Newton’s Laws of Motion

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Presentation transcript:

Newton’s Laws of Motion Newton’s 2nd Law

Fnet = ma Newton’s 2nd Law “If a body is acted upon by an unbalanced force, it will accelerate.” Stated as a formula: Fnet = ma Note that the units for force are kgm/s2 or N

Ex. A 5.0 kg block is pushed to the right along a frictionless track with a force of 10.0 N. What is its acceleration?

Ex. A 650 kg car accelerates at 4. 0 m/s2 south Ex. A 650 kg car accelerates at 4.0 m/s2 south. What is the net force acting on it?

Since Fnet can be determined using acceleration then you will sometimes be required to use kinematics in solving force problems. Ex: A 1500 kg ice cream truck accelerates from rest to a top speed of 45 km/h in 8.0 s. What was the net force acting on the truck?

Finding Fnet To find Fnet when two forces work together simply add them. Ex. Stan and Kyle are pushing a 75 kg Cartman along a frictionless ice rink. Stan pushes with 55 N and Kyle pushes with 45 N. Find Cartman’s acceleration.

Fnet = Winners – Losers Finding Fnet To find Fnet when many forces act on an object: Fnet = Winners – Losers Ex. The Batmobile exerts a force of 8.50x103 N east, while friction pulls back on it with a force of 1500 N. If it has a mass of 1250 kg, what is its acceleration?