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# Newton’s 1 st Law of Motion - PowerPoint PPT Presentation

Newton’s 1 st Law of Motion . Warm Up: 9/17. Please get the warm up from the front lab table. and turn it in to the cubby when complete. You can use your notes and Distance-Time/Speed-Time Graphs from last week.

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### Newton’s 1st Law of Motion

• Please get the warm up from the front lab table.

and turn it in to the cubby when complete.

• You can use your notes and Distance-Time/Speed-Time Graphs from last week.

• You will have approximately 7 minutes to complete this before we start today’s lesson.

• All motion happens because there is a force.

• Newton’s Laws describe the relationship between motion and force.

• Forces are anything that make an object start moving or make an object slow down or stop.

• There are balanced and unbalanced forces.

• Unbalanced forces make an object start moving or they make an object speed up or slow down if it is already moving.

• Balanced forces mean that an object is at rest or that it has a constant speed.

Newton’s 1st Law of Motion

• If you slide your book across a carpeted floor, it will eventually stop.

• Any ideas why?

• What about if you slide a book across a surface like ice?

• FRICTION!!!!

Newton’s 1st Law of Motion

• Newton’s 1st Law of Motion states: “An object at rest will remain at rest and an object in motion will remain in motion unless acted on by an unbalanced force.

• Why do you think there are seatbelts in cars?

• http://teachertech.rice.edu/Participants/louviere/Newton/carandwall.gif

Newton’s 1st Law of Motion

• Inertia is the tendency of an object at rest to remain at rest or an object in motion to continue in motion.

• All objects resist changes in motion, so all objects have inertia.

• Newton’s 1st Law is also called the “Law of Inertia”

Newton’s 1st Law of Motion

• Mass is a measure of inertia.

• An object with a small mass has less inertia than an object with a large mass.

• Therefore, it is easier to move an object with a small mass.

• Ex. It is easy to hit a baseball with a bat and send it flying in the air, but it is hard to do the same with a bowling ball.

• All objects have mass.

• Mass is the amount of matter an object has.

• Weight is a measure of the gravitational force that is exerted on an object.

• Remember that on Earth gravity is different than in space or on other planets (related to Earth’s size)

• All objects feel a pull towards the center of the Earth which is why all objects fall downward at a rate of 9.8 m/s2 (constant rate that never changes!)

• Even though your weight might be different, your mass will still be the same (what you are made of does not change!)

• To calculate “true” weight, you must use the gravitational constant 9.8 m/s2 in the formula W=mg

• W=weight (Newton, N)

• M=Mass (Kilogram, kg)

• G=Gravity (Same as acceleration, m/s2 )

Newton’s 1st Law Video Clip