Why most forms of ground transportation use wheels, including bicycles, cars, 4-wheelers, roller skates, scooters, and skateboards?

Explanation

### Step-by-Step Text Solution:

1. **Understanding Friction**: Friction is a force that opposes motion when two surfaces come into contact. It can create resistance when trying to move an object.

2. **Types of Friction**: There are different types of friction, including static friction (when an object is not moving), kinetic friction (when an object is sliding), and rolling friction (when an object rolls over a surface).

3. **The Problem with Sliding Friction**: When vehicles move without wheels, they experience sliding friction, which is higher than rolling friction. This means that more force is needed to move the vehicle, making it less efficient.

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