Newton’s First Law of Motion Chapter 3 Section 2.

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Presentation transcript:

Newton’s First Law of Motion Chapter 3 Section 2

Newton’s First Law of Motion Sir Isaac Newton (1642 – 1727) was able to state rules describing the effect of forces on motion of objects that are still true today. These rules are known as: Newton’s Laws of Motion Newton’s First Law of Motion is also called The Law of Inertia

Newton’s First Law of Motion An object moving at a constant velocity keeps moving at that velocity unless a net force acts on it. If an object is at rest, it will stay at rest, unless a net force acts on it. If an object is in motion, it will stay in motion, unless a net force acts on it.

Newton’s First Law of Motion

What Happens in a Crash? Newton’s Law First Law of Motion If you are traveling at 50 kilometers per hour and you hit a tree…

What Happens in a Crash? If you are not wearing your seatbelt… The car is stopped by the tree and you continue to move forward at a speed of 50 kilometers per hour until you hit the dashboard, steering wheel, windshield, etc. You would hit at the same speed you would reach if you fell from a three-story building.

What Happens in a Crash? If you are wearing your seatbelt… The seatbelt loosens a little upon impact and will hold you. This allows your body to be slowed down gradually and decreases the unbalanced force placed on your body. The seatbelt could also save you from being thrown outside the car.