Science Unit One Forces and Motion What does it take to make an object move? Anticipatory questions from CC .Get volunteer, push and pull person, door, studs try pushing an object and pulling

FORCE - A push or a pull that acts on an object Forces are needed to set objects into motion

Forces that can push or pull on objects Contact or Non-contact forces Gravity Friction Air Magnetic Forces

2 KINDS OF FORCES BALANCED FORCE UNBALANCED FORCE When all of the forces on an object cancel one another out UNBALANCED FORCE When a certain force is partially or not at all cancelled out by other forces

Have kids stand up

Balanced Forces Put book on desks. Can you think of other things in this room which are experiencing a balanced force?

Balanced Forces with a Balloon The inward push of the stretched rubber is balanced by the outward push of the air. Outside push of air Blow up balloon and show Inside push of air

Now let’s take a look at unbalanced forces! Remember… UNBALANCED FORCE When a certain force is partially or not at all cancelled out by other forces

Unbalanced Force

Example of unbalanced force on a balloon

Let’s explore Working with a partner, your job is to find ways to show the class an example of a balanced force and an unbalanced force. You may use each other and common objects found in the room. Remember to be respectful of each other and of the things in this room. You have 10 minutes to brainstorm.

Let’s Explore… Plate and tablecloth If______________________ then____________ Reason? Marble and cup If _____________________then_____________

INERTIA – the tendency of an object to resist a change in its state of motion If something is “not moving,” like a car, it wants to stay “not moving.” If a marble is rolling down the hall, it wants to keep rolling down the hall. What are some other examples of inertia? It’s very basic…don’t get confused.

NEWTON’S FIRST LAW OF MOTION An object at rest will remain at rest and an object in motion will remain in motion unless acted upon by an unbalanced force. This is also called the LAW OF INTERTIA. Do Experiment on Newton’s first law of motion: inertia-each stud gets handout

Show videos online of Newton’s First Law

Assignment Using your notes, complete the review sheet, Newton’s First Law

FRICTION – A force that opposes the motion of one object moving past another

GRAVITY – the name for the attractive force between the mass of Earth and the mass of objects on Earth Let’s talk about contact forces first. What is friction? Friction demonstration guided inquiry investigation

SPEED How fast an object’s position changes with time at any given moment Speed = d/t (distance divided by time)

VELOCITY The speed and direction of a moving object

ACCELERATION Change in velocity with respect to time DECELERATION When a force causes the speed of an object to decrease

We have learned all about forces and Newton’s First Law of Motion We have learned all about forces and Newton’s First Law of Motion! Now, let’s look at Newton’s Second Law of Motion…

FORCE is the push or pull that acts on an object. MASS is the matter that makes up an object. ACCELERATION is a change in velocity with respect to time. Try moving bookcase – hard – it’s resisting my force and hard to move. Table-less mass, easier to move. Have kids do experiment with film canister and rubber bands using scientific method pages.

Newton’s Second Law of Motion Force = Mass x Acceleration (F = m x a) The acceleration of an object depends on its mass and the size of the force applied to it.

Experiment time… Wood film canisters, etc.

Bill Nye video on Newton’s laws

Newton’s Third Law of Motion For every action there is an equal and opposite reaction.