posted by James on .
A 1030 kg car is pulling a 360 kg trailer. Together, the car and trailer have an acceleration of 2.07 m/s2 directly forward.
How do you find net force on the car and trailer?
the car is pulling the trailer with a net force of F=masstrailer*a
The trailer is pulling back on the car with the same force.
You use Newton's second law,
F = M a
If you want the net force on car and trailer TOGETHER,
F = (1030 + 360)*2.07 N
Note that the weight does not appear. It is balanced by the upward force on the tires.