Work , Power, Simple Machines Test Review

Front

What is work in physics?

Back

Work is defined as the transfer of energy that occurs when a force is applied over a distance. It is calculated using the formula: Work = Force x Distance.

Front

What is power in physics?

Back

Power is the rate at which work is done or energy is transferred. It is calculated using the formula: Power = Work / Time.

Front

What is a simple machine?

Back

A simple machine is a device that changes the direction or magnitude of a force. Examples include levers, pulleys, inclined planes, screws, and wedges.

Front

What are the three classes of levers?

Back

1st Class: Fulcrum between effort and load (e.g., seesaw). 2nd Class: Load between effort and fulcrum (e.g., wheelbarrow). 3rd Class: Effort between load and fulcrum (e.g., tweezers).

Front

How do you calculate work done?

Back

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

Front

What is the unit of work?

Back

The unit of work is the Joule (J), which is defined as the work done when a force of one newton displaces an object by one meter.

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

What is the formula for calculating power?

Back

Power = Work / Time, where work is in joules and time is in seconds, resulting in power measured in watts (W).

Front

What is a pulley?

Back

A pulley is a simple machine that consists of a wheel on an axle or shaft designed to support movement and change the direction of force.

Front

What is the difference between potential energy and kinetic energy?

Back

Potential energy is stored energy based on an object's position, while kinetic energy is the energy of an object in motion.