# Science 3

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• Newtons 1st law- If an object is not pushed or pulled upon its velocity will naturally remain constant.
• Ex 2- A ball in the air will remain the same speed until the batter hits it or someone catches it.
• Ex 1- If a ball is rolling on the ground it will remain the same speed unless someone/something acts on it.
• Potential- The stored energy in an object.
• Kinetic and Potential Energy
• Ex 1- (Kinetic)A ground-ball has kinetic energy because its rolling which means it has energy. Ex 2- A pitchers arms has energy when she throws the ball because her arms have energy.
• Ex 1-(Potential) A bat that is about to hit a ball has potential energy because the bat hasn't swung for the ball yet. Ex 2- The pitchers ball in the glove has stored energy because it hasn't been thrown.
• Kinetic- Energy something gets when it is in motion.
• Ex 2-When you throw the ball to the first baseman the force goes in the 1st baseman's direction.
• Newtons 2nd law- If you place force on an object it will accelerate and it will change its velocity in the direction of the force.
• Ex 1-If you swing your bat to the left the ball is likely to go left, since that is where the force was directed.
• Newtons 3rd law- Every action has an equal and opposite reaction.
• Ex 1- When you hit a ball with the bat the bat exerts force onto the ball. The ball also exerts force onto the bat.
• Ex 2- When you throw a ball it exerts force into your hand just like you exert force into it.
• Net force- Two or more forces acting on an object.
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