newton’s laws of motion€¦ · notes_newton's_laws_fy13.notebook 1 march 05, 2013...
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Newton’s Laws of MotionSir Isaac Newton (16421727): English scientist who explained how force, motion, & acceleration interact.
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Newton’s First Law of MotionAn object at rest will remain at rest and an object in motion will continue moving at a constant velocity unless acted upon by a net force.
“Law of Inertia”
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Newton’s First Law of Motion
Inertia: tendency of an object to resist any change in its motion
> increases as mass increases
“Law of Inertia”
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Newton’s Second Law of MotionThe acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass.
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F: force (N)
m: mass (kg)
a: accel (m/s2)
1 N = 1 kg ∙m/s2
Newton’s Second Law of Motion
Fm
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A boy pushes a cart of groceries with a total mass of 40.0 kg. What is the acceleration of the cart if the net force on the cart is 60.0 N?
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A man exerts a 25N force which accelerates a boy in a grocery cart at 0.5 m/s2 . What is the mass of the boy AND the grocery cart?
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A car with a mass of 1200 kg accelerates at a rate of 3.0m/s2 in the forward direction. What is the net force acting on the car.
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What is the upward acceleration of a helicopter with a mass of 5,000 kg if a force of 10,000 N acts on it in an upward direction.
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Mr. Geraghty has a mass of 93.7 kg. What force does your science teacher exert on the floor of room 222 in pounds, and Newtons?
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PART ONE
Jacob has a mass of 78.4 kg. What force does he exert on the floor of the cafeteria in Newtons?
Good Afternoon: Please write your objectives from the board and complete the following problem:
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PART 2
Unfortunately, during lunch Jacob drank too much Sierra Mist and ate too many "Uncrustables", and without warning he needed an emergency restroom break. He accelerated as fast as he could into the rest breaking the laws of gravity. What was Jacob's acceleration from the cafeteria into the restroom?
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During a test crash, an air bag inflates to stop a TestDummie's forward motion. The Dummies's mass is 75 kg. If the net force on the Dummy is 825 N toward the rear of the car, what is the Dummie's deceleration?
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• Gravity
> force of attraction between any two objects in the universe
> increases as...
– mass increases
– distance decreases
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• Who experiences more gravity the astronaut or the politician?
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• Which exerts more gravity the Earth or the moon?
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