Work, Energy and Power flashcard

Front

What is the formula for calculating work done?

Back

Work (W) = Force (F) × Distance (d) × cos(θ), where θ is the angle between the force and the direction of motion.

Front

Define kinetic energy.

Back

Kinetic energy (KE) is the energy an object possesses due to its motion, calculated as KE = 1/2 mv², where m is mass and v is velocity.

Front

What is the unit of power in the International System of Units (SI)?

Back

The unit of power is the Watt (W), which is equivalent to one Joule per second (J/s).

Front

How do you calculate power when force and velocity are known?

Back

Power (P) = Force (F) × Velocity (v).

Front

What is gravitational potential energy?

Back

Gravitational potential energy (PE) is the energy an object possesses due to its height above the ground, calculated as PE = mgh, where m is mass, g is acceleration due to gravity, and h is height.

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 energy increases; if work is done by an object, its energy decreases.

Front

How do you calculate the change in kinetic energy?

Back

Change in kinetic energy (ΔKE) = KE_final - KE_initial.

Front

What is the formula for calculating the speed of an object just before it hits the ground when dropped from a height?

Back

Speed (v) = √(2gh), where g is the acceleration due to gravity and h is the height.

Front

What is the formula for calculating the work done when a force is applied at an angle?

Back

Work (W) = F × d × cos(θ), where θ is the angle between the force and the direction of motion.

Front

Define the concept of efficiency in the context of work and energy.

Back

Efficiency is the ratio of useful work output to total work input, often expressed as a percentage.