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PPT – Force and Newton PowerPoint presentation | free to view - id: 6ad3ad-YTIwY

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Scenario

Three students, Fred, Tom and Bobby, are running

in a 100 meter dash. It took Tom 10 seconds to

run 50 meters, while Bobby ran it in 12 seconds

and Fred ran it in 15 seconds

Think --- Pair --- Share

- Which student is running slower?
- Which student will probably win the race?
- Could another student still win the race?

Explain. - What are some other everyday examples of speed,

velocity and acceleration?

Activity

Balls trip to the Wall Balls trip from

the Wall

Distance (centimeters) Time (seconds) Speed Forward or Backward? Velocity (,-)

Distance (centimeters) Time (seconds) Speed Forward or Backward? Velocity (,-)

Physics the study of the relationship between

matter and energy

Motion

- A change in position in a certain amount of time
- Motion is relative. To know you are moving, you

must have a reference point - Distance how far you traveled
- Units for distance??

Distance vs. Displacement

- The distance between the final position and

starting position is displacement - (Ex hiking on a trail. The trail may be 1 mile

long but you may only end up 300 ft from where

you started)

Speed Equation

- Speed the distance traveled divided by the time

needed to travel that distance - SI Unit is meters per second (m/s)
- Other Units?
- Speed distance
- time

Practice (Make sure you use the proper units)

- If it takes you 3 hours to travel 60 miles, what

is your speed?? - If you are running 3 miles in 30 minutes, what is

your speed?

Constant speed vs. Average speed

- Constant speed an object covers equal distances

in equal amounts of time - The speed of moving objects is not always

constant - Average speed total distance
- total time

Graphing Speed

Draw the Following Graph

Velocity

- Velocity Speed in a given direction
- You can be going the same speed but two different

velocities - Velocity distance direction
- time

D

T

V

Acceleration

- The change in velocity divided by the time the

change occurs - A Velocity(final) Velocity(initial)
- Time
- Acceleration is speeding up, slowing down or

changing direction

Stop Here!!!

Day Two Force!!!

Force

- A force is a push or pull exerted on an object
- Force is measured in Newtons (kg m/s2)
- In order for an object to speed
- up, slow down or change direction,
- a force has to act on that object
- Inertia is the objects tendency
- to resist changing its motion. The
- more inertia, the harder it is to start
- moving or slow it down

Total Force

- Forces almost always act in pairs with one force

acting on either side of the object - The resulting force that exists between two is

the net force

Balanced Forces

- Balanced forces exist when the total force is

equal to zero. - Balanced forces do not change an objects motion

Unbalanced Forces

- When a net force acts on an object, they are said

to be unbalanced. - Unbalanced forces can cause an object to start

moving, stop moving, or change direction.

Problem A

225 N

225 N

Net Force

Unbalanced

Problem C

50 N

100 N

50 N

0 N

Net Force

100 N

Balanced

Problem D

792 N

400 N

632 N

900 N

100 N

224 N

1524 N

Net Force

Unbalanced

Friction and Air Resistance

- Friction is the force between two objects in

contact that resists motion between two touching

surfaces - It is what eventually causes things to slow down

and stop - Air Resistance is a form of friction between an

object and air molecules

Gravity

- Gravity is the pull that all matter exerts on

other matter - Gravity is dependent on the mass of an object and

the distance between the two objects - The greater the mass, the more gravitational pull

it will have (i.e. earth vs. moon) - The greater the distance, the less gravitational

pull it will have - Mass vs Weight weight is the amount of

gravitational pull on a person. So on the moon,

your mass would be the same but weight would be

different

Free Fall and Terminal Velocity

- When the only force acting on an object is

gravity, the object is said to be in free fall - On earth, this is 9.8 m/s2 - Gravity constant
- In the absence of air resistance, all objects on

Earth accelerate at the same rate, regardless of

their mass. - An object reaches its terminal velocity when the

force of gravity is balanced by the force of air

resistance

Tuesday, November 9

Objective What are you learning today?

- Students will be able to Practice problems

about Force and Motion - Worksheet on Force and Motion
- Brainstorm ideas for project

Sir Isaac Newton (4 January 1643 31 March

1727)was an English physicist, mathematician,

astronomer, natural philosopher, alchemist, and

theologian, and is considered by many scholars

and members of the general public to be one of

the more influential people in human history. His

Philosophiæ Naturalis Principia Mathematica

(Latin for "Mathematical Principles Of Natural

Philosophy" usually called the Principia),

published in 1687, is probably the most important

scientific book ever written. It lays the

groundwork for most of classical mechanics. In

this work, Newton described universal gravitation

and the three laws of motion, which dominated the

scientific view of the physical universe for the

next three centuries.

Warm Up

Read the following

Things to do

- Take out your notebook

Newtons Laws

Newtons First Law of Motion

- An object at rest will remain at rest and an

object in motion will maintain its velocity

unless it experiences an unbalanced force. - This is often times called the law of Inertia

Newtons Second Law of Motion

- The unbalanced force acting on an object equals

the objects mass times its acceleration - Fma
- Force is measured in Newtons (kg m/s2)

Newtons Third Law

- For every action force, there is an equal and

opposite reaction force

In your notebook.

- Draw or explain an example of each of Newtons 3

Laws.

Gravity Demo

Warm Up 11/16 Write QA

- How much time does it take for a snail to crawl

20 feet if he goes 2 feet/hr - Make sure you have turned in your speed problems

worksheet!!!

Warm Up 11/11

- Get a calculator and begin calculate your speeds

for the 4 activities - Remember Speed Distance/Time
- Round everything to the nearest hundreths (ex.

5.45s) - Make sure and list your units in your answers

Warm Up 11/13

- What is the formula for finding speed?
- What is the formula for finding distance?
- What is the formula for finding time?
- Remember 2nd Law FMA

Warm Up 11/10 Write QA

- What is speed?
- How do you calculate it?

Warm Up 11/4 Write QA

- Write an example of something that goes along

with each of Newtons Laws - Ex
- 1st - A car will sit at a stoplight until you

press the gas - 2nd - It is harder to carry a box of rocks than a

box of popcorn - 3rd - When birds fly, they push their wings down

in order to go up

Warm Up 11/4

- List 5 Examples of motion that you see in your

everyday activities

Rubric for Project

Newtons Laws Clips 60 points total Video Clip

10 points Description 5 points Does it fit

law? 5 points Presentation 15 points Did all

participate 15 points Creativity 10 points

Wednesday, November 10

Objective What are you learning today?

- Students will be able to demonstrate the

everyday occurrences of Newtons 3 laws - Video Project
- You must have 3 video clips by the end of the

class period!!

Warm Up

- Answer the following
- Describe your interaction with one of Newtons 3

laws in the last couple of days

- Find a partner
- Look at your drawings of the 3 laws from Monday

Things to do

Monday, November 1

Objective What are you learning today?

- Students will be able to Review the basics of

the principles of Motion - Look at questions from Chemistry Test
- Notes on Motion

Warm Up

- Answer the following (Start a new section)
- What evidence do you use to tell if you are in

motion or not?

- Glue the notes into your spiral

Things to do