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86 Force and Motion Notes and Calculations
Practice:Glue notes here when done
11/05/2013
85
11/05/2013
Starter:
Thinking about your vocabulary from yesterday, compare speed and velocity.
Application/Connection /Exit:
Speed Calculations
Force and Motion Notes and Calculations
November 4, November 4, 20132013
AGENDAAGENDA8.6 B8.6 B
I will be able to I will be able to differentiate differentiate
between speed, between speed, velocity, and velocity, and
acceleration while acceleration while reading and reading and
writing notes and writing notes and completing speed completing speed
calculations calculations
1 Starter1 Starter
2. Notes2. Notes
3. Calculations’3. Calculations’
4. Exit 4. Exit
Date Lecture/ Activity/ Lab Page10/28 Signs of a Chemical change 77-7810/29 Chemical Reactions Lab 79-8010/31 Test Review 81-8211/4 Force and Motion Vocabulary 83-84
Table of Contents
Motion & Speed Motion & Speed NotesNotes
TEKS 6.8B identify and describe the changes in position, direction and speed of an object when acted upon by unbalanced forces.
TEKS 6.8C calculate average speed using distance and time measurements
TEKS 6.8D measure and graph changes in motion
ForcesForces are are pushes or pulls pushes or pulls
needed to:needed to:
start start an an object object movingmoving
stop stop an an
object’s object’s
motionmotion
change the change the speedspeed or or directiondirection of of objectsobjects
MotionMotion is a is a change in change in
positionposition relative relative to another to another
object. object.
The The distancedistance an an object moves in a object moves in a given amount of given amount of timetime which which determines the determines the speedspeed..
Speed is Speed is measured in measured in units of units of metersmeters per per secondsseconds or or kilometerskilometers per per hourhour. .
The The formula formula for finding for finding speed is: speed is:
SpeedSpeed= =
distancdistance e
time time
Calculate this speedCalculate this speedA football field is about 100 m long. A football field is about 100 m long. If it takes a person 20 seconds to If it takes a person 20 seconds to run its length, how fast was the run its length, how fast was the football player running?football player running?
Speed = Distance ÷ Time Speed = 100 m ÷ 20 s Speed = 5m/s
Calculate the SpeedCalculate the Speed
A swimmer swims 20 m in 40 s. What A swimmer swims 20 m in 40 s. What is the swimmer’s average speed?is the swimmer’s average speed?
Speed = Distance/Time
Speed = 20m/40s
Speed = 0.5m/s
Calculate the DistanceCalculate the DistanceHow far does a bicycle travel at a How far does a bicycle travel at a speed of 15 m/s for 15 seconds? speed of 15 m/s for 15 seconds?
Distance = Speed x Time Distance = 15m/s x 15s Distance = 225m
Motion can Motion can be shown be shown in a in a graphgraph. .
An object moving An object moving very fast might very fast might have a graph that have a graph that looks like this: looks like this:
If a force is applied If a force is applied to a to a movingmoving object, object,
the object can the object can speed upspeed up, , slow slow
downdown or come to a or come to a stopstop..
A force can A force can also change also change the the directiondirection an object is an object is moving. moving.
VelocityVelocity is when is when a force changes a force changes the the speedspeed and and the the directiondirection an an object is moving.object is moving.
Net ForceNet ForceThe total of the The total of the
forces acting forces acting on an object.on an object.
Forces like Forces like gravitygravity or or buoyancybuoyancy can act of can act of
objects objects that are that are
notnot moving.moving.
Forces may Forces may be be balancedbalanced
or or unbalanced.unbalanced.
Balanced Balanced
forces do forces do
notnot result result
in a in a
change of change of
motion.motion.
EqualEqual forces in forces in opposite opposite
directions directions cancelcancel each other out so each other out so there is there is zerozero net net
force.force.
= 0-
Unbalanced Unbalanced forces forces always always result in a result in a change of change of motionmotion or or directiondirection..
AddAdd the forces the forces if they are in if they are in
thethe samesame direction.direction.
+ =
SubtractSubtract the the forces if they forces if they
are in are in opposite opposite
directions.directions.
=-