Mechanical Concepts

What is work?

• Work is the measure of time it takes to complete a task.

• Work is the distance an object can travel without any external force.

• Work is the amount of force exerted on an object.

• Work is the measure of energy transfer that occurs when an object is moved over a distance by an external force.

Define power and provide an example.

• Power is the speed of an object in motion

• Power is the force of gravity on an object

• Power is the rate at which work is done or energy is transferred. For example, a 100-watt light bulb converts electrical energy into light and heat.

• Power is the ability to lift heavy objects

Explain the concept of machines and how they make work easier.

• Machines are devices that use energy to perform work. They make work easier by multiplying the force applied, changing the direction of the force, or increasing the distance over which the force is applied.

• Machines are imaginary tools that don't actually exist

• Machines are living creatures that help with work

• Machines are magical devices that use spells to perform work

What is mechanical advantage and how is it calculated?

• It is calculated by dividing the output force by the input force.

• It is calculated by adding the output force to the input force.

• It is calculated by multiplying the output force by the input force.

• It is calculated by subtracting the output force from the input force.

Give an example of a machine with a mechanical advantage greater than 1.

• Lever

• Inclined plane

• Screw

• Pulley

Define efficiency in the context of machines.

• The measure of how fast a machine can operate.

• The measure of how loud a machine is.

• The measure of how heavy a machine is.

• The measure of how well a machine converts input energy into useful output energy.

How is efficiency calculated for a machine?

• Maximum theoretical output - Actual output

• Actual output / Maximum theoretical output * 100

• Actual output * Maximum theoretical output

• Actual output + Maximum theoretical output

Explain the relationship between work, power, and time.

• Work = Power x Time

• Work = Power - Time

• Work = Power / Time

• Work = Power + Time

What are the different types of simple machines?

• Spoon, fork, knife, spatula, ladle, whisk

• Car, bicycle, motorcycle, airplane, boat, train

• Lever, pulley, wheel and axle, inclined plane, wedge, and screw

• Hammer, drill, saw, chisel, wrench, pliers

Provide an example of how a simple machine can be used to increase mechanical advantage.

• Using a longer lever arm

• Using a shorter lever arm

• Using a rusty pulley

• Using a heavier load