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Chapter 5: Q 5. (page 127)
An arrow has just been shot from a bow and is now traveling
horizontally. Air resistance is not negligible. Identify the forces on
the arrow.
two forces are there Drag and weight
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Figure shows the acceleration of objects of different mass that experience the same force. What is the magnitude of the force?
The leaf hopper, champion jumper of the insect world, can
jump straight up at 4 m/s2. The jump itself lasts a mere 1 ms before the insect is clear of the ground.
a. Draw a free-body diagram of this mighty leaper while the
jump is taking place.
b. While the jump is taking place, is the force of the ground on
the leaf hopper greater than, less than, or equal to the force of
gravity on the leaf hopper? Explain.
Redraw the two motion diagrams shown in the FIGURE , then draw a vector
beside each one to show the direction of the net force acting on the object.
Explain your reasoning.
Problems 35 through 40 show a free-body diagram. For each:
a. Identify the direction of the acceleration vector au and show it as a vector next to your diagram. Or, if appropriate, write
b. If possible, identify the direction of the velocity vector and show it as a labeled vector.
c. Write a short description of a real object for which this is the
correct free-body diagram. Use Examples 5.4, 5.5, and 5.6 as
models of what a description should be like.
FIGURE EX5.14 shows the acceleration of objects of different mass that experience the same force. What is the magnitude of the force?
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