Unit 2: Physical Science B

This glass of lemonade is sitting in the hot summer sun. As time passes, in which direction will heat transfer take place?

air → lemonade

Zoe is frying eggs in a pan. The eggs cook because of _____ of heat. Zoe feels hot as she stands near the stove mostly because of _____ of heat.

Conduction, Radiation

Which example best represents translational kinetic energy? A. a plucked string on a guitar B. the moving blades of a ceiling fan C. a spinning top D. a tuning fork struck on a rubber block E. an apple falling from a tree

E. an apple falling from a tree

A worker is holding a filled gas cylinder still. Which two sentences are true about the energy of the filled gas cylinder? It has no energy because it's being held still. It has gravitational potential energy because of its height. Its atoms and molecules have thermal energy. It has motion energy because it will fall if let go. Its kinetic energy is being converted to potential energy.

It has gravitational potential energy because of its height. Its atoms and molecules have thermal energy.

John is riding a ski lift to the top of Wildcat Mountain. He removes his gloves and rapidly rubs his hands together to warm them up. What happens when John rubs his hands?

The particles in his hands vibrate faster because of friction.

Jeff has 10 grams of water and 10 grams of vegetable oil in separate containers. Both liquids have a temperature of 24°C. Jeff heats both liquids over a flame for five minutes. When he's finished, he discovers that the temperature of the oil increased more than the temperature of the water. What can Jeff conclude from this experiment?

Vegetable oil has a lower heat capacity than water.

Which form of energy increases when a spring is compressed?

elastic potential energy

When a pendulum is held high and taut and then is released, the pendulum begins to swing. What's the correct order of the energy transformations in this example? (PE stands for potential energy.)

gravitational PE → kinetic energy → thermal energy

A tennis ball is hit into the air with a racket. When is the ball's kinetic energy the greatest? Ignore air resistance.

just before it reaches the ground

Which two forms of energy does a hairdryer convert electric energy into?

motion energy thermal energy

The image shows street lights powered by solar panels. Which sequence shows the energy transformations taking place in these lights?

radiant energy → electric energy → radiant energy