Work and Energy Review

Front

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 can amplify force.

Front

What is the formula for work?

Back

Work = Force x Distance. It is measured in joules.

Front

How does a pulley help in lifting objects?

Back

A pulley changes the direction of the force applied, making it easier to lift heavy objects.

Front

What is the role of a ramp in reducing effort?

Back

A ramp allows a smaller force to be applied over a longer distance, making it easier to lift heavy objects to a height.

Front

What type of energy is transferred when touching a hot object?

Back

Thermal energy is transferred from the hot object to the cooler object (e.g., your hand).

Front

What is the difference between input force and output force?

Back

Input force is the force you apply to a machine, while output force is the force the machine exerts on the load.

Front

What is power in terms of work?

Back

Power is the rate at which work is done, calculated as Power = Work / Time.

Front

What is an example of a simple machine?

Back

Examples of simple machines include levers, pulleys, inclined planes, wedges, screws, and wheels.

Front

How does increasing the distance over which a force is applied affect work?

Back

Increasing the distance over which a force is applied can reduce the amount of force needed to do the same amount of work.

Front

What is kinetic energy?

Back

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