Frictional force is important for motor racing. This is because, frictional force

Options

A. can help a car slow down
B. can help a car move faster
C. can help a car move around the corners without skidding
D. both (a) and (b)

Answer

### Step-by-Step Solution:

1. **Understanding the Role of Friction in Motor Racing**:
- Friction is a force that opposes the relative motion of two surfaces in contact. In motor racing, it plays a crucial role in the performance of the car.

2. **Analyzing the Options**:
- **Option 1**: Frictional force can help a car slow down.
- While this is true, it is not the primary focus in motor racing where high speeds are involved.
- **Option 2**: Frictional force can help a car move faster.
- This statement is misleading; friction does not directly cause a car to move faster but rather helps maintain control.
- **Option 3**: Frictional force can help a car move around the corners without skidding.
- This is a critical aspect in motor racing. When a car takes a turn, friction allows it to grip the road and navigate the curve without losing control.
- **Option 4**: Both A and B.
- This option is incorrect as it combines statements that do not accurately reflect the primary importance of friction in racing.

3. **Conclusion**:
- The most relevant and correct answer is **Option 3**: Frictional force can help a car move around the corners without skidding. This is essential for maintaining control and preventing accidents during high-speed racing.