Physical Science: Work and Machines

Front

What is the efficiency of a machine?

Back

Efficiency is the ratio of useful work output to the total work input, often expressed as a percentage.

Front

What is the formula to calculate efficiency?

Back

Efficiency (%) = (Useful Work Output / Total Work Input) x 100

Front

What is a simple machine?

Back

A simple machine is a device that changes the direction or magnitude of a force, making work easier.

Front

What are the six types of simple machines?

Back

Lever, Inclined Plane, Wedge, Screw, Pulley, Wheel and Axle.

Front

What is a lever?

Back

A lever is a rigid bar that pivots about a fixed point called the fulcrum.

Front

What is an inclined plane?

Back

An inclined plane is a flat surface that is tilted at an angle to help lift objects.

Front

What is a pulley?

Back

A pulley is a wheel on an axle designed to support movement and change the direction of force.

Front

What is a wedge?

Back

A wedge is a device that tapers to a thin edge, used to separate or hold objects apart.

Front

What is a wheel and axle?

Back

A wheel and axle is a simple machine consisting of a larger wheel attached to a smaller axle, allowing for easier movement.

Front

What is a resistance force?

Back

A resistance force is the force that opposes the motion of an object, such as friction or weight.