When a fan changes electrical energy into motion this transformation is ____________.
A. thermal energy
B. radiant energy
C. mechanical energy
D. kinetic energy
C. mechanical energy
A student notices that a fully blown-up beach ball with air feels firm when touching it.

Which statement is true?
A. Air is matter because it can be felt.
B. Air is matter because it takes up space.
C. Air is not matter because it cannot be seen.
D. Air is not matter because it does not have mass.
B. Air is matter because it takes up space.
What is a push or pull exerted by one object on another?
A. Friction
B. Force
C. Shape
D. Motion
B. Force
When building a circuit and the light bulb is on, the circuit is
A. open
B. broken
C. static electricity
D. closed
D. closed
When a guitar string is plucked, it vibrates. These vibrations cause —

A. electricity to flow
B. sound to be produced
C. light to be created
D. air to stop moving
B. sound to be produced
Ice cream melts when its thermal energy:
A. decreases
B. stays constant
C. decelerates
D. increases
D. increases
A group of friends get together to watch a movie. Some of the foods they eat are celery, salsa, apples, and water. Which item is a mixture?
A. Apples
B. Salsa
C. Water
D. Celery
B. Salsa

Which roller coaster will NOT have enough kinetic energy at the bottom of the first hill to carry the car over the second hill?
C
A student grouped the following objects for his science fair project. Which of the following does the grouping represent?
A. Metal items and paper items
B. Man-made and natural resources
C. Conductors and insulators
D. Solids and liquids
C. Conductors and insulators
Sound cannot travel through a _________ because there are no particles to vibrate.
A. vacuum
B. solid
C. liquid
D. gas
A. vacuum
The sun's light energy shining in the window is an example of:
A. thermal energy
B. radiant energy
C. mechanical energy
D. electrical energy
B. radiant energy
A student observes what happens to a glass of water after adding salt.

Which two describe what the student observes after adding salt to the water?
A. A gas
B. A mixture
C. A solid
D. A solution
E. A substance
B. A mixture
D. A solution

A cyclist resting at the top of a hill. He is facing the bottom of the hill, so he has —
A. kinetic energy
B. friction
C. potential energy
D. motion
C. potential energy
What part of a circuit can open and close the flow of electricity through the circuit?
A. wire
B. bulb
C. plastic coating on the wire
D. switch
D. switch
The number of vibrations per second is called the ________ of the sound.
A. pitch
B. frequency
C. amplitude
D. volume
B. frequency
During a science experiment, Jenna used a rubber band to launch a toy car. The rubber band was stretched and then released, causing the car to move forward. Which statement best explains what happened to the energy in this experiment?
A. The energy disappeared once the rubber band was released.
B. The energy was destroyed when the rubber band stopped moving.
C. The energy in the stretched rubber band was transformed into motion energy in the car.
D. The energy was created when the car started moving.
C. The energy in the stretched rubber band was transformed into motion energy in the car.
Which statement about atoms is true?
A. Atoms only exist in living organisms.
B. Only visible objects are composed of atoms.
C. All types of matter are subdivided into particles called atoms.
D. All solids are composed of atoms, but liquids and gases are not.
C. All types of matter are subdivided into particles called atoms.

The two sides are pulling on the rope with a net force of zero. If the net force remains zero, which team will win the tug of war?
A. the team on the left will win the tug of war
B. the team on the right will win the tug of war
C. neither team will win the tug of war
C. neither team will win the tug of war
A comb is rubbed with a piece of wool fabric and placed next to some scraps of paper. The paper moves toward the comb. The movement of the paper is caused by —
A. Chemical energy
B. Magnetic attraction
C. Mechanical energy
D. Static Electricity
D. Static Electricity
In which medium does sound travel the fastest?

A. Air
B. Water
C. Metal
D. Outer space
C. Metal
Which energy transformation most likely occurs in a steam iron?
A. Electrical energy changes to sound energy.
B. Electrical energy changes to thermal energy.
C. Mechanical energy changes to light energy.
D. Mechanical energy changes to thermal energy.
B. Electrical energy changes to thermal energy.
A student places a 100 gram scoop of ice cream in a bowl. Twenty minutes later, the student checks the bowl and sees that about half of the ice cream has melted. What is the total mass of the frozen ice cream and liquid ice cream in the bowl?
A. 50 grams
B. 100 grams
C. 150 grams
D. 200 grams
B. 100 grams
Which image identifies the force of friction on the crate as the man pulls it across the ground?
A. 
B.
C.
D.
B.
An electric current flowing through a wire creates _________.

A. static electricity
B. a magnetic field
C. an open circuit
D. an insulator
B. a magnetic field
Which model best shows how sound waves move through air?

A. Waves moving up and down like ocean waves
B. Particles vibrating back and forth in the same direction as the wave
C. Arrows showing light rays bouncing off a mirror
D. Particles spinning in circles
B. Particles vibrating back and forth in the same direction as the wave