Work, Energy, Power, and Forces Practice Flashcards

Fill-in-the-blank practice flashcards derived from lecture notes covering work, energy, work-energy theorem, power, potential energy types, and conservative vs non-conservative forces.

Work is said to be done by an applied force when it produces __________.

displacement

The small amount of work done $dW$ by a force $F$ for a small displacement $d\mathbf{r}$ is given by $dW = \mathbf{F} \cdot d\mathbf{r}$, and its unit is the __________.

Joule

The Work-Energy Theorem states that work done is equal to the change in __________.

kinetic energy

Using the kinematic relation $v^2 = u^2 + 2aS$, the work done $W = F S = m a S$ simplifies to $W =$ __________.

$$\frac{1}{2}m v^2 - \frac{1}{2}m u^2$$

The formula relating kinetic energy ($K.E.$) and linear momentum ($p$) for a body of mass $m$ is $K.E. =$ __________.

$$\frac{p^2}{2m}$$

Linear momentum $p$ expressed in terms of mass $m$ and kinetic energy ($K.E.$) is $p =$ __________.

$$\sqrt{2m (K.E.)}$$

Power is defined as the rate of work done or __________ delivered.

energy

One horsepower ($1\,hp$) is equal to __________.

$$746\,W$$

The expression for power $P$ in terms of force $\mathbf{F}$ and velocity $\mathbf{v}$ is $P =$ __________.

$$\mathbf{F} \cdot \mathbf{v}$$

The formula for gravitational potential energy $U$ with mass $m$, acceleration due to gravity $g$, and height $h$ is $U =$ __________.

$$m g h$$

The elastic potential energy $U$ stored in a spring with spring constant $k$ and displacement $x$ is $U =$ __________.

$$\frac{1}{2} k x^2$$

For a conservative force, the work done is __________ of the path.

independent

The total work done by a conservative force in a round trip is __________.

zero

Examples of conservative forces mentioned in the notes include gravitational force, elastic force, and __________ force.

Magnetic

For a non-conservative force, energy is dissipated as __________ on the surface.

heat

Two examples of non-conservative forces are frictional force and __________ force.

viscous