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Year In Review (8th grade)
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At the bottom of the highest hill of a rollercoaster, is there more potential or kinetic energy?
more kinetic energy because it is moving the fastest
At the top of the highest hill of a rollercoaster, is there more potential or kinetic energy?
more potential energy because it is higher off the ground
Name 2 of the 6 types of simple machines
inclined plane, wedge, screw, wheel and axle, pulley, lever
What is the purpose of a simple machine?
to make work easier to do
When you push against a wall, the wall pushes back against you. Which of Newton's Laws does this describe?
Newton's 3rd Law of Motion: Every action has an equal yet opposite reaction.
It takes more force to move a heavier object. Which of Newton's Laws does this describe?
Newton's 2nd Law: F = MA
A phone is sitting motionless on the table until you baby brother pushes it off the table. Which of Newton's Laws does this represent?
Newton's 1st law: An object at rest will stay at rest unless acted on by an unbalanced force.
If a soccer ball is sitting motionless on the ground, what type of force would cause it to move?
unbalanced force
In a tug of war, someone pulls with 20 N of force, and the other person pulls with 30 N of force. Is this a balanced or unbalanced force?
unbalanced
What is a push or pull on an object and is measured in Newtons?
force
True or false: An object accelerates when it speeds up, slows down, and changes direction.
True
What is the measurement of the change in velocity over time?
acceleration
What is a vector quantity?
measures magnitude (how much) and direction
Is speed a scalar or vector quantity?
scalar
Speed measures how fast something is going, velocity measures that and what else?
the direction the object is traveling
When are the distance and displacement of an object equal?
when motion is in a straight line
Is this a complete and accurate position? The adorable dog is 10 feet to the left of the angry cat.
Yes, there is distance, direction, and reference point.
What are the 3 things needed to describe a position?
distance, direction, reference point
As you move down the rows of the periodic table, what gets added each row?
a new electron shell
What are the electrons on the outer electron shell of an atom called?
valence electrons
type of matter in which atoms are far apart and collide with each other
gas
type of matter in which the atoms are packed tightly together and vibrating back and forth quickly
solid
What type of properties can be measure WITHOUT changing the identity of the matter: physical or chemical
physical properties
a type of mixture that is mixed evenly
homogeneous mixture
A substance made of only one type of atom.
element
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