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Physics Final

Terms in this set (59)

1. In which of the following sentences is work used in the scientific sense of the word?
c. Sam and Rachel pushed hard, but they could do no work on the car.
3. Work is done when
a. the displacement is not zero.
If the sign of work is negative,
b. the displacement is in the direction opposite the force.
7. In which of the following scenarios is no net work done?
b. A car travels at constant speed on a flat road.
Which of the following formulas would be used to directly calculate the kinetic energy of an object with mass
m bouncing up and down on a spring with spring constant k?
KE=1/2mv^2
If friction is the only force acting on an object during a given physical process, which of the following
assumptions can be made in regard to the object's kinetic energy?
a. The kinetic energy decreases.
Which form of energy is involved in weighing fruit on a spring scale?
d. elastic potential energy
Gravitational potential energy is always measured in relation to
d. a zero level.
What are the units for a spring constant?
d. N/m
If the mass in a horizontal mass-spring system was doubled, the elastic potential energy in the system would
change by a factor of
b. 1/2.
How much elastic potential energy is stored in a bungee cord with a spring constant of 10.0 N/m when the
cord is stretched 2.00 m?
b. 20.0 J
. For which of the following situations is the conservation of mechanical energy most likely to be a valid
assumption?
d. A soccer ball flies through the air.
Which of the following is the rate at which work is done?
d. power
Which of the following are not units of power?
W
How much power is required to lift a 2.0 kg mass at a speed of 2.0 m/s?
d. 39 J
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