Concept 1 Charge

In a neutral atom, the number of electrons is equal to the number of _______.

• Neutrons
• Orbits
• Protons
• subatomic particles

If two charges repel each other, the two charges must be

• Positive and neutra
• Positive and negative
• positive and neutral
• negative and negative

Tags

NGSS.MS-PS2-3

An object becomes charged when the atoms in the object gain or lose

• electrons
• protons
• neutrons
• all of the above

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

If you rub a glass rod with a piece of silk, the rod becomes positively charged. This means that

• friction destroyed electrons in the rod.
• the silk has become negatively charged.
• protons have moved to the rod.
• glass attracts more protons.

Tags

NGSS.HS-PS1-1

If you bring a charged object near an electrically neutral surface without allowing the object to touch the surface, the charges in the surface are rearranged by

• friction.
• convection.
• induction.
• conduction.

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

Objects that have opposite charges

• are attracted to each other, and the force between the objects pulls them together.
• are attracted to each other, and the force between the objects pushes them apart.
• are repelled by each other, and the force between the objects pulls them together.
• are repelled by each other, and the force between the objects pushes them apart.  

Tags

NGSS.MS-PS2-5

A region around a charged particle that can exert a force on another charged particle is called an

• electric pulse.
• electric charge.
• electric force.
• electric field.

Tags

NGSS.MS-PS2-5

Charging by ____ occurs when electrons are transferred from one object to another by direct contact.

• reduction
• induction
• conduction
• friction

When you pull a cotton sweater off your skin, electrons are transferred from the ___________________ (cotton, skin) to the __________________ (cotton, skin). As a result, your body acquires a ___________ (+ , -) charge and the cotton sweater acquires a ___________ (+ , -) charge.

• skin, cotton, +, -
• cotton, skin, +, -
• skin , cotton, -, +
• cotton, skin, -, +

Tags

NGSS.MS-PS2-3

Electric field lines are drawn

• In a radial direction, from negative to positive.
• In a radial direction, from positive to negative.