what is a simple machine and i have a project where i have to build a toy that contains at lest three simple machinesand is cabable of completing a task with minimal or no human intervention details please

A simple machine is a pully, lever, wheel and axle, inclined plane. You could use a ramp and roll a marble down it. That's one simple machine. Then the marble can roll into a wheel and turn it which is another simple machine. Lastly, the wheel could push down a lever which could make something else happen, which is the third inclined plane.

i like the idea but what kin of wheel?

A simple machine is a device that helps make work easier by changing the direction or magnitude of a force. There are six types of simple machines: lever, wheel and axle, pulley, inclined plane, wedge, and screw. They can be combined to create more complex machines.

For your project, you need to build a toy that incorporates at least three simple machines and is capable of completing a task with minimal or no human intervention. Here's a breakdown of how you can achieve this:

1. Identify task: Start by selecting a specific task or action your toy will perform. For example, you could make a toy car that can climb up a small ramp, or a gripper that can pick up objects.

2. Choose simple machines: Based on your selected task, determine which three simple machines can be used to accomplish it. For instance:
- Lever: Use a seesaw-like mechanism to provide mechanical advantage.
- Wheel and axle: Incorporate wheels and axles to allow movement.
- Pulley: Integrate a pulley system to lift or move objects.

3. Design and build: Sketch out your design, incorporating the chosen simple machines. For each simple machine, consider how it will function and interact with others in your toy. Use materials such as wood, cardboard, or plastic to construct the toy. Make sure the components are securely attached.

4. Test and refine: Once you have built your toy, test it by performing the intended task. Observe its performance, noting any issues or areas for improvement. Refine and adjust the design as needed to optimize functionality and minimize human intervention.

5. Documentation: As part of your project, provide documentation such as illustrations, diagrams, or written explanations that detail the three simple machines used and how they contribute to the overall function of the toy. This will help explain the scientific principles behind your creation.

Remember to be creative and enjoy the process of designing and building your toy. If you encounter any challenges, don't hesitate to research or ask for assistance to further enhance your understanding of simple machines and their applications. Good luck with your project!