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Physics Final Review

Terms in this set (17)

Work is done when
the displacement is not zero
In which of the following scenarios is work done?
A car decelerates while traveling on a flat stretch of road
A horizontal force of 200 N is applied to move a 55 kg television set across a 10 m level surface. What is the work done by the 200 N force on the television set?
2000 J
Which of the following energy forms is associated with an object in motion?
Kinetic Energy
Which of the following energy forms is not involved in hitting a tennis ball?
Chemical potential energy
Ball A has triple the mass and speed of ball B. What is the ratio of the kinetic energy of ball A to ball B.
27
What is the kinetic energy of a .135 kg baseball thrown at 40.0 m/s?
108 J
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?
The kinetic energy decreases
Which of the following parameters does not depend on how resistant a spring is to being compressed or stretched?
Relaxed Length
What are the units for a spring constant, k?
N/m (newtons per meter)
If the displacement of a horizontal mass-spring system was doubled, the elastic potential energy in the system would change by a factor of
4
What is the gravitational energy of a 1.0 kg mass 1.0 m above the ground?
9.8 J
Friction converts kinetic energy to
Potential energy
Which of the following is the rate at which energy is transferred?
Power
What are the SI units for momentum?
kg m/s
Which of the following has the greatest momentum?
a tortoise with a mass of 275 kg moving at a velocity of 0.55 m/s
Which of the following has the greatest power output?
A crane that lifts a 2.5 X 10^4 N beam at a speed of 1.2 m/s
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