What is the difference between models I and II?A.I includes negative particles (electrons) while II does notB.I says that the overall charge of an atom is neutral while II does not.C.I says that atoms are not made of smaller parts while II doesD.I says that the positive charge is spread out while II says it is in the nucleus

I. II.

1

• Which of the above are ions?• Which of the above are neutral atoms?• Which of the above are the same element?• Which of the above have the same atomic

mass?• Which of the above have the same charge?

Cl35

17

-1Rn

222

86

+1K

39

19

S 32

16

A B C D

E. 17 protons, 18 neutrons, 17 electronsF. 6 protons, 8 neutrons, 6 electronsG. 8 protons, 8 neutrons, 10 electronsH. 7 protons, 7 neutrons, 10 electrons

-2

2

A neutral balloon is attracted to a mystery object. The mystery object’s charge is:

A.PositiveB.NegativeC.NeutralD.Unknown

3

Super Fun Mystery Object A is

A. Positively ChargedB. Negatively ChargedC. Neutral D. Cannot Be Determined 

Neutral electroscope

Super Fun Mystery Object A ????

4

Object A attracts to positively charged Object B and has no reaction with neutral Object C. What is the charge on Object A?

5

Objects become positively charged by(A)Gaining a proton(B)Losing a proton(C)Gaining an electron(D)Losing an electron

6

The resistance of the LB is 18 ohms. What is the current through points A and B?(A)A is 9 C/s and B is 0 C/s(B)A is 0.5 C/s and B is 0 C/s(C)A and B are both 0.5 C/s(D)A and B are both 9 C/s

A

B

9V

7

Which light bulbs are lit?1

2

3+

-

8

LB1 is 12 ohms and LB2 is 36 ohms. The battery is 18 V.•How many joules does LB 1 take from each coulomb?•What is the current at point A?•What is the current at point D?•What is the current at point G?

B

A

C

D E

GF

1

2

9

LB1 takes 6 J from each coulomb and LB3 takes 8 J from each coulomb.•What is the voltage of the battery?•The current at point d is 2 coulombs per second. How many Joules does LB 2 give off each second?

1

2

3

a

d

f

b

e

c

10

All three circuits have the same battery voltage and all of the light bulbs have the same resistance.Which circuit has the greatest current by the battery?

1

Circuit 1

2

3

Circuit 22

3 Circuit 3

11

The battery is 9 V, the resistance of LB 2 is 6 ohms, and the current through point D is 1 coulomb per second.•What is the resistance of LB 3?•How many joules are carried by the coulombs through point A?

A

B

C

GF

1

2 3

D E

12

• Which of the above position-time graphs show an object with balanced forces?

• Which direction (positive or negative) is the total force in graph H?

P(m)

A

P(m)

D

P(m)

G

P(m)

B

P(m)P(m)

E

P(m)

H

C

F

13

• Which of the above velocity-time graphs shows an object with unbalanced forces?

• What is the direction of the total force in graph D?

V(m/s)

A

V(m/s)V(m/s)

C

V(m/s)

DV(m/s)

E

V(m/s)

F

B

G

14

A sled has the FBD to the right. If the mass of the sled (including anything on it) is 50 kg and the change in velocity is -3 m/s/s, what is the force by the dogs?

F

On sledBy ground

F On sledBy Earth (Gravity)

F

F

On sled

On sled

By friction

(20 N)By dogs

15

After 5 seconds, the velocity of the car is 20 m/s.

What is the change in velocity every second?

If the car has a mass of 15 kg, what is the total force on the car?

V(m/s)

16

An old 8 kg cart is initially at rest when pulled to the left with a force of 12 N in magnitude. Friction pulls on the cart with a force of 4 N in magnitude.

What is the change in velocity for every second?

What happens once the person lets go of the cart?

Sticky track

Old Cart

17