Matter and Kinetic Energy
In which state of matter are the atoms or molecules packed tightly together in a fixed position?
A. liquid
B. solid
C. all of the above
B. Solid
Why does oil float on water?
A. Oil is more dense than water.
B. Oil is less dense than water.
C. Oil is light.
B. Oil is less dense than water.
Which of the following observations results in a chemical change?
A. burning wood
B. boiling water
C. melting ice
A. burning wood
What is the effect of normal force on a ball resting on the ground?
A. It pushes the ball into the ground.
B. It pulls the ball upwards against gravity.
C. It keeps the ball stationary by acting opposite to gravity.
C. It keeps the ball stationary by acting opposite to gravity.
When you push against a wall, how does the wall react according to Newton’s
third law of motion?
A. The wall does not push back.
B. The wall pushes back with equal force.
C. The wall moves away from you.
B. The wall pushes back with equal force.
What happens to the atoms or molecules in a liquid as it gets warmer?
A. They move slower and come closer together.
B. They move faster and spread out more.
C. They change into a solid state of matter.
B. They move faster and spread out more.
If an object is suspended, or settles in the middle, in rubbing alcohol, what can
be said about its density compared to rubbing alcohol?
A. The object is less dense than rubbing alcohol.
B. The object is more dense than rubbing alcohol.
C. The object has the same density as rubbing alcohol.
C. The object has the same density as rubbing alcohol.
Which of the following is evidence of a chemical change?
A. changing phases from solid to liquid
B. formation of a new substance
C. change in color
B. formation of a new substance
How does a compass needle align itself?
A. Magnetism causes it to align with Earth's magnetic field.
B. Gravity pulls it to point north.
C. Applied force from Earth rotates it.
A. Magnetism causes it to align with Earth's magnetic field.
If two skaters push off from each other, what happens to their motion?
A. They both move in the same direction.
B. They both move in opposite directions.
C. Only one skater moves.
B. They both move in opposite directions.
If you were to cool down a gas, what would you expect to happen to the
kinetic energy of its atoms or molecules?
A. The kinetic energy would increase.
B. The kinetic energy would decrease.
C. The kinetic energy would stay the same.
B. The kinetic energy would decrease.
In an experiment, a student observes that a marble sinks in water but floats in
corn syrup. What does this tell you about the density of the marble?
A. The marble is more dense than water but less dense than corn syrup.
B. The marble is more dense than both water and corn syrup.
C. The marble is less dense than water but more dense than corn syrup.
A. The marble is more dense than water but less dense than corn syrup.
Which of the following is NOT an indicator of a chemical change?
A. change in color
B. formation of a precipitate
C. change in shape
C. change in shape
Which example below demonstrates air resistance?
A. a book resting on a table, held by gravity
B. a parachutist falling slower when the parachute opens
C. a magnet attracting a metal paperclip without touching it
B. a parachutist falling slower when the parachute opens
When a swimmer pushes off the wall of a pool, what happens to the
swimmer?
A. The swimmer moves towards the wall.
B. The swimmer stays still.
C. The swimmer moves away from the wall.
C. The swimmer moves away from the wall.
Which of the following best describes kinetic energy?
A. energy due to position or height
B. energy stored within chemical bonds
C. energy of motion
C. energy of motion
What does a wave transfer from one place to another?
A. matter
B. energy
C. heat
B. energy
Compare the energy types involved when a ball is thrown into the air and then
starts to come back down. Gravitational potential energy is converted into which type
of energy as the ball falls back to the ground?
A. chemical energy
B. kinetic energy
C. elastic energy
B. kinetic energy
Net force can be described as ________.
A. the overall force acting on an object
B. when an object is at rest
C. one force acting on an object
A. the overall force acting on an object
When a bird pushes down on the air with its wings, what is the reaction force?
A. The air pushes the bird down.
B. The air pushes the bird up.
C. The bird moves forward.
B. The air pushes the bird up.
When you eat food and then run, which type of energy transformation is
primarily occurring?
A. chemical to kinetic
B. gravitational to kinetic
C. elastic to kinetic
A. chemical to kinetic
What are the two main types of mechanical waves?
A. microwaves and sound waves
B. radio waves and water waves
C. transverse waves and longitudinal waves
C. transverse waves and longitudinal waves
Which set of terms are used to describe parts of a transverse wave?
A. crest and trough
B. crest and compression
C. trough and rarefaction
A. crest and trough
What is the net force acting on a book lying on a table if the force of gravity
pulling it down is 15 N and the normal force pushing it up is 15 N? Are the forces
balanced or unbalanced?
A. 0 N; forces are balanced
B. 30 N; forces are unbalanced
C. 15 N downward; forces are unbalanced
A. 0 N; forces are balanced
Imagine you blow up a balloon, then let it go. Air rushes out of the balloon as
the action force. What would be the reaction in this force pair?
A. The balloon stays in place.
B. The balloon moves in the direction of the air flow.
C. The balloon moves in the opposite direction of the air flow.
C. The balloon moves in the opposite direction of the air flow.