Scientific Investigations
What is an independent variable?
The variable that is change or manipulated.
Force is...
A push or pull.
What are the two parts of motion?
Speed and direction.
What is energy?
Something that does work or causes change.
What type of circuit allows electricity to flow?
Closed circuit
What is a constant in an experiment?
A part of an experiment that always stays to same.
If an item has more mass, __________ (more/less) force is needed to move it.
More force is needed
What is a force that opposes motion?
Friction
When a player throws a baseball, __________ (kinetic/potential) energy is turned into _________ (kinetic/potential) energy.
Potential energy is turned into kinetic energy.
What is the purpose of plastic coating on electrical wires?
Plastic is an insulator
If a dog weighs two pounds and is 30 inches tall, what type of data is this?
Quantitative
Select all that apply. Force can cause an object to...
a. start moving
b. stop moving
c. not move
d. change directions
a, b, and d
If a child pulls the brakes on his bike, why does the bike slow down?
Friction from the brake causes the bike to slow down.
True or False - energy can be created or destroyed.
False!
Name two things you need to create a closed circuit.
A battery, wires, a switch, a light bulb
Johnny is doing an experiment to measure plant growth based on the amount of sunlight it receives. He puts one plant in direct sun outside, one in a closet, and one in his room. He waters each plant with 30mL of water each day and gives them the same amount of fertilizer. Johnny measures the plant growth every three days using a centimeter ruler. What is the dependent variable?
The plant growth.
Would a kite, tank, or Barbie need the most amount of force?
Tank
Would sandpaper or tile have the most friction if a car rolls across it?
Sandpaper
A wind turbine and a can opener are examples of what energy?
Mechanical energy
When you turn on a dryer, ___________ energy turns into __________ energy.
Electrical energy turns into thermal energy.
Sarah wants to see how far a car will go after changing the type of material it rolls over. She uses fleece, aluminum foil, and a piece of cotton ribbon. She keeps the height of the ramp, the car, and her amount of force to push the car the same. Sarah uses a meter stick to measure how far the car goes. What is the independent variable?
The type of material.
If a crate of Legos, an iPad, and a key were struck with the same amount of force, which would move the furthest?
The key
Unless acted upon by an opposing force, and object in motion tends to _________ in motion.
Stay
Radiant energy is what type of energy?
Light
Name three conductors
Coins, wire, paper clip, ring, water, etc.