Understanding Simple Machines

What is a simple machine?

• A simple machine is a complex device that requires electricity.

• A simple machine is a device that helps make work easier by changing the direction or magnitude of a force.

• A simple machine is a tool used for cooking.

• A simple machine is a type of computer.

Name the six types of simple machines.

• lever, wheel, axle, spring, wedge, ramp

• lever, wheel, axle, pulley, inclined plane, chain

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

• gear, lever, wheel, axle, pulley, block

How does a lever work?

• A lever functions by rotating around a central point without any force applied.

• A lever works by pushing down on one end to create friction.

• A lever is used to balance weights without any movement involved.

• A lever works by using a fulcrum to amplify force, allowing a small input force to lift a larger load.

What is the purpose of a pulley?

• To create friction for better grip.

• To store energy for later use.

• The purpose of a pulley is to lift heavy objects more easily.

• To measure weight accurately.

Can you give an example of an inclined plane?

• A flat surface.

• A ramp.

• A lever.

• A wheel.

What is the mechanical advantage of a wheel and axle?

• The mechanical advantage is the ratio of the radius of the wheel to the radius of the axle.

• The mechanical advantage is the weight of the wheel divided by the weight of the axle.

• The mechanical advantage is the difference between the radius of the wheel and the radius of the axle.

• The mechanical advantage is the sum of the diameters of the wheel and axle.

How does a screw function as a simple machine?

• A screw functions solely as a lever to lift objects.

• A screw only rotates without any linear movement.

• A screw is used to hold objects together without any motion.

• A screw converts rotational motion into linear motion, functioning as an inclined plane.

What is the difference between a fixed pulley and a movable pulley?

• A fixed pulley can lift heavier loads than a movable pulley.

• A movable pulley is always stationary and does not change the direction of force.

• Both pulleys are used to lift loads without any mechanical advantage.

• A fixed pulley is stationary and changes the direction of force, while a movable pulley moves with the load and reduces the effort needed to lift it.

How do simple machines make work easier?

• They make machines more complex.

• They increase the weight of objects.

• They eliminate the need for any force.

• Simple machines make work easier by reducing the amount of force needed to move objects.

What is an example of a wedge in everyday life?

• Hammer

• Screwdriver

• Saw

• Doorstop