Matter Matters
This property tells whether an object is a solid, liquid, or gas.
Physical State
Sand and small rocks are combined in a cup. This is an example of this type of matter.
Mixture
All matter is made of extremely small pieces called these.
Particles
A push or a pull is called this.
Force
Scientists repeat trials because doing so makes their results more this.
Reliable/Trustworthy
A paper clip is attracted to a magnet, but a plastic button is not. The objects are being compared by this property.
Magnetism
A student mixes iron filings and sand. Which property could be used to separate the iron from the sand?
Magnetism
In which state of matter are particles packed closely together and mainly vibrating in place?
Solid
Two students push a box in opposite directions with exactly the same amount of force. The forces are described as this.
Balanced Force
A student changes how hard she pushes a toy car and measures how far it travels. What is the variable she purposely changes?
The amount/strength of the force.
Sugar seems to disappear when stirred into water. This property describes its ability to dissolve.
Solubility
Salt is stirred into water until it can no longer be seen. What has formed?
Solution
Which state has particles that stay close together but can move past one another?
Liquid
A soccer ball rolling across grass gradually slows down because of this force.
Friction
A student tests the effect of force on a toy car. Why should the same car and same surface be used for every trial?
To keep other variables controlled so the force is the main thing being tested.
Two objects have the same size. Object A sinks in water while Object B floats. Which property provides evidence explaining the difference?
RELATIVE Density
Saltwater has a mass of 250 g before the water evaporates. After evaporation, the salt remains, but much of the water has become water vapor. What happened to the matter?
It was conserved; the matter still exists even though some have changed location/state.
Draw three particle models for a solid, liquid, and gas. Which model should have particles spread farthest apart?
Gas
A cart is pushed with 10 N to the right and 4 N to the left. Which direction will the cart's motion change?
To the right, because the forces are unbalanced.
A cart travels 40 cm after a small push, 85 cm after a medium push, and 130 cm after a large push. What pattern does the data show?
Increasing the force increased the distance traveled.
A student needs a material for the handle of a pot so the handle does not become hot quickly. Should the material be a good or poor thermal conductor? Explain.
It is a poor thermal conductor/insulator because it does not transfer heat easily
A student says, “When sugar dissolves in water, the sugar no longer exists.” Give evidence that disproves the student's claim.
The sugar particles remain in the solution and can be recovered, such as by evaporating the water.
A sealed bottle appears empty, but a student cannot squeeze the bottle completely flat. What does this provide evidence for?
Air is matter made of particles that take up space.
A student releases a toy car at the top of a ramp. Name two forces acting on the car and explain how each affects its motion.
Gravity pulls it downward/down the ramp; friction acts against its motion and can slow it.
Two groups perform the same force investigation but get different results. Name two things they should check before deciding which result is correct.
Examples: controlled variables, measurement methods, number of trials, procedure, equipment, or whether results were recorded accurately.