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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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warm up 9 17
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
Motion and Forces
  • All motion happens because there is a force.
  • Newton’s Laws describe the relationship between motion and force.
forces
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 1 st law of motion1
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 1 st law of motion2
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 1 st law of motion3
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 1 st law of motion4
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
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 weight1
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 1 st law video clip
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
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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