Other Chapters' Lyrics:

Earth Science 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 -:- Life Science 1 - 2 - 3 - 3b - 4 - 4b - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 -:- Physical Science 3

Other Chapters' Notes:

Earth Science 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 -:- Life Science 1 - 2 - 3 - 3b - 4 - 4b - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 -:- Physical Science 3

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Physical Science Chapter 3-Summary Notes

Motion and Forces

• Why are water parks so much fun?  Sliding down a slide and into the water.  Why does this happen?  It’s all based upon forces and motion.
• Speed is the rate of change in position and is described by the distance divided by time, or speed = distance/time.  (s = d/t)
• So if you know any of these two, you can calculate the third:
•             Distance = speed x time (d = s x t)
•             Time = distance/speed (t = d/s)
• Velocity (v) describes both speed and the direction.
• If one motorcycle is moving at 30 kilometers per hour west and the other motorcycle is moving at 30 kilomters per hour east, the speeds are the same but the velocities are different because their directions are different.
• If a car turns a corner at 30 miles per hour, its speed remains the same but its velocity is changing.
• Acceleration (a) is the rate of change of velocity.  So acceleration can occur by changing speed or direction.
• Acceleration = (the final velocity minus the initial velocity) divided by time, so a = vfinal –vinital/time.
• Force (f) is a push or a pull that one object exerts on another.
• Friction is the force that opposes motion between two surfaces.
• While weight depends on the gravitational force (you will weigh less on the moon than you do on earth), the mass of an object remains the same regardless of its location.  Mass refers to the degree of acceleration a body acquires when subject to a force, or mass = force/acceleration; m = f/a.