Electric Force

Rubbing a balloon on hair is an example of static charge build up created by....

• conduction

• friction

• induction

• hairduction

Tags

NGSS.MS-PS2-3

Consider the electric field lines shown in the diagram below. From the diagram, it is apparent that object A is ____ and object B is ____.

• +,+

• +,-

• -,+

• -,-

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

You have two pairs of charged objects interacting with each other. The first pair (A and B) are 10 cm apart. A has a +1 charge and B has a -1 charge.

Pair C and D are 17cm apart. C has a +1 charge, and D has a -1 charge.

Which of these statements is true?

• There are no electric forces because the charges in each pair of objects cancel.

• The electric force between A and B is smaller than the electric force between C and D.

• The electric force between A and B is greater than the force between C and D.

• The electric force between A and B is identical in magnitude to the electric force between C and D.

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

The ___________ _____________ is the force of attraction or repulsion between objects due to their charges.

• electric charge

• electric force

• distance

• variable

You have 2 circular objects, and each has a positive charge near each other, but not touching. Which statement describes the force that is exerted on the objects due to their electric charge?

• There is a force pushing both objects to the left.

• There is a force pulling the objects toward each other.

• There is a force pushing the objects away from each other.

• There is no force on the objects due to their electric charge.

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

You rub two objects together briefly, and one attracts a few pieces of paper. What happens when the objects are rubbed together for a longer period of time?

• Nothing will happen because nothing has changed.

• The object will attract more pieces of paper because more time has passed.

• The object will attract more pieces of paper because the magnitude of the charge has increased.

• The objects will now repel.

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

When you walk across a carpet in socks, they pick up charges. Later, there aren't any charges in your socks. what probably happened to the charges?

• The charges disappeared.

• The charges switched signs.

• The charges transferred to another object.

• The charges broke apart into smaller particles.

Tags

NGSS.MS-PS2-5

A repelling force occurs between two charged objects when the charges of are of __________.

• like signs

• unlike signs

• equal magnitude

• unequal magnitude

Tags

NGSS.MS-PS2-3

An attracting force occurs between two charged objects when the charges are of _______________.

• like signs

• unlike signs

• equal magnitude

• unequal magnitude

Tags

NGSS.MS-PS2-3

What happens when a rubber rod is rubbed with a piece of fur, giving the rod a negative charge?

• Negative charges are moved from the rod to the fur.

• Negative charges are moved from the fur to the rod.

• Negative charges are added to the rod and the fur remains neutral.

• Positive charges are removed from the rod, and the fur remains neutral.

Tags

NGSS.MS-PS2-5