Choose the correct option for each question. There is only one correct response for each question.
Why is it easier to pull a cart on a smooth ground as compared to on a ground covered with grass?

Options

A. Gravitational force is less on smooth ground.
B. The smooth ground offers less friction.
C. The cart weighs more on the grass
D. Ground with grass is softer

Answer

To solve the question of why it is easier to pull a cart on smooth ground compared to ground covered with grass, we can break it down into the following steps:

### Step-by-Step Solution:

1. **Understanding Friction**:
- Friction is a force that opposes the motion of an object. It occurs when two surfaces come into contact with each other.

2. **Surface Characteristics**:
- The smooth ground has fewer irregularities compared to the ground covered with grass. Irregularities on a surface can cause more friction due to interlocking between the surfaces.

3. **Friction on Smooth Surfaces**:
- On a smooth surface, the irregularities are minimal, leading to less interlocking between the cart's wheels and the ground. This results in lower friction.

4. **Friction on Grass Surfaces**:
- In contrast, the grass surface has more irregularities, which increases the interlocking between the cart's wheels and the ground. This leads to higher friction.

5. **Conclusion**:
- Since friction opposes the motion of the cart, it is easier to pull the cart on a smooth surface where friction is less, compared to a grass surface where friction is more.

### Final Answer:
It is easier to pull a cart on a smooth ground because there is less friction on smooth surfaces compared to the higher friction present on grass-covered ground.

---