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# Mrs. Rynolds

### Unit 7 Study Guide

Aristotle He proposed two main concepts associated with motion geocentrism and free fall
Geocentrism this is the belief that the planets and Sun revolved around Earth.
Galileo Galilei He helped to disprove Aristotle’s 2 claims of motion.
Heliocentrism this is the accepted belief that all the planets in our solar system revolve around the Sun.
Free Fall All objects, in a vacuum (no air resistance), fall at the same rate, regardless of mass of the object.
Sir Isaac Newton helped to create a field which involves force, energy, gravity, and motion of objects.
Gravity This is a natural phenomenon by which all physical bodies attract each other.
Weight This is the pull of gravity on an object.
Weight is measured in Newtons
The formula for Weight is W= mg
Buoyancy This is an upward force that is contrary to gravity.
All objects are affected by gravity
directly proportional The relationship between mass and gravity (Both values increase or decrease basically)
inversely proportional The relationship between distance and gravity (One value increases and the other decreases.)
Acceleration his term is used for the rate of change in the position of an object over time.
All objects accelerate at the same rate due to gravity
Accelerate This term refers to the increase in movement of an object.
Decelerate This term refers to the slowing in movement of an object.
Acceleration can be affected by mass and force
The heavier an object the more force needed to move or stop the object
The greater the amount of force the faster or slower an object will accelerate or decelerate
To decelerate an object requires a force working in the opposite direction
To accelerate an object requires the force to be in the same direction as the objects movement
Velocity This is defined as the rate of change in the position of an object.
Velocity It is measured in speed and direction.
Speed Defined as magnitude (amount) in velocity.
Direction north, south, west, east, up, down, left, right
Resistance This term refers to any opposite and opposing force to hinder or reduce movement.
Resistance can reduce velocity and cause deceleration of objects.
Inertia This term refers to the resistance of any physical object to any change in its current state of motion, speed, or direction.
Created by: S732596