Random 1
What does it mean if a ball is just sitting at the highest top of the hill?
A) Less potential energy
B) Greatest potential energy
B) Greatest potential energy.
For thousands of years, people have used the power of water to do work. One example is a hydroelectric dam. Hydroelectric dams, like the one shown below, use water to generate electricity.
Which of the following best explains why people can use water to generate energy?
A. Water flowing downhill has energy.
B. Water contains a lot of heat energy.
C. Water is a good conductor of electricity.
D. Water easily absorbs energy from the Sun.
A. Water flowing downhill has energy.
In a hydroelectric dam moving water flows downhill and is used to turn turbines, start a generator, and create electricity.
Shayna and Mike are making a list of electrical appliances that people use in their homes. Here are four things on their list. Which of the objects was designed to convert electrical energy into useful heat energy?
A. fan
B. lamp
C. radio
D. toaster
D. toaster
Electrical energy is transformed into heat energy. The toaster used electrical energy that is transformed to heat energy to toast the bread.
Katie and her family are watching a fireworks display at an outdoor Fourth of July celebration. The fireworks store chemical energy, and when they are set off, they give off two forms of energy: light and which of the following?
A. electrical
B. mechanical
C. solar
D. sound
D. sound
Fireworks change chemical energy into light and sound energy when they are set off.
Which form of energy will cause a popsicle to melt?
A) Chemical
B) Heat
C) Light
D) Sound
B. Heat
Cora has a homework assignment to create a list of examples in which energy can be shown to cause a change.
Which of the following should NOT be included in Cora's assignment?
A. the Earth revolves around the Sun
B. a man stands on the surface of the Earth
C. a satellite orbits the Earth at a constant speed
D. a meteorite falls through the Earth's atmosphere
B. a man stands on the surface of the Earth
Energy has the ability to cause motion or create change. A man standing (not in motion) has only stored energy. The examples shown in the box are all forms of mechanical energy (energy of motion).
Why are you able to see yourself in a mirror when looking at it?
A) Light rays are absorbed.
B) Light rays are reflected.
C) Light rays are stopped.
D) Light rays are bent.
B) Light rays are reflected.
Solar power is a technology that relies on a renewable energy resource. Solar power changes energy from the Sun into a form of energy that can be used to heat our homes and run household appliances.
What form of energy must solar energy be changed into in order to run household appliances?
A. chemical
B. electrical
C. light
D. thermal
B. electrical
Light energy from the sun is captured by solar panels and converted into electrical energy to run household appliances.
How do you know if mechanical energy is happening?
If something is moving.
Jose is making this chart of examples of actions in which energy has caused change, as shown below. He accidentally added one that should NOT have been listed. Which action should Jose have left off his chart?
A. dropping a book
B. holding a cup
C. rolling a ball
D. opening a door
B. holding a cup
Energy has the ability to cause motion or create change. Holding a cup has only stored energy (not in motion). The examples shown in the box are all forms of mechanical energy (energy of motion).
What type of energy does a book have when it is sitting on a shelf?
a. Potential
b. Electrical
c. Kinetic
d. Chemical
A. Potential
In many electrical factories, fossil fuels are burned to boil water and generate steam. This steam is then used to help generate electricity. What type of energy is given off by the fossil fuels and used to boil the water?
A. chemical energy
B. heat energy
C. light energy
D. sound energy
B. heat energy
When burning fossil fuels chemical energy is turned into heat energy (steam) to power a generator to make electricity.
What form of energy is happening when there's a fire burning?
A) Potential Energy
B) Chemical Energy
C) Kinetic Energy
D) Sound Energy
B. Chemical Energy
Hugh is looking out his window and notices leaves moving in the trees across the street. Which of the following explains where the leaves get the energy required to cause this movement?
A. Gravity pulls the leaves back and forth.
B. The Sun radiates heat into the leaves.
C. The leaves undergo photosynthesis.
D. Wind transfers energy to the leaves.
D. Wind transfers energy to the leaves.
Wind energy can be described as air in motion. When the wind blows its energy is transferred to the leaves causing them to move back and forth.
. What type of energy causes particles to vibrate in the same direction that a wave travels?
a. Mechanical
b. Chemical
c. Potential
d. Sound
D. Sound
Bobbie is playing with his radio-controlled car by using a handheld remote box. What type of energy is being used to power Bobbie's car?
A. chemical energy
B. electrical energy
C. heat energy
D. mechanical energy
B. electrical energy
In a remote control chemical energy is exhibited through the use batteries and converted to electrical energy.
When there's a high pitch sound taking place, what are the sound vibrations doing?
A) Moving Slowly
B) Moving Faster
B. Moving Faster
Shawn's teacher asks him to think of several actions from soccer practice that show how energy causes changes.
Which of the examples below shows a change caused by applying energy?
A. kicking the ball
B. sitting on the ball
C. resting his foot on the ball
D. holding the ball in his hands
A. kicking the ball
Energy has the ability to cause motion. When a soccer ball is kicked mechanical energy is applied and causes the ball to be set into motion.
Which one of these battery-powered items uses the energy of the battery to create motion?
a) Radio
b) Phone
c) Flashlight
d) Fan
D. Fan
Amber visits a theme park that has a roller coaster that travels upside down. Which of the following is the best explanation for why the roller coaster car stays in contact with the track when it travels upside down?
A. The track and car are held together by a series of strong magnets.
B. The car has large amounts of thermal energy that binds it to the track.
C. The car has chemical energy that resists the effect of gravity when it is upside down.
D. The car has mechanical energy and is fast enough that gravity cannot pull the car down.
D. The car has mechanical energy and is fast enough that gravity cannot pull the car down.
Mechanical energy is energy gained by the physical movement in position of an object. As the rollercoaster moves fast on the track, it overcomes the force of gravity.