Unit 2 Extra
Either print this page and complete or
(better yet) neatly show your answers on a separate page of paper.
All answers must be expressed as complete sentences to receive
- Consider two identical cans, one filled with lead and the
other empty. The cans are located far in space at a place where
they are "weightless". Describe a method of determining which can
has the greater mass.
- Why is it more difficult to push a stalled car from a position
of rest than it is to keep it in motion once it is rolling?
- Consider hitting a baseball with a bat. If we call the force
of the bat against the ball the action force, identify the
- Each of the chain of bones forming your spine is separated
from its neighbors by disks of elastic tissue. What happens, then,
when you jump heavily on your feet from an elevated position? Can
you think of a reason why you are a little taller in the morning
than at night?
- An empty hand is not hurt when it bangs lightly against a
wall. Why is it hurt if it does so while carrying a heavy load?
- A strongman is standing between two identical freight cars of
equal mass. He pushes on both cars while his feet are off the
ground. Is it possible for him to set either of the cars in
greater motion than the other? Why or why not?
- Why can you exert greater force on the pedals of a bicycle if
you pull up on the handlebars?
- What is meant by "free fall"? Why doesn't a heavy object fall
faster than a lighter object when both are in a state of free
- In a tug-of-war, what is the net force acting on the rope when
the participants each pull with opposing forces of 500 N?
_________ What is the tensional force within the rope? ________
- In terms of inertia, what is the disadvantage of a lightweight
camera when snapping the shutter? Why is a massive tripod
preferred by most photographers?
- If we find a body that we know to be acted on by a force, but
that is not moving, what inference can we draw about its state of
- Do you find it easier to walk on a carpeted floor than one
having a polished smooth surface? Why?
- Suppose two carts, one twice as massive as the other, fly
apart when a compressed spring that is between them is released.
How fast does the heavier cart roll compared to the lighter cart?
- Two people of equal mass attempt a tug-of-war with a 12 meter
rope while standing on frictionless ice. When they pull on the
rope, they each slide toward each other. How do their
accelerations compare, and how far does each person slide before
- How does the weight of a falling body compare to the air
resistance it encounters just before it reaches terminal velocity?
___________ After?___________ Explain both answers.
Resources for physics students are available through
links on the
Physics Home Page. Such resources include the
Physics Studios (a collection of animations and movies which
illustrate key physics concepts) and
Physics Classroom (an online tutorial written in an
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