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Newton’s 2 nd Law of Motion: Student Learning Goal The student will be able to state Newton’s 2 nd Law and apply it in qualitative and quantitative terms to explain the effect of forces acting on objects. (B 3. 4)
nd 2 Newton’s Law of Motion and Acceleration
Newton’s Second Law of Motion If the net force is not zero, the object will be accelerated in the direction of the net force.
Newton’s Second Law Example: A weightlifter lifts a 165 -kg weight by exerting a force of 1. 8 k. N [up]. The force of gravity on the object is 1. 6 k. N [down]. Draw a FBD of the weight. What is the net force on the weight? What is the acceleration of the weight?
Newton’s Second Law Example 1. 8 k. N 1. 6 k. N
Newton’s Second Law Example 1. 8 k. N 1. 6 k. N The net force is 0. 2 k. N [up].
Newton’s Second Law Example What is the acceleration of the weight?
Newton’s Second Law Example What is the acceleration of the weight?
Newton’s Second Law Example What is the acceleration of the weight?
Newton’s Second Law Example What is the acceleration of the weight?
Newton’s Second Law Example What is the acceleration of the weight?
Example with the Equations of Motion A car is travelling at 25 m/s [forward] when the driver slams on the brakes and stops the car in 3. 0 s. Calculate (a) the acceleration of the car and (b) the net force needed to cause that acceleration if the mass of the car is 1200 kg.
Example with the Equations of Motion A car is travelling at 25 m/s [forwards] when the driver slams on the brakes and stops the car in 3. 0 s. Calculate (a) the acceleration of the car.
Example with the Equations of Motion A car is travelling at 25 m/s [forwards] when the driver slams on the brakes and stops the car in 3. 0 s. Calculate (a) the acceleration of the car.
Example with the Equations of Motion A car is travelling at 25 m/s [forwards] when the driver slams on the brakes and stops the car in 3. 0 s. Calculate (a) the acceleration of the car.
Example with the Equations of Motion A car is travelling at 25 m/s [forwards] when the driver slams on the brakes and stops the car in 3. 0 s. Calculate (a) the acceleration of the car.
Example with the Equations of Motion A car is travelling at 25 m/s [forwards] when the driver slams on the brakes and stops the car in 3. 0 s. Calculate (a) the acceleration of the car. or 8. 3 m/s 2 [backward]
Example with the Equations of Motion Calculate (b) the net force needed to cause that acceleration if the mass of the car is 1200 kg.
Example with the Equations of Motion Calculate (b) the net force needed to cause that acceleration if the mass of the car is 1200 kg. or 10 000 N [backward]
More Practice Newton’s 2 nd Law of Motion Lab
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