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## PowerPoint Slideshow about ' Newton’s 1 st Law of Motion ' - ophira

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

Motion and Forces

- All motion happens because there is a force.
- Newton’s Laws describe the relationship between motion and force.

Forces

- 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.

Mass vs. Weight

- 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!)

Mass vs. Weight

- 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

- http://www.youtube.com/watch?v=tbpqRSip4to
- http://www.youtube.com/watch?v=7702nTbov9c&feature=related

Mass vs. Weight Practice

- Note: 1kg. =2.2 lbs
- To calculate your “true” weight, you would divide your weight in pounds by 2.2kg.
- 150 lbs/2.2 kg/lbs=68.18 kg
- Suppose you wanted to convert your weight from kg to pounds. You would simply multiply your weight by 2.2 kg.
- 75kg x 2.2= 165 pounds

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