Work, Power, and Energy Flashcardizz

Front

What is potential energy?

Back

Potential energy is the energy stored in an object due to its position or configuration. It is calculated as PE = mgh, where m is mass, g is the acceleration due to gravity, and h is height.

Front

How does lifting an object affect its potential energy?

Back

Lifting an object increases its height, which increases its potential energy. Specifically, if the height is doubled, the potential energy also doubles.

Front

What is the formula for calculating work?

Back

Work (W) is calculated using the formula W = Fd cos(θ), where F is the force applied, d is the distance moved, and θ is the angle between the force and the direction of motion.

Front

What is the relationship between work and energy?

Back

Work done on an object results in a change in its energy. If work is done on an object, its kinetic or potential energy increases.

Front

What is power in the context of work and energy?

Back

Power is the rate at which work is done or energy is transferred. It is calculated as Power (P) = Work (W) / Time (t). The unit of power is the Watt (W).

Front

How do you calculate the power required to lift an object?

Back

To calculate power when lifting an object, use the formula P = (mgh) / t, where m is mass, g is acceleration due to gravity, h is height, and t is time.

Front

What is the significance of the angle in the work formula?

Back

The angle θ in the work formula determines how much of the force contributes to the work done. If θ is 0 degrees, all the force contributes to work; if θ is 90 degrees, no work is done.

Front

What is kinetic energy?

Back

Kinetic energy is the energy of an object in motion, calculated using the formula KE = 1/2 mv², where m is mass and v is velocity.

Front

Can an object at rest have energy?

Back

Yes, an object at rest can have potential energy due to its position, such as an object held at a height.

Front

What is the work done when lifting an object at constant speed?

Back

When lifting an object at constant speed, the work done is equal to the weight of the object multiplied by the height lifted.