Scientific Skills
Question: What is the term for an educated guess or prediction based on observations of what you think will happen in an experiment?
Answer: What is a hypothesis?
Define energy
Energy is the ability to do work.
Define energy transfer. Use the definition that would apply when you turn on a light bulb.
An energy transfer is the movement of energy from one place to another place.
Question: On a distance/time graph, a straight, diagonal line shows an object moving at a constant speed.
What does a flat, horizontal line on the same graph indicate about the object’s motion?
Answer: What is the object is at rest (not moving)?
Question: This type of wave needs a medium like air, water, or solids to travel.
Answer: What is a mechanical wave?
Question: Which scientific skill involves using your senses to gather information about the natural world and is described using numbers or amounts?
Answer: What is a quantitative observation?
As Felix rides his bicycle down the hill, what is happening?
(a) kinetic energy changing to potential energy
(b) electrical energy changing to kinetic energy
(c) potential energy changing to kinetic energy
(d) kinetic energy changing to electrical energy?
(c) potential energy is changing to kinetic energy
When you rub your hands together, what type of energy do you start with, and what type of energy do you finish with?
What is mechanical (kinetic) energy will change into thermal (heat) energy
Two Parts:
What is speed?
What is the equation for calculating speed?
Speed is the measurement of how fast an object's position changed in a given amount of time.
The equation for calculating speed is Speed = Distance/Time
Question: Sound waves are this type of mechanical wave where particles vibrate back and forth in the same direction the wave travels.
Answer: What is a longitudinal wave?
Question: When graphing experimental results, which variable is placed on the x-axis?
Answer: What is the independent variable?
Define potential energy.
Potential energy is stored energy.
Tell me what 2 types of energy is transformed when sound goes into the ear and on to the brain.
The sound energy moves through the ear, and converts to electrical energy to signal the brain!
Question: Two people are trying to move a refrigerator. One person is pushing to the right with a force of 25 Newtons and the other is pulling on the right side with a force of 15 Newtons.
What is the overall net force and direction of the refrigerator movement?
Answer: What is 40 Newtons and to the right?
Question: This part of the ear vibrates first when sound waves enter the ear.
Answer: What is the eardrum?
Question: In the hypothesis, "If plants are given more sunlight, then they will grow taller," what is the dependent variable?
Answer: What is the height of the plants?
Define kinetic energy.
Kinetic energy is the energy that an object has due to its motion.
What are the energy transformations that happen when you use an electric lamp? (hint, there should at least be three)
Electric energy will transform into radiant (light) energy and that will also release thermal (heat) energy.
Two carts are pushed with the same force, but Cart A has a mass of 2 kg and Cart B has a mass of 6 kg. Which cart will have the greater acceleration, and what Newton's Law Explains this?
What is: Cart A will have the greater acceleration because, according to Newton’s Second Law (F = m·a), acceleration increases when mass decreases if force stays the same?
Question: Through which medium does sound travel the fastest: solid, liquid, or gas?
Answer: What is a solid (Because the particles are closer together, allowing the sound waves to travel faster from 1 particle to the next)?
After observing a plant growing faster in sunlight than in shade, write a scientific claim about how light affects plant growth.
Answer: What is "Plants grow faster with more sunlight." or "More sunlight will help a plant grow faster or better." (answers may vary)
Complete this quote from Albert Einstein
"Energy cannot be created or _________ . It can only be ________ from one form to another."
Energy cannot be created or destroyed. It can only be changed from one form to another.
During a collision of two cars hitting each other, name at least 2 forms of energy that are present and transform into each other.
what is sound energy
kinetic/mechanical energy
thermal/heat energy
Question: If a car slows down FROM 25 m/s TO 15 m/s in 4 total seconds. What is his acceleration? (hint: use the acceleration formula)
Answer: What is -2.5 m/s/s (or m/s2)
Question: Explain how a sound wave in the air eventually becomes an electrical signal the brain can interpret.
Answer:
What is: sound waves vibrate the eardrum, the vibrations are amplified by the bones, the cochlea (organ of corti) changes the vibrations into electrical signals, and the brain interprets those signals as sound?