Free Printable 1/25 Homework (due 1/27 at 8 AM)

1.

Which equation is used for gravitational force?

a)

b)

c)

d)

2.

Which equation is used for electrostatic force?

a)

b)

c)

d)

3.

What is the value of k?

a)

$9\ x\ 10^9$

b)

$6.67\ x\ 10^{-11}$

c)

$9.8$

d)

$4.12\ x\ 10^{13}$

4.

What is the value of G?

a)

$9\ x\ 10^9$

b)

$6.67\ x\ 10^{-11}$

c)

$9.8$

d)

$4.12\ x\ 10^{13}$

5.

What is the correct order of steps for solving the gravitational force $F_g$ equation?

a)

$1.\ G\ x\ m_1\ x\ m_2$ $2.\ \div r^2$

b)

$1.\ m_1\ x\ m_2$ $2.\ \div r^2$ $3.\ \div r^2$

c)

$1.\ m_1\ \div\ r^2$ $2.\ \times\ G$

d)

$1.\ m_1\ x\ m_2$ $2.\ \div r^2$ $3.\ x\ G$

6.

There is a gravitational force of a pencil eraser on our school building. What is true about the gravitational force of our school building on the pencil eraser?

a)

It is more than the gravitational force of the pencil eraser on our school building

b)

It is equal to the gravitational force of the pencil eraser on our school building

c)

It is less than the gravitational force of the pencil eraser on our school building N

d)

We don't have enough information to know.

7.

Both Object 1 and Object 2 ALWAYS exert _________ forces on one another.

a)

equal

b)

different

c)

similar

d)

negative

8.

When you double mass or charge the force ______, and when you double distance the force ______.

a)

stays the same, doubles

b)

decreases, increases

c)

doubles, $\div4$

d)

$\div4$ , doubles

9.

Any of the three forces we learned have a ________ relationship with distance, meaning when you increase distance, you _____ force.

a)

directly proportional, decrease

b)

directly proportional, increase

c)

indirectly proportional, increase

d)

indirectly proportional, decrease

10.

Which of the following forces did we NOT learn about?

a)

Electrostatic force

b)

Magnetic Force

c)

Normal Force

d)

Gravitational Force

11.

Gravitational force has a ________ relationship with mass, meaning when you increase mass, you _____ force.

a)

directly proportional, decrease

b)

directly proportional, increase

c)

indirectly proportional, increase

d)

indirectly proportional, decrease

12.

Electrostatic force has a ________ relationship with the magnitude of charge, meaning when you increase magnitude of charge, you _____ force.

a)

directly proportional, decrease

b)

directly proportional, increase

c)

indirectly proportional, increase

d)

indirectly proportional, decrease

13.

Suppose that two point charges, each with a charge of +8.00 Coulomb, are separated by a distance of 10.00 km. Show the equation that you would use to calculate the magnitude of the electrical force of repulsion between them.

a)

$F_e=9x10^9\ \left(\frac{8x8}{1^{ }}\right)$

b)

$F_e=6.67x10^{-11}\ \left(\frac{8x8}{10^2}\right)$

c)

$F_e=9x10^9\ \left(\frac{8x8}{1^{ }}\right)$

d)

$F_e=9x10^9\ \left(\frac{8x8}{10^2}\right)$

14.

Two charges are attracted to each other by a force of 100 N.

What would be the force of attraction if the charge of each was doubled and the distance between them kept constant?

a)

25 N

b)

100 N

c)

200 N

d)

400 N

15.

Two charges are attracted to each other by a force of 100 N. What would be the force if one charge was doubled, the other charge tripled, and the distance between them kept the same?

a)

100 N

b)

500 N

c)

600 N

d)

1000 N

16.

Which force can be both attractive AND repulsive?

a)

Electrostatic force

b)

Electric force

c)

Gravity

d)

Gravitational force

17.

Which force is ONLY attractive?

a)

Electrostatic force

b)

Electric force

c)

Gravity

d)

Gravitational force

18.

Which force is always the strongest?

a)

Electric force

b)

Gravitational force,

c)

Electrostatic force

d)

Gravity

19.

_____ is the symbol used for charge, and _____ is the unit used for charge.

a)

$q_1,q_2$

b)

q,C

c)

C,q

d)

N,C

20.

_____ is the symbol used for mass, and _____ is the unit used for mass.

a)

$N,g$

b)

q,C

c)

m,kg

d)

kg,m

21.

What is the unit for force?

a)

C (Coulomb)

b)

N (Newton)

c)

q (charge)

d)

m (mass)

22.

Which picture shows the correct way to measure the distance between two objects? Assume the black line is the ruler.

a)

b)

c)

d)

23.

Two point charges are 4 km apart. One is +5 C and the other is +9 C. This force is ___________.

a)

we don't have enough information

b)

repulsive

c)

attractive

d)

both repulsive and attractive

24.

Two point charges are 4 km apart. One is -5 C and the other is +9 C. This force is ___________.

a)

we don't have enough information

b)

repulsive

c)

attractive

d)

both repulsive and attractive

25.

Two objects 7 km apart have gravitational force. One is 4 kg and the other is 32 kg. This force is ___________.

a)

we don't have enough information

b)

repulsive

c)

attractive

d)

both repulsive and attractive

26.

ANY two objects with mass have _______________.

a)

gravitational force

b)

electrostatic force

c)

magnetic force

d)

electromagnetic force

27.

ANY two charges or charged objects have _______________.

a)

gravitational force

b)

electrostatic force

c)

magnetic force

d)

electromagnetic force

28.

$F_g$ is bigger than G when $\left(\frac{m_1\ x\ m_2}{r^2}\right)$ is ___________, smaller than G when $\left(\frac{m_1\ x\ m_2}{r^2}\right)$ is ________ and equal to G when $\left(\frac{m_1\ x\ m_2}{r^2}\right)$ = _____.

a)

less than 1, greater than 1, 1

b)

greater than 1, less than 1, 1

c)

1, less than 1, greater than 1

d)

greater than 1, 1, less than 1

29.

Draw the graph of gravitational force and mass.

30.

Draw the graph of ANY force (gravitational, electrostatic OR magnetic) and distance (r).

1/25 Homework (due 1/27 at 8 AM)

Total questions: 30

Worksheet time: 16mins

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