Friction, Induction, Conduction

Without friction, an object in motion would never stop.

• true

• false

What type of energy transfer occurs when a student warms her hands by putting them around a hot mug of tea?

• Conduction because energy is transferred by direct contact

• Convection because energy is transferred by direct contact

The handle of a metal spoon warms up when it is placed in a hot bowl of soup because of ________.

• Convection

• Conduction

• Induction

• Radiation

In an electrically neutral object, what must be true about the numbers of protons and electrons?

• There are more protons than electrons

• There are more electrons than protons

• They are equal

Tags

NGSS.MS-PS1-1

Electromagnetic induction occurs in a wire when a change occurs in ______ in wire. 

Tags

NGSS.HS-PS2-5

Friction produces ____.

Tags

NGSS.MS-PS3-5

_____ are good conductors

Conduction is the transfer of thermal energy ___________.

• in the form of electromagnetic waves such as infrared radiation without the aid of a medium
• through a medium without any flow of the medium
• by means of convection currents in a fluid (liquid or gas), due to a difference in density
• None of the above

Tags

NGSS.MS-PS3-3

A generator is used to light a bulb.  Energy for lighting the bulb actually comes from a

• coil or wire
• mechanical intput to the generator
• magnet in the generator
• plug where the generator is connected to the wall

Tags

NGSS.MS-PS3-5

When there is a change in the magnetic field in a closed loop of wire

• (a) a voltage is induced in the wire
• (b) current is made to flow in the loop of wire 
• (c) electromagnetic induction occurs
• (d) all of these

Tags

NGSS.HS-PS2-5