Unformatted text preview: 8 I. Interpreting force graphs
A. A box sliding on a rough surface feels both a normal force
and a frictional force from that surface. Consider the graph at
right of the magnitude of the frictional force vs. the
magnitude of the normal force.
1. What is the name of the slope of each line? 2. What do the three different lines represent? 3. What is the interpretation of the slope of each line (Hint: this is different from it’s name)? 4. What is the interpretation of the intercept of each line (the place where it crosses the vertical
axis)? Position II. Box of toys Starting at t = 0, a child pushes horizontally on a box, making it
slide across the floor. Friction exerted by the floor on the box
opposes its motion with a force of 100 newtons. The child pushes
with a force that changes, as this table shows.
Fchild on box 0 to 2 sec. 120 N 2 sec. to 4 sec. 2 90 N 6 t (sec) 4 6 t (sec) 4 6 t (sec) 100 N 4 sec. to 6 sec. 4 2 time interval 2 On the axes to the right, sketch the
box’s position, velocity, and
acceleration vs. time. Velocity Acceleration © University of Maryland Physics Education Research Group, Fall 2006. HW5-1 ...
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