# Newton’s 1 st Law of Motion. Isaac Newton  Scientist, mathematician, and philosopher  Established his three laws of motion in the late 1600’s.

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Newton’s 1 st Law of Motion

Isaac Newton  Scientist, mathematician, and philosopher  Established his three laws of motion in the late 1600’s

Newton’s 1 st Law of Motion An object in motion stays in motion and an object at rest stays at rest unless acted upon by a net force. Video clip

Inertia  Tendency of an object to resist change in motion  Measured by mass

Force is not needed for velocity to exist. Force is needed to change a velocity. Having a velocity is “FREE”, changing a velocity “costs” force. Think about examples in space, where there is no force of friction or gravity…

How are these examples of Newton’s 1 st law?  Shaking ketchup out of a bottle…  Riding on a skateboard and hitting a curb… You get the ketchup and bottle moving, then your hand applies a force that stops the bottle but no force pulls back on the ketchup so it keeps going. You and the skateboard are moving, the curb applies a force to stop the skateboard but none on you so you keep going forward.

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