Motion
Its velocity stays the same
What does Newton's 1st Law of Motion say?
An object in motion will stay in motion unless a force changes that
What is the difference between kinetic and potential energy?
Kinetic energy is in motion, while potential energy is stored
What is a hypothesis?
An educated, testable guess
What are the three ways thermal energy transfer occurs?
Conduction, convection, and radiation
What's the difference between average and instantaneous speed?
Average speed is overall, but instantaneous is speed at a single moment in time
What does Newton's 3rd law of motion say?
For every action force, there is an equal and opposite reaction force
Energy is the ability to do work
What is a theory?
A well-tested hypothesis
What kind of wave is a sound wave?
Longitudinal
Is velocity vector or scalar? How do you know?
It's a vector because vectors have direction
What does Newton's 2nd law of motion say?
F = ma
Calculate the answer: A hot air balloon is flying 60 meters above the ground. If the mass of the balloon is 800 kilograms, and gravity is 10 m/s2, what is the object's potential energy?
480,000 J
What is the difference between precision and accuracy?
Precision is how close your measurements are to each other, but accuracy is how close your measurements are to the target or "real" number
Turn this speed into a velocity: 150 km/hr. (You can be creative with this one!)
What is the speed of a remote control car that goes 10 meters in 4 seconds?
2.5 m/s
A boy lifts a 5 kilogram dog onto a couch at an acceleration of about 0.5 m/s2. How much force does he do?
2.5 N
Calculate the answer: A 70-kilogram runner goes a speed of 3 m/s. What is his kinetic energy?
315 J
What is the difference between independent and dependent variables?
Independent variables are what you change in an experiment, but dependent variables change because of the independent variable
What is the difference between reflection, refraction, and diffraction?
Reflection: Light bounces off a surface and produces an image
Refraction: Light bends when it enters a new medium
Diffraction: Light scatters when it passes around an edge or through a narrow opening
What is the acceleration of a falling object that increases speed from 0 to 49 m/s in 5 seconds? (You can round your answer to the next whole number if you want.)
9.8 m/s2
Describe what gravity and friction do to objects.
Gravity: Pushes/pulls objects down to earth
Friction: Slows down or stops objects
Draw an EM wave and label it in order with the correct wavelength of radiation.
Word bank: Gamma, IR, x-rays, radio, visible light, UV, microwaves
Correct order: radio, microwaves, IR, visible light, UV, x-rays, gamma
Why is being able to test a hypothesis important?
Without testing a hypothesis, it will never have evidence to support or contradict it and it could be completely wrong.
Marissa measures the temperature of a liquid to be 80 degrees Celsius, 95 degrees Celsius, and 72 degrees Celsius with three different thermometers at the same time. The actual temperature of the liquid is 81 degrees Celsius.
Is she precise? Is she accurate?
Precise - No, her measurements are far apart
Accurate - Her measurement of 80 degrees Celsius is pretty accurate, but the others are not.