Electrical Charged Objects
Mrs. Lockman tapes a piece of string to each of two ping-pong balls. She hangs the balls so that they are close to one another but do not touch. Later, she finds that they have pulled together. They are now touching. What reasoning could explain why the two balls are now touching?
They have gained opposite charges.
What form of energy cooks food in a solar cooker?
light energy
To conserve energy or if they don’t have a clothes dryer, some people hang their laundry outside to air dry. Which of the following is the most optimal day to hang laundry?
a warm, sunny day
A material that allows an electric current to flow through it is an electrical conductor. A material through which an electric current cannot flow easily is called an insulator. Which claim best describes the difference between an insulator and a conductor?
An insulator does not have electrons that are free to move, and a conductor does.
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
Aisha wanted to know how positive and negative charges affect balloons. The balloons shown below are part of her investigation. The balloons are touching. What are the charges on the balloons?
They are both negative.
An object that has thermal energy can lose some of that energy. Which answer describes an example of the thermal energy of a material decreasing?
water freezing into ice
A book sitting on a shelf. Which type of energy does the book have because it is on the shelf?
potential
Which is true about how a charged object interacts with a neutral object?
They attract each other.
Darrell made toast for breakfast by putting a slice of bread into the toaster and turning it on. Which energy transformation did he use to make a piece of toast?
electrical energy into heat energy
Curtis uses a wool cloth to give a balloon a negative charge. Which claim and reasoning describes 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 effect does decreasing the number of coils around the nail have on the strength of the electromagnet?
It becomes weaker.
Suppose someone caused the book to fall from the shelf to the ground.Compared to the total sum of kinetic and potential energy the book has while on the shelf, about how much would it have when it is halfway from the shelf to the ground?
the same amount
At which part of an electrical grid is electrical energy produced from other types of energy?
generating station
Which energy transformation occurs when a fan is plugged into a wall?
electrical energy into energy of motion
In a three-pronged plug, one flat prong carries current from the supply that enters the electrical outlet, and the other returns the current to the service panel of the building. The round prong helps protect people from electrical shocks.What has a purpose similar to that of the round prong?
the plug's plastic covering
What type of energy does a Solar Power Calculator use?
Light Energy
Which types of energy does the spring toy have as it flies through the air?
kinetic and potential
What types of energy is used when throwing a ball?
Potential and Kinetic and Mechanical.
You use energy transformations every day. Which of these is a way that you would use the transformation of electrical energy to motion energy?
taking an elevator to the top of a tall building
Why do two socks sometimes stick together in a dryer?
Electrons move from one sock to another.
What makes up Mechanical Energy?
Kinetic energy plus potential Energy
What is the transfer of energy for a stereo?
Electrical transferred to mechanical transfered to sound.
What type of energy is being used when Mrs. Lockman drinks her coffee?
Chemical Energy
What uses light energy to thermal energy?
Solar powered water heater.