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.