Warm-up What force: –makes the flag outside fly? –holds the paper to the board? –makes an apple fall down and not up? –makes a boat float? –makes a balloon stick to a wall after rubbing it? How are these forces similar and different? Some PUSH, while others PULL. wind magnetism gravity buoyancy static electricity PUSH PULL PULL PUSH PULL.

Newton’s Laws of Motion Ch. 2.1, 2.2, 2.3

Sir Isaac Newton Born in England, Died in 1727 Formulated the law of gravitation Invented calculus Stated laws of motion

Newton’s 1 st Law of Motion States that objects at rest will remain at rest and objects in motion will remain in motion at the same velocity, unless acted upon by a force. “Law of Inertia” The tendency of an object to remain in motion or at rest is called inertia.

Example of Newton’s 1 st Law A force is a push or pull that changes the motion of an object. Listen to the car example from your teacher. Watch the inertia example at the front counter.

Example of Newton’s 1 st Law What happens when you’re walking with a cup filled high with a drink and stop suddenly? According to the 1 st law, why does the drink do this? the drink spills out It has inertia and continues traveling the speed you are walking at. When you stop, it keeps going.

Newton’s Second Law of Motion States that the force needed to accelerate an object is determined by the mass of the object. force = mass x acceleration The more mass an object has, the more force is needed. The less mass an object has, the less force is needed.

Examples of Newton’s Second Law If you used the same amount of force to push these 2 cars, which one would move faster? Why? Toy Car = less mass At which time would the tan car move faster; if you pushed it by yourself or with 2 friends? Why? 2 Friends = more force

Newton’s 3 rd Law of Motion States that when one object exerts force on a second object, the second object exerts an equal force in the opposite direction. “Law of Action and Reaction”

Why is the frog jumping off a lily pad an example of the 3 rd law? What two directions is the frog moving as its “jumping”? Since it’s “the law of action and reaction”, what two directions is the lily pad moving? Up and Forward Down and Backward Example of Newton’s 3 rd Law

What is happening to the swimmer’s body as he pushes the water backwards?

Example of Newton’s 3 rd Law It which direction is the space shuttle going? upwards What is the force moving it? Rocket fuel fire In which direction is the rocket “fire” going? downwards

Wrap-up Write whether each frame is BEST demonstrating Newton’s 1 st, 2 nd, or 3 rd Law! 1 st Law 3 rd Law 1 st Law 2 nd Law 3 rd Law