CER's
What does each letter in CER stand for?
Claim, Evidence, and Reasoning
The ball rolls at a speed of 2 mph. Are the forces acting on the ball balanced or unbalanced?
Unbalanced - movement
True or false: velocity is always constant
False
How can any object be used as a reference point?
Does a ball at the top of a hill represent potential or kinetic energy?
Potential
Is this a claim or hypothesis?
We believe that strawberries grow faster than bananas
Hypothesis --> made before experiment (words "we believe")
Which planet has a larger gravitational force, Jupiter and Saturn, or Mercury and Venus?
Jupiter and Saturn
When you know the speed and direction of an object, you know the __________
acceleration
Why are reference points helpful for determining motion?
Allows us to get a clear understanding of how objects move
True or false: when I burn something, energy is gained from the action of burning
False - no energy can be created or destroyed!
True or false: qualitative data such as observations can be used as evidence
True!
Describe Newton's first law, AND state what it is also called
An object will resist any change in its motion (acceleration) until it is acted upon by an unbalanced force
Law of Inertia
True or false: both speed and direction have to change for acceleration to occur
False - only one of them have to change
What is motion measured in?
Speed
What are the four main types of potential energy we covered?
Chemical, nuclear, elastic, gravitational
If there are more trees, then there will be more wildlife.
Hypothesis --> if/then signifies that the writer isn't sure
What unit is mass measured in?
Kg
What is the difference between velocity and acceleration? Give an example of both. *Must get both parts correct for points*
Velocity is the speed of an object in a certain direction, while acceleration is the rate at which velocity changes over time
Speed of a car traveling north on a highway is velocity, while the car speeding up itself is acceleration
According to Newton’s third law of motion, when a hammer strikes and exerts force on a nail _____________________
Exerts an equal force back on the hammer
Name the main types of kinetic energy we covered and what they are (Must name all and correct description for points)
Electromagnetic kinetic energy: Energy that travels in waves
Sound kinetic energy: Movement of energy through vibrations of particles in wave
Electrical kinetic energy: The movement of negatively charged electrons, typically through a wire
How many sentences should the claim, evidence, and reasoning each be?
1, 3, and 3
What unit is weight measured in, and is weight constant?
Newtons (N), and no - it changes!
Does an object always have resultant velocity? Why or why not?
Technically yes, because the Earth is always moving!
On the formula triangle, which letter goes on the top, lower left, and lower right respectively? What do these letters stand for? *Must answer both questions for points*
D, S, T, distance, speed, time
Give examples for 5 of the 9 energy types we covered
Nuclear bombs (nuclear potential), rubber bands (elastic potential), charger (electrical kinetic), radio (electromagnetic kinetic), airplane taking off (sound kinetic energy)
Answers may vary