Physics Final 8th Grade
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34 Terms
Normal Force. What exerts it?
Support force exerts against an object that is in contact with a stable force
Wall, ground, table
Gravity
A force that pulls an object towards another
Friction. Where is it exerted?
A force that opposes motion between two objects that are in contact
Friction is exerted in the opposite direction
Applied Force
When someone or something applies force against an object.
Balanced Forces
Equal forces act on an object in an opposite direction
Unbalanced Forces
A force causes a change in motion in an object
Unit for Force
Newtons
Forces In Same Direction
Add
Forces In Different Directions
Subtract
Vectors
Have magnitude and direction
Newton's Laws of Motion
1st law (Law of inertia): An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
2nd law: F=ma
3rd law: For every action there is an equal and opposite reaction
All things fall with what acceleration
9.8m/s^2
Unit For force
Newtons
Unit For Velocity/Speed
m/s
Unit For Position/Displacement/Distance
Meters
Acceleration
m/s²
Energy
Joule (J)
Mass
Gram (g)
Newton's Law of Gravitation
Every particle attracts every other particle in the universe with a force that is proportional
What is weight and how does it change on different planets
Objects weight depends on its mass and how much gravity pulls it. Different planets have different gravity so weight changes
Electric Force
A repulsive or attractive interaction between any two charged bodies
Protons Have What Type of Charge
Positive Charge
Electrons Have What Type of Charge
Negative Charge
What do opposite and same charges do
Opposite charges attract, Same charges repel each other
Why does a balloon stick to the wall after you rub it on your head
adding a surplus of electrons
What is magnetic force?
A result of the electromagnetic force
Every magnet has what?
Every magnet has a south and north pole
What is energy?
The force that causes things to move
unit for energy
Joules
What is potential energy?
The energy that is stored in an object
What is kinetic energy?
The energy of motion
Law of Conservation of Energy
Energy cannot be created or destroyed
Formula for kinetic energy
KE = ½mv²
Formula for potential energy
PE= mgh (mass)(9.8 N/kg)(height in m)