States of
Matter
Matter
What are the three states of matter?
Solids, Liquid, and gas.
What is a mixture?
Two or more substances combined together.
What is a force that happens when two objects touch?
Contact force.
What is a force that can act on an object without touching it?
Noncontact Force
What is force?
A push or a pull
Which state of matter keeps its own shape? Solid, Liquid, or Gas?
Solid
Is sand mixed with water a mixture or a solution?
Mixture
Is pushing a door open a contact or noncontact force?
Contact Force
What noncontact force pulls objects toward Earth?
Gravity.
What can a force do to an object's motion?
It can change the object's motion.
What state of matter takes the shape of its container but keeps the same amount of space? Solid, Liquid, Gas?
A student stirs sugar into water until the sugar can no longer be seen. What formed?
A solution.
A student kicks a soccer ball. What type of force is being used?Additionally, is it a push or a pull?
A contact force—a push.
A magnet attracts a paper clip without touching it. What type of force is this?
Noncontact force.
A soccer ball is sitting still. A student kicks it. What happened to the ball's motion?
The force caused the ball to start moving.
A puddle of water sits outside on a hot day and slowly becomes water vapor. What change is happening?
Evaportation
A student mixes oil and water. After stirring, the oil forms a layer on top. Is this a solution? Explain.
No. It is a mixture because the substances do not completely dissolve.
A toy car is rolling across the floor and eventually stops. What contact force is acting against its motion?
Friction.
Two magnets have the same poles facing each other. What will happen?
They will repel, or push away from each other.
A bicycle is moving forward and the rider squeezes the brakes. What force causes the bicycle to slow down?
Friction.
Water droplets form on the outside of a cold glass. What caused the droplets to form?
Water vapor in the air cooled and changed into liquid water through condensation.
A student mixes a substance into water. The substance disappears and cannot be separated using a filter. What does this evidence suggest?
A solution formed because the substance dissolved completely.
A student pushes two identical boxes with the same amount of force. One box is on a smooth floor and one is on a rough carpet. Which box will be harder to move? Explain why.
The box on the carpet because the rough surface creates more friction.
A magnet pulls a metal object toward it without touching the object. Is this a contact or noncontact force? Explain.
Noncontact force because the magnet can attract the object without touching it
A student notices that a toy car moves faster on a smooth surface than on a rough surface. Explain how the surfaces affect the car's motion.
The rough surface creates more friction, which slows the car down. The smooth surface has less friction, so the car can move faster.