A wet shirt is put on a clothesline to dry on a sunny day. The shirt dries because water molecules:

Which sequence of energy transformations occurs after a battery-operated flashlight is turned on?

The diagrams show liquid water changing to water vapor in four different situations. Which observation would be evidence that the water is undergoing a phase change?

How is heat energy transferred within the liquid water in the pond?

A television set changes electrical energy to sound and light energy. In this process, some energy is:

*remember: energy can NOT be created or destroyed, only transferred!

Energy from the Sun reaches Earth mainly by the process of:

The diagram below shows the relative wavelengths for several types of electromagnetic energy.

Which type of electromagnetic energy has a SHORTER WAVELENGTH than ultraviolet waves?

*Hint- wavelength decreased on the chart from left to right!

The illustration below shows an example of energy changing forms. Which changes in energy form are illustrated in the diagram?

Which example best demonstrates the process of conduction?

*Hint- conduction works best in solids, by direct contact!

A ball is dropped from the roof of a building. Points A, B, C,

and D in the diagram represent positions of the ball as it falls.

At which position will the ball have the greatest kinetic energy?

Kinetic Energy= energy in motion

The pie chart below compares the amounts of energy from different sources used in the United States each year.

Which two energy sources together provide more than 50% of the energy needs of the United States?

Add up the sources to see which is greater than 50!

nuclear + natural gas = ...

oil + coal = ...

hydropower + oil = ...

natural gas + coal = ...

The diagram below shows a Bunsen burner heating a beaker of water on a beaker stand. The arrows represent the transfer of heat energy in the water.Which process is primarily responsible for the transfer of heat indicated by the arrows in the beaker of water?

*Hint! The arrows show WARM RISING and COOL SINKING (DENSITY DIFFERENCES!)

The diagram below, which shows two insulated Styrofoam cups of water connected by an aluminum bar. The thermometers show the temperature of the water in cup A and cup B at the beginning of a heat-flow experiment. Over the next 15 minutes, which changes would most likely occur?

*Hint! Heat transfers from HOT to COLD (from high to low). Eventually both temperatures will be EQUAL!

Which process is most responsible for the temperature changes that will take place?

Hint! The bar that is transferring the heat is an aluminum bar. Aluminum is a solid, metal.

Which statement best describes the energy changes that occur while a child is riding on a sled down a steep, snow-covered hill?

*Hint- The greatest potentional energy is at the TOP of the steep hill. The child is in motion as he is riding down the hill!

Water vapor (gas) changes to liquid water during which process?

A substance has a freezing point of –38°C and a boiling point of 356°C. At what temperature would this substance be in its liquid state?

Hint- The temperature has to be a number between –38°C and 356°C in order to be a liquid.

The diagram represents a weightlifter holding a barbell above his head. The barbell is not moving.

The force of gravity pulling down on the barbell is 756 newtons (N). How many newtons of force are exerted by the weightlifter to hold the barbell up?

*Hint- Equal and Opposite force!

According to the graph, what temperature does condensation occur?

*Hint! Look at the letter where condensation occurs (gas to liquid). Then look at the y-axis to find the temperature.

According to the graph, what temperature does freezing occur?

*Hint! Look at the flat line where the phase change freezing occurs then look at the temperature on the y-axis!

Between which two letters is the most energy being added?

*Hint- Look at the heat energy (x-axis). Between which two letters is there the most heat energy?

Is the phase change from C to B (right to left) endothermic or exothermic?

*Hint- ENDOTHERMIC = gain heat

EXOTHERMIC = loss of heat

Diagrams A and B show models of how the molecules of the same substance are arranged in two different phases of matter. Which phases of matter are represented by diagrams A and B?

The diagram shows one type of power facility that provides electricity for use in houses.

What phase change occurs in the boiler, if the boiler converts liquid water to water vapor (a gas)?

Identify fossil fuels that may be burned in the furnace shown. Check all that may applys

The diagram shows a dam and an electric power plant built next to a river. The power plant uses the water from the dam to generate electricity. Which is a positive impact of this type of power plant on the environment.

The diagram represents a person pulling a cart with a box on it. The arrow represents the direction in which the person is moving. Check all of the forces acting on the cart?

Why may the box may continue to move forward if the cart suddenly stops moving.

*Hint- Newton's Laws!

The graph represents the changes in elevation in meters (m) of a stream. Letters A through E represent locations in the stream at different distances in kilometers (km) from point A where the stream begins.

Identify the letter where the stream would have the greatest potential energy.

What is the distance from the beginning of the stream at Point A to Point B?

*Hint- Look at the Points A and B on the line. Use the x-axis interval to find the distance between them!

What is the distance from the beginning of the stream at Point A to Point C?

*Hint- Look at the Points A and C on the line. Use the x-axis interval to find the distance between them!

What is the distance from the beginning of the stream at Point A to Point D?

*Hint- Look at the Points A and D on the line. Use the x-axis interval to find the distance between them!

What is the distance from the beginning of the stream at Point A to Point E?

*Hint- Look at the Points A and E on the line. Use the x-axis interval to find the distance between them!

Which is a nonrenewable resource?

Which is a renewable resource?