Work & Power Flashcard

Front

What is work in physics?

Back

Work is defined as the transfer of energy that occurs when an object is moved over a distance by an external force. It is calculated as the product of the force and the distance moved in the direction of the force.

Front

What is the unit of work?

Back

The unit of work is the joule (J). One joule is defined as the amount of work done when a force of one newton moves an object one meter.

Front

What is power in physics?

Back

Power is the rate at which work is done or energy is transferred. It measures how quickly work is performed.

Front

What is the unit of power?

Back

The unit of power is the watt (W). One watt is equal to one joule per second.

Front

What is the equation for calculating power?

Back

Power = Work / Time

Front

If a force of 10N moves an object 5m, how much work is done?

Back

Work = Force x Distance = 10N x 5m = 50J

Front

What is the relationship between work and energy?

Back

Work is a means of transferring energy. When work is done on an object, energy is transferred to that object.

Front

If two people lift the same object to the same height, do they do the same amount of work?

Back

Yes, if the force applied and the distance moved are the same, the amount of work done is the same regardless of the time taken.

Front

What is the formula for calculating work?

Back

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

Front

What is kinetic energy?

Back

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