chapter 5

Grade-9

Dec 2, 2020

lets start

match the vocabulary words Mcgraw hill site

OBJECTIVES

• Differentiate thermal energy, temp and heat

• describe the ways of thermal energy transfer

• solve for temp conversions

which of the following has more heat ?

Multiple Choice

How is mechanical energy different from thermal energy?

• mechanical energy includes kinetic and potential energy, and thermal energy includes only kinetic energy

• mechanical energy is a property of whole objects, and thermal energy is a property of the particles that make up an object

• mechanical energy includes kinetic energy only, and thermal energy includes kinetic and potential energy

• mechanical energy applies only to objects that are moving, and thermal energy applies only to objects at rest

Multiple Choice

Which is the energy stored in the interaction between objects or particles?

• kinetic energy

• potential energy

• mechanical energy

• thermal energy

Multiple Choice

Which statement is true of the image shown here?

• the molecules in beaker A are moving faster than the molecules in beaker B

• the molecules in beaker A are moving at the same speed as the molecules in beaker B

• the molecules in beaker B are moving faster than the molecules in beaker A

• beaker A contains more molecules that are moving than beaker B does

Multiple Choice

Which is the definition of heat?

• the total kinetic energy of the particles in an object

• the movement of thermal energy from a warmer object to a cooler object

• the expansion of an object due to increased thermal energy

• the difference in temperature between two objects

Multiple Choice

As the temperature of a substance rises, the average kinetic energy of the particles making up the substance

• increases

• decreases

• remains the same

Multiple Choice

Convert: 175 K to °C:

• -98 °C

• 79 K

• 230.9 °C

• -48.2 °C

Multiple Choice

100 °C = _____ K

• 173 K

• 373K

• 273 K

• 0 K

ways of thermal energy transfer

conduction

convection

radiation

Multiple Choice

John put a heat pack on his cold feet. What will most likely be the result?

• The cold from John’s feet will  be radiated into  the heat pack.
• The warmth of the heat pack will be radiated  onto John’s feet.
• The cold from John’s feet will be conducted  into the heat pack.
• The warmth of the heat pack will be conducted  onto John’s feet.

Multiple Choice

The sun shines down on this family as the play on the beach.

• conduction
• convection
• radiation

Multiple Choice

The way the heat is moving from the hot coffee is called...

• convection
• radiation
• insulation
• conduction

Multiple Choice

A group of friends gather around a fire to stay warm.

• conduction
• convection
• radiation

Multiple Choice

Warm air rises and the cool air sinks demonstrates this type of heat transfer. 

• conduction
• convection
• radiation
• Insolation 

Poll

How easy was it to understand the concept?

• very difficult

• difficult

• average

• easy