Simple Machines and Rube Goldberg Devices Test Review

Define what a Simple Machine is.

• A device that makes work easier by changing the direction or magnitude of a force.

• A machine that uses electricity to operate.

• A tool that only works underwater.

• A device that creates energy from nothing.

Answer explanation

A Simple Machine is defined as a device that makes work easier by changing the direction or magnitude of a force. This definition highlights its role in facilitating tasks, unlike the other options which are incorrect.

How do Simple Machines make work easier?

• By increasing the amount of work needed.

• By changing the direction or magnitude of a force.

• By making tasks more complicated.

• By using more energy.

Answer explanation

Simple machines make work easier by changing the direction or magnitude of a force, allowing us to apply less effort to accomplish tasks. This principle helps in lifting, pulling, or moving objects more efficiently.

Describe what a Rube Goldberg Device does.

• It performs a simple task in a very complicated way.

• It is used to generate electricity.

• It is a type of computer.

• It is a tool for measuring temperature.

Answer explanation

A Rube Goldberg Device is designed to perform a simple task through a series of complex and often humorous steps, making the process unnecessarily complicated. This aligns with the correct choice.

Which simple machine is defined as "something similar to a see-saw that can lift an object"?

• Pulley

• Lever

• Screw

• Wedge

Answer explanation

A lever is a simple machine that operates on the principle of a see-saw, allowing it to lift objects by applying force at one end while the load is at the other. This makes 'lever' the correct answer.

What is the main function of a wedge as a simple machine?

• To reduce friction

• To split an object apart

• To change the direction of a force

• To act as a ramp

Answer explanation

The main function of a wedge is to split an object apart. It does this by converting a force applied to its blunt end into a force that pushes outward on the sides, effectively separating materials.

Which simple machine is best described as "a ramp"?

• Pulley

• Lever

• Inclined plane

• Wheel and axle

Answer explanation

The inclined plane is best described as a ramp because it allows objects to be raised or lowered with less effort by providing a sloped surface, making it easier to move loads vertically.

A screw is a simple machine that can:

• Hold things together or lift an object

• Split an object apart

• Reduce friction

• Change the direction of a force

Answer explanation

A screw is designed to hold things together by creating a tight fit or to lift objects by converting rotational motion into linear motion, making the first option the correct choice.

Which simple machine uses a rope and can change the direction of a force?

• Pulley

• Wedge

• Wheel and axle

• Lever

Answer explanation

A pulley is a simple machine that uses a rope to lift objects and can change the direction of the applied force, making it easier to lift heavy loads. The other options do not fulfill this specific function.

What is the primary function of a wheel and axle as a simple machine?

• To act as a ramp

• To reduce the friction of moving something

• To split an object apart

• To hold things together

Answer explanation

The primary function of a wheel and axle is to reduce friction when moving objects. This allows for easier movement and transportation, making it an essential simple machine in various applications.

Which image best represents the use of a lever as a simple machine?

• I

• II

• III

• VI

Answer explanation

Image I best represents a lever as it shows a fulcrum with a load and effort applied, illustrating the principle of leverage. The other images do not depict this simple machine effectively.