Properties of Matter
A student places four objects near a magnet:
a steel paperclip
a plastic spoon
an aluminum can tab
a wooden stick
Which object will the magnet attract, and why?
The steel paperclip, because magnets attract objects made of iron or steel.
A student mixes sand and water in one cup and salt and water in another cup.
After stirring both cups, the student notices:
In Cup 1 (sand + water), the sand settles at the bottom.
In Cup 2 (salt + water), the salt seems to disappear.
Which cup contains a mixture and which contains a solution? Explain how you know.
Cup 1 (sand + water) is a mixture because the substances do not dissolve and can be easily separated.
Cup 2 (salt + water) is a solution because the salt dissolves and spreads out evenly.
If it's _ it's broken, if it's _ it flows.
open, closed
What type of energy produces vibrations?
sound energy
When you rub your hands together and they get warm, what type of energy transfer is happening?
motion > heat
Object A has a mass of 600 g and a volume of 400 mL.
Object B has a mass of 300 g and a volume of 900 mL.
Which object will require more force to move, and how do you know?
Object A, because it has the greater mass, and objects with more mass require more force to move—even if they have a smaller volume.
What makes a solution different from a mixture?
In a solution, one substance dissolves and spreads out evenly. In a mixture, the substances do not dissolve and can still be separated physically.
What are the three components every circuit must have?
power source (battery), wires (conductors), object to power on (bulb, buzzer, motor)
How does light travel?
in a straight light
Which of these is an example of energy being transferred through a system?
A. A plant growing in sunlight
B. A ball sitting still on the ground
C. A flashlight turning on
D. A book on a shelf
What is the transformation of energy?
C. A flashlight turning on
chemical > electrical > light + thermal
What is relative density?
Whether an object or substance will sink or float.
Why is matter “conserved” when students mix salt and water into a solution?
Hint: Conserved means kept the same or not lost.
Because the amount of matter (salt + water) stays the same even though it dissolves? The salt can be separated from the water by the process of evaporation.
What is the purpose of the switch in a circuit? Does every circuit have a switch?
To give the user the power to open and close the circit, no
Refraction = ?
Reflection = ?
bend, bounce
This force slows down moving objects and is strongest on rough surfaces like sandpaper.
Friction
What does it mean if a material is a good conductor of electric energy? Give 1 example.
A good conductor allows electrical energy to flow through.
Ex. copper, silver, gold, aluminum, iron, steel, mercury
Name a substance that will dissolve in water.
Salt, sugar, baking soda, powdered drink mix (like lemonade powder or Koolaid), food coloring, vinegar
This type of material, like metal, allows electricity to flow easily.
conductor
Draw an illustration of refraction
?
Equal or unequal?
Soccer ball siting on a field
Equal forces
Explanation: A soccer ball sitting still on a field has balanced forces acting on it — gravity pulls it down while the ground pushes up with equal force. Since the forces are equal, the ball does not move.
List 3 examples of a material that can insulate thermal energy or electric energy.
rubber, plastic, wood, glass, cardboard
A student mixes three substances into separate cups of water:
Cup A: Flour + water
Cup B: Sugar + water
Cup C: Sand + water
After stirring, the student notices that:
In one cup, the substance dissolves completely.
In another cup, the substance looks cloudy but does not dissolve.
In the last cup, the substance settles to the bottom.
Identify which cup is a solution and which cups are mixtures, and explain how you know.
Cup B (sugar + water) is a solution because the sugar dissolves and spreads out evenly.
Cup A (flour + water) is a mixture because it becomes cloudy but the flour does not dissolve.
Cup C (sand + water) is a mixture because the sand settles and can be physically separated.
This kind of energy powers things like lights, computers, and fans when it moves through a circuit.
electrical energy
What are the 6 forms of energy?
M
E
L
T
S
C
mechanical, electrical, light, thermal, sound, chemical
Equal or unequal?
Apple begins to fall off the tree
Unequal
Explanation: When an apple begins to fall off a tree, the force of gravity becomes stronger than the force holding it up, so the forces are unbalanced. That’s why it starts moving.