Physical and Chemical Changes
Which process involves a decrease in temperature?
a. evaporation
b. boiling
c. condensation
d. melting
C. Condensation involves a decrease in temperature
What form of energy is in a battery?
Chemical Energy
Which is not an example of energy causing motion?
a. picking up a box
b. holding a box
c. placing a box on a shelf
d. placing a box on the floor
B. Holding a box
Because you are not changing its position
Name three insulators
Answers may vary but include:
* Glass
* Wood
* Rubber
* Diamond
* Plastic
What's a force?
A push or a pull
Give an example of condensation
Answers will vary, but may include:
* Liquid water forming outside a cold glass
* Wet dew in the mornings on the grass
* A cloud is made of condensation
* Any change from a vapor to a liquid
Which has the least amount of mechanical energy?
a. a ball rolling down a hill
b. a rollercoaster going up a hill
c. a child playing on a slide
d. a car parked in a parking lot
D. a car parked in a parking lot has the least amount of mechanical energy
Which described a change caused by the sun's energy?
a. A marshmallow toasts over a fire.
b. Water for tea is boiled on a stove.
c. Water in a rain puddle evaporates.
d. A light bulb glows when the switch is turned.
C. Water in a rain puddle evaporates
Name three conductors
Answers may vary but include:
* Copper
* Aluminum
* Steel
* Gold
* Any metal
* Salt water
Name two forces that can affect an object's motion without touching the object.
Gravity and Magnetism
How do substances change state?
A change in temperature
Which one is balanced?
a. a circus performer walking across a tightrope
b. a boy riding his bike for the first time
c. a student sitting very still
d. a baby taking his first steps
c. a student sitting very still
Balanced means no movement!
Is Earth's gravity a push or a pull? Explain why.
Earth's gravity is a pull because it brings everything towards the center of the planet.
Name something that transforms electrical energy into energy of motion
Answers may vary but include:
* a motor
* a fan
* a blender
* a washing machine/dryer
What force causes objects to slow down and eventually stop moving?
Friction
You can feel heat from friction by rubbing your hands together!
How can you tell if a chemical change has occured?
Answers may vary but include:
* A change in smell/odor
* A change in color
* A new material has formed
Which form of energy can by absorbed, reflected, or refracted(bent), by different materials?
Light Energy
Four friends are running a mile race. Each friend has the same mass. Here are their finish times:
Friend A - 20 minutes
Friend B - 18 minutes
Friend C - 14 minutes
Friend D - 12 minutes
Who had the most mechanical energy?
Friend D because he ran the fastest!
What three things do you need to build a circuit?
1. Power source
2. Conductor path
3. Energy receiver
Name two magnetic metals.
Answers can include:
* Iron
* Nickel
* Cobalt
Which is FALSE:
a. Rusting is a chemical change
b. Evaporation is a chemical change
c. Condensation is a physical change
d. Cutting wood is a physical change
B
Evaporation is actually a physical change
Name two forms of energy that a light bulb gives off
Light energy and thermal energy
There are two boxes:
Box A weighs 50 kilograms
Box B weighs 40 kilograms
Which box will be easier to move?
The one with less mass will be easier to move, so box B is easier to move!
Sandy built a circuit that would light a lightbulb. When she connected the wire to the battery, the light bulb didn't work. What is most likely the reason that the light build would not light?
a. The circuit was not continuous.
b. The wire was made of copper.
c. The switch was closed.
d. The battery has chemical energy.
Sandy's lightbulb didn't work because the circuit was not continuous.
Continuous means complete/closed.
Eli pushes a box with a force of 1 N and Judy pushes with 2 N in the opposite direction. What will happen to the box?
It moves toward Eli because Judy is pushing with more force