1. A 60 kg skydiver falls with constant velocity 50 m/s.
a. Draw a free-body diagram for the skydiver.
b. If there were no air resistance, what would be the skydiver’s acceleration as they fall?
c. Find the net force on the skydiver.
2. A 2kg box starts at rest, but is then pushed with a force of 20 N in the +x direction. The box has
an acceleration of 6 m/s/s.
a. Find the box’s velocity after 6 seconds.
b. Find the force of friction on the box.
c. Draw a free-body diagram of the box.
3. A student looks at a very heavy box and makes a claim, “The ground must push harder than the
force of gravity, otherwise it wouldn’t be able to hold the box up from sinking in the ground.”
Talk about what may be correct or incorrect about this claim, and then make a correct
statement.