newton’s first and second laws of motion chapter 12 section 2
TRANSCRIPT
![Page 1: Newton’s First and Second Laws of Motion Chapter 12 Section 2](https://reader035.vdocuments.site/reader035/viewer/2022062715/56649d705503460f94a53519/html5/thumbnails/1.jpg)
Newton’s First and Second Laws of Motion
Chapter 12 Section 2
![Page 2: Newton’s First and Second Laws of Motion Chapter 12 Section 2](https://reader035.vdocuments.site/reader035/viewer/2022062715/56649d705503460f94a53519/html5/thumbnails/2.jpg)
Newton’s First LawAlso known as The Law of Inertia
O The state of motion of an object does not change as long as the net force acting on the object is zero.
![Page 3: Newton’s First and Second Laws of Motion Chapter 12 Section 2](https://reader035.vdocuments.site/reader035/viewer/2022062715/56649d705503460f94a53519/html5/thumbnails/3.jpg)
Newton’s 1st lawO An object in motion tends to stay in
motionO In a straight line at a constant speedO And an object at rest tends to stay
at restO Unless acted upon by an outside
force
O It requires a push or pull in order to change an objects state of motion!!!
![Page 4: Newton’s First and Second Laws of Motion Chapter 12 Section 2](https://reader035.vdocuments.site/reader035/viewer/2022062715/56649d705503460f94a53519/html5/thumbnails/4.jpg)
Newton’s 1st lawO Inertia is the tendency of an object to
resist a change in motion.
O ESA Video
![Page 5: Newton’s First and Second Laws of Motion Chapter 12 Section 2](https://reader035.vdocuments.site/reader035/viewer/2022062715/56649d705503460f94a53519/html5/thumbnails/5.jpg)
Newton’s 2nd LawO The acceleration of an object is
equal to the force you apply divided by the mass of the object.
![Page 6: Newton’s First and Second Laws of Motion Chapter 12 Section 2](https://reader035.vdocuments.site/reader035/viewer/2022062715/56649d705503460f94a53519/html5/thumbnails/6.jpg)
![Page 7: Newton’s First and Second Laws of Motion Chapter 12 Section 2](https://reader035.vdocuments.site/reader035/viewer/2022062715/56649d705503460f94a53519/html5/thumbnails/7.jpg)
Newton's Second Law
O If you apply more force to an object, it accelerates at a higher rate.
O Force is directly proportional to acceleration.
![Page 8: Newton’s First and Second Laws of Motion Chapter 12 Section 2](https://reader035.vdocuments.site/reader035/viewer/2022062715/56649d705503460f94a53519/html5/thumbnails/8.jpg)
Newton's Second Law
O If an object has more mass it accelerates at a lower rate because mass has inertia.
O The more mass the less acceleration; mass is indirectly proportional to acceleration.
![Page 9: Newton’s First and Second Laws of Motion Chapter 12 Section 2](https://reader035.vdocuments.site/reader035/viewer/2022062715/56649d705503460f94a53519/html5/thumbnails/9.jpg)
Newton’s 2nd LawO ESA video #2
![Page 10: Newton’s First and Second Laws of Motion Chapter 12 Section 2](https://reader035.vdocuments.site/reader035/viewer/2022062715/56649d705503460f94a53519/html5/thumbnails/10.jpg)
Newton's Second Law
![Page 11: Newton’s First and Second Laws of Motion Chapter 12 Section 2](https://reader035.vdocuments.site/reader035/viewer/2022062715/56649d705503460f94a53519/html5/thumbnails/11.jpg)
Newton’s 2nd Law• How much force is needed to accelerate a
1400 kilogram car 2 meters per second/per second?
• Write the formula• F = m x a• Fill in given numbers and units• F = 1400 kg x 2 meters per second/second• Solve for the unknown• 2800 kg-meters/second/second or
2800 N
![Page 12: Newton’s First and Second Laws of Motion Chapter 12 Section 2](https://reader035.vdocuments.site/reader035/viewer/2022062715/56649d705503460f94a53519/html5/thumbnails/12.jpg)
Practice Problems• 1. What acceleration will result when a 12
N net force applied to a 3 kg object? A 6 kg object?
• 2. A net force of 16 N causes a mass to
accelerate at a rate of 5 m/s2. Determine the mass.
• 3. How much force is needed to accelerate a 66 kg skier 1 m/sec/sec?
• 4. What is the force on a 1000 kg elevator that is falling freely at 9.8 m/sec/sec?
![Page 13: Newton’s First and Second Laws of Motion Chapter 12 Section 2](https://reader035.vdocuments.site/reader035/viewer/2022062715/56649d705503460f94a53519/html5/thumbnails/13.jpg)
Practice Problems-ANSWERS
• 1. What acceleration will result when a 12 N net force applied to a 3 kg object? A 6 kg object?• 4m/s 2; 2m/s 2
• 2. A net force of 16 N causes a mass to accelerate at a rate of 5 m/s2. Determine the mass.• 3.2 kg
• 3. How much force is needed to accelerate a 66 kg skier 1 m/sec/sec?• 66N
• 4. What is the force on a 1000 kg elevator that is falling freely at 9.8 m/sec/sec?• 9800N
![Page 14: Newton’s First and Second Laws of Motion Chapter 12 Section 2](https://reader035.vdocuments.site/reader035/viewer/2022062715/56649d705503460f94a53519/html5/thumbnails/14.jpg)
Now Try on your own!!!
![Page 15: Newton’s First and Second Laws of Motion Chapter 12 Section 2](https://reader035.vdocuments.site/reader035/viewer/2022062715/56649d705503460f94a53519/html5/thumbnails/15.jpg)
Review: O If mass stays the same, and you
INCREASE the force applied to an object, what happens to the acceleration of the object?
O If the force applied to an object stays the same, but the mass is increased, what happens to the acceleration?
![Page 16: Newton’s First and Second Laws of Motion Chapter 12 Section 2](https://reader035.vdocuments.site/reader035/viewer/2022062715/56649d705503460f94a53519/html5/thumbnails/16.jpg)
Mass Vs. Weight
O Mass is the amount of matter present in an object. Measured in Kg.
O Weight is the effect of gravity on an object’s mass. Measured in NewtonsO Gravity on Earth is 9.8 m/s2 or 9.8 N/Kg)
O Mass does NOT change.O Weight DOES change as gravity changes
![Page 17: Newton’s First and Second Laws of Motion Chapter 12 Section 2](https://reader035.vdocuments.site/reader035/viewer/2022062715/56649d705503460f94a53519/html5/thumbnails/17.jpg)
O Weight equals mass times the acceleration due to gravity.
O W = m x g
O Remember, gravity is different on other planets!