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WorksheetsPhy Ch 9 Energy
Total questions: 15
Worksheet time: 8mins
Which of the following is a unit of work?
slug
dyne
newton
joule
In which case is work zero?
The force applied is constant.
Only balanced forces are applied to an object at rest.
The force applied is parallel to the distance the object is moving.
Potential energy is changing
Kinetic energy is changing.
An ideal spring
oscillates equal distances on each side of the equilibrium position.
has a small mass.
has a variable spring constant, k.
has small internal friction.
is made of metal.
The force it takes to stretch a spring
is a constant.
is in the opposite direction to the force exerted by the spring.
is directed toward the equilibrium position of the spring.
varies inversely with the displacement of the spring
The SI unit of power is the
watt.
joule.
newton.
kilowatt-hour.
All of the following statements about power are true except
Power is work per unit time.
P = Fv cos q
It takes more power to do work quickly than it takes to do work slowly.
Power has units of N/s.
How much will the kinetic energy of a school bus increase if its velocity is tripled?
It will be two times greater.
It will be three times greater.
It will be six times greater.
It will be nine times greater.
When potential energy of a system is zero and its total mechanical energy is nonzero, then
the system is stationary at its minimum height.
the system is in motion.
the system is at its greatest elastic extension.
the kinetic energy of the system is negative.
Work is maximum when the angle between the applied force and system displacement is 90°.
true
false
The rate of doing work is energy.
true
false
Work and energy have the same unit of measure.
true
false
It is possible to exert a large force on a system and yet do no work.
true
false
Power is a scalar quantity.
true
false
Lifting a box of twenty books and lifting each of the twenty books the same distance one at a time require the same amount of power.
true
false
A falling object may possess both potential and kinetic energy.
true
false
