A Continuation of Newton's Second Law

        Today in class, we continued working with Newton's Second Law. We did a couple practice problems on the board, followed by questions 1-4 on page 140. We then attempted to learn about the effect that vectors have on these problems, but were sadly interrupted by the bell.

• Newton's second law states "An object accelerates in the direction of the force acting on it."
• The net force acting on an object can be calculated by multiplying the mass of an object by its acceleration.

Ex:
              A car has a mass of 2300kg. When starting forward from rest, the motor can exert a force of 4100 N, which pushes the car forward. How long does it take the car to get up to a speed of 35m/s?

M= 2300kg                   Fnet =MA                           A= 4100 N
Fnet = 4100 N               Fnet =A                                    2300kg
A=?                                 M
Vf = 35 m/s                                                              A = 1.783 m/s/s
Vi = 0
T = ?                               T= Vf-Vi            T =     35m/s              T = 20. s
                                                 A                      1.783m/s/s


Dylann is up next