This length is the distance from peak to peak for waves.
What is the wavelength?
100
This type of simple machine is often used for loading trucks.
What is a ramp?
100
When a ball is thrown directly upward, which of the following is true?
A. Its kinetic energy is mostly converted to potential energy.
B. Its potential energy is mostly converted to kinetic energy.
C. Its kinetic energy is mostly converted to heat.
A. Its kinetic energy is mostly converted to potential energy.
100
A screw is simply this type of machine, wrapped around a central point.
What is a ramp? (inclined plane)
100
Pulling back a rubber band is a form of storing _______ energy.
What is potential (or elastic)?
200
Only electromagnetic waves can travel through this lack of a medium.
What is a vacuum? (or empty space)
200
Name the six simple machines.
What are the lever, ramp, wedge, screw, wheel and axle, and pulley?
200
If energy can be neither created or destroyed, what do we mean when we say "Don't waste energy?"
Don't convert energy into less useful forms, like heat.
200
How much work is done if a 20 N force is used to slide a box 4 meters?
What is 80 J?
200
Energy is a measure of an object's __________
What is "ability to cause change"?
300
ROYGBV stands for these colors.
What are Red, Orange, Yellow, Green, Blue, and Violet?
300
The main idea of all simple machines is to make work easier by using a smaller force over a ____________
What is "greater distance"? (longer distance)
300
When a car rolls down a hill, most of its potential energy converts to kinetic energy. Where does most of the rest of it go?
Heat (from friction)
300
How much work is done if an eighth grader pushes against a boulder with 200 N of force for 5 seconds but the boulder doesn't move?
What is 0 J work?
300
The equation for Kinetic Energy is KE = 1/2mv^2
Which has more effect, doubling the mass, or doubling the velocity?
Doubling the velocity (because it's squared)
400
Electromagnetic radiation moves outward in these directions.
What are "all directions"?
400
The crowbar and wheelbarrow are examples of this simple machine.
What is the lever?
400
You can use this instead of a dryer to dry your clothes to save energy.
Hang your clothes to dry
400
Using a lever, a clever eighth grader can lift a 500 N rock using only 10 N of force. What is the mechanical advantage of her lever system?
What is 50?
400
What is the kinetic energy of a 15 kg boulder resting at the top of a 12m cliff?
What is 0 J? (not moving = no kinetic energy)
500
We detect the visible spectrum as this.
What are colors?
500
We use this type of simple machine every day by turning a doorknob.
What is the wheel?
500
Your body uses the chemical energy in food to make this type of energy.
What is kinetic energy?
500
How much work is done to lift a 40 kg barbell to a height of 2 m?
What is 784 J of work?
500
What is the potential energy of a 15 kg boulder resting at the top of a 12m cliff?