newton's 3 laws notes
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Unbalanced Forces Notes #1
Newton’s 1st law! Objects in motion...
Mass resists acceleration
ExampleFull shopping cart vs. empty shopping cartThe greater the mass the more force it takes
to accelerate the object Acceleration is inversely proportional to
massAcceleration ~ 1
massAs the denominator increases the wholequantity decreases
Ten times as much
Newton’s Second Law The acceleration produced by the force
on an object is directly proportional to the magnitude of the net force, is in the same direction as the net force and is inversely proportional to the mass of the object
Mathematically: acceleration~ net force mass
Newton’s 2nd Law in Mullisen’s words... The harder you push, the faster it
accelerates – BUT – if it’s massive, it doesn’t accelerate as much.
Acceleration = How hard you push
How massive it is
acceleration = net force mass
Baby Hippo Physics You throw a baby hippo upward with a force of
1000 Newtons. The baby hippo’s mass is 500 kg
Acceleration ? = 1,000 newtons up
500 kilograms
Answer: 2 m/s/s
From the beginning of your throw to the end of your throw (which took 1 second), the baby hippo accelerated from 0 m/s to 2 m/s
Baby Hippo Physics
Now you strap the baby hippo to a rocket. The rocket burns for 12 seconds, and propels the baby hippo with a force of 3,000 Newtons.
Acceleration = 3,000 N
500 kg Answer: a = 6 m/s/s Every second the rocket burns, the baby
hippo goes 6 m/s faster. After 12 seconds, he’s going 72 m/s (161 mph)
Baby Hippo PhysicsNow you throw the baby hippo’s mom upward with a force of 1,000 Newtons. Her mass is 4,500 kg.
Acceleration ? = 1,000 newtons up
4,500 kilograms
Answer: a = .22 m/s/s
From the beginning of your throw to the end of your throw (which took 1 second), the mommy hippo accelerated from 0 m/s to .22 m/s
Newton’s 3rd Law of Motion For every action there is an equal and
opposite reaction. Examples:
You jump off a small boat.Oxygen tank in outer space. You sitting in your chair.JetLev Water Rocket Pack
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