Matter, Matters
A rubber ball weighs 10 ounces before and after being warmed in the sun. What happens to its weight?
It stays the same, or does not change.
Which change most likely forms a new substance: melting ice or bubbles forming without heat?
Bubbles forming without heat
What force caused the toy car to slow down on the carpet?
Friction
Two balls are rolled for 5 seconds. Ball 1 rolls 5 mph. Ball 2 rolls 8 mph. Which ball will travel the most distance?
Ball 2 because it is moving faster.
What process causes water droplets to form on the outside of a cold window?
Condensation
A scientist removes a liquid toxin from a water sample. What happens to the weight of the remaining water?
The water weighs less because some mass was removed.
Why is mixing different-colored rocks NOT a new substance?
The rocks can still be separated.
Which wagon moves faster with the same force of push: one with 20 pounds or 30 pounds of bricks?
The 20-pound wagon
What is the equation to calculate speed?
speed = distance ÷ time
In a food web, what is an organism called that makes its own food?
A producer
A truck weighs 29 ounces empty and 35 ounces with two blocks. How much weight did each block add?
3 ounces
What are materials called that transfer heat quickly? Think about the metal handle on a pot.
Conductors
A student rolls a ball down two surfaces. Why did the ball roll farther on Surface 2 than Surface 1?
Surface 2 had less friction.
A graph shows an object staying in the same position for 2 seconds. What does this mean?
The object was motionless.
Why do zebras herd together in groups?
It is an instinctual behavior.
True or False: Heating an object usually changes its weight.
False
Why are metal pans often used for cooking?
Metal conducts heat well.
How does increasing mass usually affect motion?
More mass makes objects harder to move.
A truck moves 11 inches every second. How far does it travel in 4 seconds?
44 inches
Which body systems work together to deliver nutrients throughout the body?
The digestive and circulatory systems
Why does matter still have mass after it changes form or is separated?
Because matter is conserved and still exists.
A solid melts into a liquid when heated. Is this evidence of a new substance (physical or chemical)?
No, it is only a physical change.
What two forces can change how objects move.
Gravity and friction
A toy car starts at the 5-inch mark on a ruler and stops at the 45-inch mark after 5 seconds. What was the car’s speed?
8 inches per second
Why does western North Carolina usually get more snow than eastern North Carolina during winter?
Cold, dense air moves into the western mountains while warmer ocean air affects the east.