Energy, Work, and Power – Fill-in-the-Blank Flashcards

30 fill-in-the-blank flashcards covering work, energy, and power concepts from the lecture notes.

For work to be done in physics, two conditions must be satisfied: a force must be applied and the body should move in the direction of the __.

applied force

Distance is the total length between two points, whereas displacement is the shortest distance from the initial position to the final position and has both magnitude and __.

direction

The SI unit of work is __.

joule (J)

1 kgfm = __ J.

9.8

The equation E = mc^2 shows energy and mass are __.

inter-convertible

Power is the rate of doing work, or the energy supplied in unit __.

time

The SI unit of power is __.

watt (W)

1 watt equals joules per second.

1

A machine does 300 J of work in 60 seconds; Power is __ W.

5

Kinetic energy of a body of mass m moving with speed v is given by KE = __.

1/2 mv^2

Gravitational potential energy is given by PE = __.

mgh

Elastic potential energy is the energy stored when work is done to deform, stretch or __.

compress

The value of acceleration due to gravity g is often taken as __ m/s^2 for easy calculations.

10

In a simple pendulum, at the extreme positions the bob possesses maximum __ energy.

potential

In a roller coaster, the energy at the bottom is mainly __ energy.

kinetic

According to the law of conservation of energy, the total mechanical energy is __.

constant

Work is zero if either the applied force or the __ is zero.

displacement

An artificial satellite does zero work while __ around Earth.

orbiting

Displacement has both magnitude and __.

direction

An example of work is when you push a __.

cart

W = F × s; s is the displacement in its own __ direction.

direction

The SI unit of energy is __.

joule (J)

The bigger unit of work is __.

kilojoule

1 kJ = __ J.

1000

The energy possessed by a body due to its position or motion is called __ energy.

mechanical

The energy possessed by a body by virtue of its motion is called __ energy.

kinetic

If the speed of a body is doubled, its kinetic energy becomes __ times its original value.

four

If the height is doubled, gravitational potential energy will __.

double

Kilowatt-hour (kWh) is the commercial unit of __.

electricity

One horsepower equals __ watts.

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