Work and Simple Machines

What is the purpose of a pulley?

• A pulley is used to change the direction of a force, making it easier to lift heavy objects.

• A pulley is used to store energy for later use.

• A pulley is used to measure the weight of an object.

• A pulley is used to create friction in a mechanical system.

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What is a wedge?

• A type of screw used for fastening objects together.

• A simple machine that is used to split or cut objects apart, consisting of two inclined planes.

• A lever that amplifies force to lift heavy objects.

• A wheel and axle mechanism used for transportation.

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What happens to energy when work is done on an object?

• Its energy is decreased, leading to a loss of motion.

• Its energy remains the same, with no change in position.

• Its energy is increased, often resulting in motion or change in position.

• Its energy is converted into heat, causing it to dissipate.

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What is a screw?

• A type of fastener that holds objects together by converting rotational force into linear motion.

• A tool used for cutting wood and metal.

• A device that measures the depth of water.

• A type of electrical connector.

How does a wheel and axle work?

• A wheel and axle is a simple machine that consists of a larger wheel attached to a smaller axle, allowing for easier movement of heavy loads.

• A wheel and axle is a complex machine that requires multiple gears to function effectively.

• A wheel and axle is primarily used for generating electricity in power plants.

• A wheel and axle is a type of lever that amplifies force by using a fulcrum.

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What is the role of friction in work and machines?

• Friction increases the speed of machines, making them more efficient.

• Friction has no effect on machines or work.

• Friction opposes motion and can reduce the efficiency of machines, making more work required to achieve the same result.

• Friction helps in reducing the wear and tear of machine parts.

What is mechanical advantage?

• The ratio of the output force produced by a machine to the input force applied to it.

• The measure of how much a machine increases the speed of an object.

• The total energy output of a machine compared to its energy input.

• The distance over which a force is applied in a machine.

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What is a lever?

• A simple machine that consists of a rigid bar that pivots around a fixed point called the fulcrum.

• A type of pulley used to lift heavy objects.

• A device that converts linear motion into rotational motion.

• A tool used for measuring angles and distances.

How does changing the direction of a force make work easier?

• It allows you to use gravity or other forces to assist in lifting or moving objects.

• It increases the amount of force applied to the object.

• It reduces the distance over which the force is applied.

• It makes the object lighter, requiring less force to move.

What is the relationship between force, distance, and work?

• Work is inversely proportional to force and distance.

• Work is directly proportional to both the force applied and the distance over which it is applied (Work = Force x Distance).

• Work is independent of force and distance.

• Work is equal to the sum of force and distance.