Chapter 5: Q. 12 (page 127)
Newton’s second law says . So is role="math" localid="1650733973680" a force? Explain.
Short Answer
No, But it is called the superposition force.
Chapter 5: Q. 12 (page 127)
Newton’s second law says . So is role="math" localid="1650733973680" a force? Explain.
No, But it is called the superposition force.
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Get started for freeTwo rubber bands cause an object to accelerate with acceleration
a. How many rubber bands are needed to cause an object with
half the mass to accelerate three times as quickly?
Problems 43 describe a situation. For each, draw a motion diagram, a force-identification diagram, and a free-body diagram.
A rocket is being launched straight up. Air resistance is not negligible.
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.
Problems 35 through 40 show a free-body diagram. For each:
a. Identify the direction of the acceleration vector 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.
An object experiencing a constant force accelerates at . What will the acceleration of this object be if
a. The force is doubled? Explain.
b. The mass is doubled?
c. The force is doubled and the mass is doubled?
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