Simple Machines & Energy Test Review

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What is a simple machine?

Back

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

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What are the six types of simple machines?

Back

The six types of simple machines are lever, pulley, inclined plane, wedge, screw, and wheel and axle.

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What is mechanical advantage?

Back

Mechanical advantage is the ratio of the output force produced by a machine to the input force applied to it. It indicates how much a machine multiplies force.

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What is the formula for calculating work?

Back

Work (W) is calculated using the formula W = F × d, where F is the force applied and d is the distance moved in the direction of the force.

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What is energy?

Back

Energy is the ability to do work or cause change. It exists in various forms, including kinetic, potential, thermal, and chemical energy.

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What is the law of conservation of energy?

Back

The law of conservation of energy states that energy cannot be created or destroyed, only transformed from one form to another.

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What is efficiency in machines?

Back

Efficiency is the ratio of useful work output to total work input, expressed as a percentage. It indicates how well a machine converts input energy into useful work.

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What is kinetic energy?

Back

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

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What is potential energy?

Back

Potential energy is the stored energy of an object due to its position or state. For example, gravitational potential energy depends on an object's height.

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What is friction?

Back

Friction is the force that opposes the relative motion of two surfaces in contact. It converts kinetic energy into thermal energy, often resulting in heat.