newton’s 2nd law of motion - science with mr....
TRANSCRIPT
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Newton’s 2nd Law of Motion
Force & Acceleration
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Newton’s 1st Law
• An object in motion will stay in motion and an object at rest will stay at rest if the net force is…
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Newton’s 1st Law
• AKA the Law of Inertia
• Objects with lots of mass have lots of inertia. They resist motion.
• Therefore, an increase in mass results in a(n) decrease in acceleration.
• Acceleration and mass are said to be inversely proportional.
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Apply an equal Force to each…
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Force and Acceleration
The more force applied, the greater the acceleration. That is because force and acceleration are directly proportional.
Who will be able to
throw the soccer ball
further?
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Newton’s 2nd Law of Motion
The amount of force applied to an object is equal to its mass times its acceleration.
F = m * a
-F is force, measured in Newtons (N)
-m is mass, measured in kilograms (kg)
-a is acceleration, measured in meters per second per second (m/s/s)
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F = m*a
• The equation can be rearranged for acceleration:
– To calculate the acceleration an object undergoes…
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Newton’s 2nd Law
• The acceleration of an object is in the same direction as the applied force.
• Think free fall motion…
..the acceleration was in
the downward direction
because gravity was
pulling an object down.
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Example Math Problem
• A car has a mass of 1000 kg. What is the acceleration produced by a force of 2000 N?
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How much force?
• How much force, or thrust, must a 30,000 kg jet plane develop to achieve an acceleration of 1.5 m/s2?
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Free Body Diagram
• A diagram showing all the forces acting on an object.
• Force is a
vector
quantity.
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Force Problems
• Johnny has a mass of 100 kg. What is his acceleration if a force of 100 N is applied?
• Johnny is resisted by 50 N of friction. What is his acceleration?