6

Flat curve; static friction matters; represents the max speed a car can negotiate without slipping
slippy= kinetic

Question 7

Banked Curve

Answer 7

Frictionless; force due to fNsinO

Question 8

Satellite in Orbit

Answer 8

In order to stay in orbit, must operate at fixed speed
Centripetal force due to gravitational force

Question 9

Work

Answer 9

the amount of energy to get an object from one position to another using a constant force
Scalar; Joules

Question 10

KE

Answer 10

All objects that move; Joules and never negative; scalar
Total kinetic energy
+= moving faster
-= deacclerating
0= velocity is constant

Question 11

gravitation PE

Answer 11

The energy an object has to its relative position

Question 12

NC forces

Answer 12

Non-conservative forces: applied, normal, kinetic friction, tension and air resistance
When there is no conservative force Ef=E0

Question 13

Impulse

Answer 13

how long an average force is exerted on an object N*s
Same direction as force; vector
Change in momentum

Question 14

Momentum

Answer 14

how large of a response an object has to an impulse kg*m/s
Same direction as velocity; vector quantity

Question 15

conservation of momentum

Answer 15

when momentum final = momentum initial

Question 16

Elastic collisions

Answer 16

Total initial kinetic energy= total final kinetic energy
P0=Pf
Elastic collision
1D collision
V2=0

Question 17

Inelastic collision:

Answer 17

: initial kinetic energy does not equal total final kinetic energy

Question 18

Completely inelastic collisions:

Answer 18

inelastic & 2 objects stick together
Can only use conservation of momentum if the momentum is 0

Question 19

Define center of maass

Answer 19

When you have 2 masses, the center of mass is the average location for the total mass from some point of reference
If total momentum is conserved, them vcm0=vcmf

Question 20

Conductors

Answer 20

difficult for electrons to pass through
Wood, plastic and rubber

Question 21

Insulators

Answer 21

electrons can easily move
Copper, Gold, Aluminum, Mercury, Silver

Question 22

Conservation of charge

Answer 22

When the net charge of an isolated system remains constant

Question 23

Charging by contact

Answer 23

When a negatively/ positively charged rod touches and uncharged metal sphere; rod is pulled away so charge stays in sphere
Discharge by connecting wire to laptop to ground (discharges when touches ground)

Question 24

.By induction

Answer 24

When a negatively/positively charged rod touches a charged sphere; the similar charges in the sphere are repelled and the opposite are attracted
Wire is attached and the opposite charges are pushed out and escape

Question 25

How do electric forces act on a particle?

Answer 25

Repulsive force: like charges
Attractive force: dissimilar forces

Question 26

Electric Field:

Answer 26

measure intensity of the electric force at a location; electrostatic force experienced by a small test charge
1.Always point from + to -
2.Field lines originate from + and to -
3.Closer lines= stronger
4. # of lines leaving += mg of charge

Question 27

Capacitators

Answer 27

electrical devices that store electrostatic energy.

Question 28

Power

Answer 28

the rate at which work is done
Watt (Joule/Second)