86 force and motion notes and calculations practice: glue notes here when done 11/05/2013 85...

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.

=-