Wheels And Axles Quiz

Explanation
A pencil sharpener uses wheels and axles to rotate the blade and sharpen the pencil. The wheels and axles allow for easy rotation and movement, enabling the blade to effectively shave off the wood from the pencil and create a sharp point. The other options, such as a computer, pencil, and door, do not require the use of wheels and axles in their functioning.

Explanation
The first wheel was built around 3500 B.C. This is because archaeological evidence suggests that the wheel was invented in Mesopotamia during this time period. The wheel revolutionized transportation and played a crucial role in the development of civilizations. The invention of the wheel allowed for the creation of wheeled vehicles, which greatly improved the efficiency of transportation of goods and people. The wheel also had significant implications for agriculture, as it made it easier to plow fields and transport heavy loads. Overall, the invention of the wheel was a major technological advancement that had a profound impact on human history.

Explanation
A car is an object that we use in our daily life that uses wheels and axles. Cars are equipped with wheels that are attached to axles, allowing them to rotate and facilitate movement. The wheels and axles work together to support the weight of the car and enable it to roll smoothly on the ground.

Explanation
Windmills are an object that helps us generate electricity using the power of wind. They have large blades that rotate when the wind blows, and these blades are connected to a generator that converts the rotational energy into electrical energy. Additionally, windmills also use wheels and axles as part of their mechanism to enable the rotation of the blades. Therefore, windmills fit the criteria of helping us get electricity and using wheels and axles.

Explanation
A bicycle uses wheels and axles as its main components, allowing it to move efficiently. Additionally, riding a bicycle is a form of exercise as it requires physical exertion, especially when pedaling. Therefore, a bicycle fits the description of an object that uses wheels and axles while also helping us exercise.

Explanation
A wagon is used to carry objects and people around. It is a four-wheeled vehicle that is typically pulled by horses or other animals. Wagons have a large open space in the back where objects or people can be placed for transportation. They are commonly used for activities such as farming, hauling goods, or providing transportation for groups of people.

Explanation
Wheels and axles are a type of simple machine. They consist of a circular object (the wheel) that is attached to a rod (the axle). This simple machine allows for the efficient transfer of force and motion. Wheels and axles can be found in various objects and devices, such as cars, bicycles, and pulley systems. They are used to reduce friction and make it easier to move heavy loads or objects.

Explanation
A fan helps us keep cool by circulating air, and it uses wheels and axles to do so. The wheels and axles allow the fan blades to spin, creating airflow and providing a cooling effect.

Explanation
A wheel and axle consists of two parts: the wheel, which is a circular object that rotates around an axle, which is a cylindrical rod. The wheel and axle work together to transmit force and motion. Therefore, the correct answer is 2.

Explanation
A rolling pin is used to help flatten dough because it has wheels and axles. The wheels on the rolling pin allow it to roll smoothly over the dough, while the axles provide stability and control. This combination of wheels and axles makes the rolling pin an effective tool for flattening dough evenly and efficiently. The other options, such as a rotary dial telephone, windmill, and record player, do not have the specific design features necessary for flattening dough.