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Force and Motion

Force and Motion . 4 th Grade Amazing Earth February. What is a force?. A force is a push or pull. Forces can make things move, change their speed, or change their shape. Foot pushes the ball and the ball speeds away. The ball changes direction when the ground pushes against it.

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Force and Motion

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  1. Force and Motion 4th Grade Amazing Earth February

  2. What is a force? • A force is a push or pull. • Forces can make things move, change their speed, or change their shape. Foot pushes the ball and the ball speeds away The ball changes direction when the ground pushes against it Gravity pulls down while the wind pushes up Force pulls the bow back and the bow changes shape

  3. What is motion? • Motion is moving from one place to another. • Speed is the measure of motion. It measures how fast or slow something is moving.

  4. What is acceleration? • Acceleration is the force needed to make something go from standing still or moving slowly to moving very quickly. • Acceleration causes an increase or decrease in speed or a change in direction.

  5. Sir Isaac Newton • Sir Isaac Newton is considered one of the most important scientists in history. • Even Albert Einstein said that Isaac Newton was the smartest person that ever lived. • Newton developed : • the laws of motion • the theory of gravity • a new type of mathematics called calculus, and • the reflecting telescope 

  6. Let’s Talk about the Laws of Motion

  7. Laws of Motion • First Law: Nothing moves or changes direction unless a force acts on it. A sled will keep sliding unless a force stops it A ball won’t move until someone kicks it A rocket will sit on the launch pad until the engines fire

  8. Laws of Motion • Second Law: When a force pushes or pulls something, the object will move in the same direction as the force. A stroller moves in the direction it is pushed A ball will travel in the direction it is thrown

  9. Laws of Motion • Third Law: When a force acts in one direction, it creates an equal force in the opposite direction. A rocket pushes exhaust downward and the gas hitting the ground produces a force upward Gravity pulls down while air pushes up

  10. Force and Motion Activities As a group we will create:

  11. Balloon Rockets Which Law does this demonstrate? You and a partner, thread the string through the straw. Blow up the balloon. (That person always blows – no germs!) Pinch the end. 4) Hold the balloon under the straw. 5) Put two pieces of tape across the straw onto the balloon. 6) Hold the pinched end at the end of the string. 7) Each person holds one end of the string and stands far apart. 8) Let go of the balloon and watch it fly!

  12. Marshmallow Shooters Which Law does this demonstrate? Each students creates a launcher by folding the balloon in half longways. Cut about 1/4 off the top of the balloon. 5) Place a marshmallow inside the cup. *Inside the tie hole shoots best. 6) Pull back on the balloon to launch it! 3) Tie the balloon. 4) Stretch the balloon over the LIP of the cup (not the cut end).

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