Continuation of the "Newton's Third Law" Lab

We started today's class by reviewing questions regarding the “Newton’s Third Law” lab. We completed this lab by doing the Extension Experiments. We then proceeded to watch videos on inertia and Newton’s Third Law.  We finished off the class by doing a word problem on Newton’s Third Law, as shown below.

ex. Three toboggans are connected by a rope. The first toboggan has a mass of 75 kg, the second has a mass of 55 kg, and the third has a mass of 10.0 kg. If the force exerted on the first toboggan is 310 N and the surfaces are considered to be frictionless. Find:

a. the acceleration of the toboggans

         F_net   = 310 N [E]                                                                       
         m     = 10 kg + 55 kg + 75 kg = 140 kg
         a      = ?

b. the force exerted by toboggan two on toboggan three

F_net3=m₃a₃

F_net3= 10.0 kg (2.2 m/s² [E])

F_net3 = 22 N [E]

 

 Krystle Marie Anne Hanrahan is next.