A 1kg block is placed near the top of an inclined plane that is at an angle of 30 degrees with respect
to the ground, as shown above. By correctly determining the effect of gravity, a student predicts that
the acceleration of the block will be 5m/s2. After allowing the block to slide down the inclined plane,
the student finds that the acceleration is actually 4m/s2. What type of force did the student most
likely not account for when predicting the acceleration of the block, and what is the magnitude of
that force? - force of friction of approx. 1 N
A 3kg object experiences a rightward horizontal acceleration of 6m/s2 as it slides to the right across a
rough, horizontal surface. The table above contains the label and magnitude of four forces exerted to
the right or left on the object that represent measurements from an experiment as the object
accelerates. Which pair of opposing forces in which directions could be responsible for the
acceleration of the object? - F3 to the right and F2 to the left
A block slides with constant velocity down a rough inclined plane that makes an angle of θ with the
horizontal. It experiences three forces: gravitational (Fg), normal (FN), and frictional (Ff). Which of
the following gives the magnitude of the net force on the block? - zero
A falling skydiver opens his parachute. A short time later, the weight of the skydiver-parachute
system and the drag force exerted on the system are equal in magnitude. Which of the following
statements predicts the motion of the skydiver at this time? - The skydiver is moving downward with
a constant speed
A hockey player uses a hockey stick to hit a puck such that the stick provides an applied force on the
puck. The puck travels for distance of 0.85m while experiencing the force from the stick. The puck
leaves the stick with a speed of 8.0m/s and travels at constant speed in a straight line along the
horizontal ice for a distance of 12m. The frictional force between the puck and the ice surface is
negligible.
How does the magnitude of the force exerted by the stick on the puck Fpuck,stick compare to the
magnitude of the force exerted by the puck on the stick Fstick,puck at the time interval in which the
stick is in contact with the puck? - Fpuck,stick = Fstick,puck
A hockey player uses a hockey stick to hit a puck such that the stick provides an applied force on the
puck. The puck travels for distance of 0.85m while experiencing the force from the stick. The puck
leaves the stick with a speed of 8.0m/s and travels at constant speed in a straight line along the
horizontal ice for a distance of 12m. The frictional force between the puck and the ice surface is
negligible.
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