5.2. Newton’s Laws Explained http://www.ck12.org
a. Draw a free body diagram for the eraser.
b. What is the normal forceFNacting on the eraser?
c. What is the frictional forceFSequal to?
d. What is the maximum mass m the eraser could have and still not fall down?
e. What would happen if the wall and eraser were both frictionless?- A tractor of mass 580 kg accelerates up a 10◦incline from rest to a speed of 10 m/s in 4 s. For all of answers
below, provide a magnitude and a direction.
a. What net forceFnethas been applied to the tractor?
b. What is the normal force,FNon the tractor?
c. What is the force of gravityFgon the tractor?
d. What force has been applied to the tractor so that it moves uphill?
e. What is the source of this force?- A heavy box (mass 25 kg) is dragged along the floor by a kid at a 30◦angle to the horizontal with a force of
80 N (which is the maximum force the kid can apply).