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Newton's Laws of Motion
Transcript of Newton's Laws of Motion
Simarleen Gulati Newton's Laws of Motion First Thing's First! Example #2 Newton's First Law: Test Question: Example #1 If you observe a textbook on a desk, it will not fall off of the desk until an outside force makes it fall; this is an object at rest. But, if you push it off of your desk, this object will be in motion because your hand (the outside force) acted upon it. The outside force that stops this textbook from continually falling is the ground. Force is a push or a pull in a SPECIFIC direction.
Inertia is the tendency of an object to maintain its state of rest or motion unless acted upon by an outside force.
Acceleration is an increase in speed or velocity.
Mass is the quantity of matter as determined from its weight or from Newton's second law of motion
Weight is the the amount or quantity of heaviness. Objects in motion tend to stay in motion unless acted upon by an outside force; objects at rest tend to stay at rest unless acted upon by an outside force. Newton's First Law When the car is going at a steady speed and it suddenly halts, your body thrusts forward. This is because your body stayed in motion even though the car was acted on by the brakes. The outside force that stops your body from staying in motion is the seat belt (keeping you from flying out of the windshield). Newton's First Law What is an example of an "outside force" that could act upon an object? A. Wind
B. Running water
D. All of the above Newton's Second Law: This law explains the relationship of an object's mass (m), its acceleration (a), and its applied force or net force (f).
F = ma
Force equals an object's mass times its acceleration. MATH PROBLEM: If a 3,000 pound truck is going at 60 km/hr on the highway, what is the amount of force that is being used? A. 180,000 N
B. 50 N
C. 3,060 N
D. 2,940 N Newton's Second Law Example #1 When you drop a ball from a waist-height to the ground, the mass and the force on the ball decide its acceleration. The mass that the ball has, the more acceleration it will have. The force is gravity. When you are in a place will less gravitational pull, the downward acceleration will be slower. Newton's Second Law Example #2 If you place an empty box on a desk and push it with very little force, there will be a very large amount of acceleration. This is because of the proportion of force from your hand to the box's really light mass. But, if you put a textbook in the box and then push it with the same amount of force, the acceleration will be much slower than the first time. This is because the mass had increased (while the force stayed the same) and this is why the acceleration decreased. Newton's
Third Law Newton's Third Law For every action, there is an equal and opposite reaction. Newton's Third Law Example #1 ANSWER:
D When a rocket takes off into the atmosphere, there is force going both ways. The rocket has enough force to push itself up, but the gravity is still pulling down on the rocket while it is going the opposite way. The equal reaction is the gravitational pull versus the upward force of the rocket. The opposite reaction is the gas/fire that is blazing downward, but is also the force that makes the rocket go upward. Newton's Third Law Example #2 When a fish accelerates through the water, there is also force going both ways. The fish is using enough force (with its fins) to get through the water, but the water is also using its force in the other direction. The equal reaction is the water's pull in one direction versus the fish's force in the other direction. The opposite reaction is the friction between the direction that the fish is going in against the direction that the water is going in. TEST QUESTION: What are the opposing forces when you shoot a basketball? A.Your muscles and air
B.Your brain and oxygen
C.Your hand and gravity
D.Your brain and gravity ANSWER: