10.1
Which of the following is visible to a person only because light from another source reflects off it?
cloud
What kind of energy does a thermometer measure?
thermal energy
Carlita hangs two balloons from a desk. When they hang normally, they are close together but they do not touch. Carlita rubs both balloons with a wool cloth. What happens when she lets the balloons hang near one another?
They push one another apart.
An electric clock in a classroom will not run if it is not plugged into an electric outlet. What does the clock get from the electric current from the outlet?
energy
All electric circuits need certain components in order to work. Which of the following must be part of an electric circuit?
A copper wires
B light bulb or buzzer
C switch or circuit breaker
D battery or other source of current
battery or other source of current
One type of energy travels as a wave through matter. It causes particles to vibrate in the same direction that the wave travels. Which type of energy is it?
Sound
A person moves a heavy box across the floor. What best describes the type of energy transformation that occurs when the person uses her muscles to push the box across the floor?
chemical into kinetic
Oscar rubbed a balloon against his sweater. This caused the balloon to become negatively charged. Oscar held the balloon above small strips of paper. Some of the strips moved upward and attached to the balloon. Other strips moved away from the balloon. Which statement explains why this occurred?
A Positively charged strips of paper were attracted to the balloon, while uncharged strips of paper were repelled by the balloon.
B Negatively charged strips of paper were attracted to the balloon, while uncharged strips of paper were repelled by the balloon.
C Positively charged strips of paper were attracted to the balloon, while negatively charged strips of paper were repelled by the balloon.
D Negatively charged strips of paper were attracted to the balloon, while positively charged strips of paper were repelled by the balloon.
Positively charged strips of paper were attracted to the balloon, while negatively charged strips of paper were repelled by the balloon.
What is refraction?
When light passes from one object to another, light changes direction slightly.
When you walk into a dark room, you flip a switch on the wall and the lights come on. What is the purpose of the wall switch?
It closes a circuit so that electric current can flow through the lights.
John is hungry and eats an apple. Most of the energy he obtains from the apple is what type?
chemical
Joseph is riding a bike. The muscles in his legs use stored energy obtained from food to exert force on the pedals, moving the bike forward. How does Joseph’s pedaling change energy from one form to another?
It transforms chemical energy into energy of motion
Cecilia is combing her hair. She notices that her hair and the comb have developed an electric charge. What will happen when she holds the comb near a small, uncharged object?
The uncharged object will stay where it is.
There is only one fish in the fishbowl below. When Joseph looks down at the fish, the image he observes is closer to the surface than the actual location of the fish.
Which wave characteristic does Joseph’s observation demonstrate?
A. absorb
B. diffract
C. reflect
D. refract
refract
PART A
Some materials conduct electric current and other materials prevent the flow of electric current. Which object prevents the flow of electric current?
A salt water
B rubber eraser
C steel frying pan
D copper water pipe
PART B
Some materials conduct electric current and others prevent the flow of electric current. Which of these building materials is an electrical conductor?
A bolt
B brick
C carpet
D window
rubber eraser
bolt
When Luis burns wood in a campfire, the particles in the wood break down and energy is released. What type of energy does the wood contain before Luis burns it?
chemical
A bowling ball is rolled down a bowling alley. What action would increase the kinetic energy?
using a ball with a greater mass
Curtis uses a wool cloth to give a balloon a negative charge. What will happen when he holds the balloon near the wall, and why?
The balloon will stick to the wall because a negatively charged object is attracted to an uncharged object.
What is light reflection?
If you shine light on a surface, some of that light will bounce off, or be reflected by, the surface.
The plastic coating was stripped off the end of the electric wire:
PART A-
What is the purpose of the plastic coating?
PART B-
Why must the plastic be removed before this wire is used in an electric circuit?
PART A-
to insulate the electric current in the wire from people or objects
PART B-
so that electric current can pass between the copper wire and other parts of the circuit
Ginny picks up her backpack from the floor and puts several books in it. She then puts the backpack on her back and walks across the room toward her desk. She sets the backpack down on the floor next to her desk and begins doing her science homework. During which step does the potential energy of the backpack stay the same?
Carrying it across the room on her back
During a baseball game, a pitcher throws a ball and a batter hits it. The ball flies through the air, hits the ground, and rolls across the grass. The ball has both potential energy and kinetic energy in three of these situations, but it has only kinetic energy in one of the situations. When does the ball have only kinetic energy?
A when the pitcher throws it
B when the batter hits it
C when it flies through the air
D when it rolls across the grass
when it rolls across the grass
Mandy combs her hair with a plastic comb. This causes the comb to become negatively charged. Which of the following would all be attracted to the comb?
A a positively charged object and an uncharged object
B a negatively charged object and an uncharged object
C a positively charged object and a negatively charged object
D a negatively charged object, a positively charged object, and an uncharged object
a positively charged object and an uncharged object
Max wanted to know if a light bulb got hot when it was lit. He decided to do an experiment. He got a thermometer and a lamp. He recorded the air temperature near the unlit bulb. Then he turned on the lamp. He carefully held the thermometer near the bulb.
Which of the following will most likely happen to the air temperature near the lit bulb?
A. The heat from the lit bulb will lower the air temperature.
B. The heat from the lit bulb will raise the air temperature.
C. The temperature will stay the same.
D. The thermometer will get too hot and break.
The heat from the lit bulb will raise the air temperature.
Which statement accurately describes the parts of the wire?
A Copper and plastic are both good insulators.
B Copper and plastic are both good conductors.
C Copper is a good conductor, while plastic is a good insulator.
D Copper is a good insulator, while plastic is a good conductor.
Copper is a good conductor, while plastic is a good insulator.