Question

1. gravity:

a. none of the answers
b. has no effect on your car, since it will always weigh the same
c. is only important on mountain roads
d. has a constant effect on your car, its traction and its speed on hills

1. the best way to maximize the traction of your tires is to:

a. slightly overinflate them
b. inflate them to the recommended pressure
c. none of the answers
d. slightly underinflate them

Explanation:

1. Gravity is a fundamental force that constantly acts on objects on Earth. For a car, it affects traction (as it determines the normal force between the tires and the road) and speed on hills (pulling the car down - hill and making it harder to go up - hill). Option A is incorrect as gravity has an effect. Option B is wrong because although the car's weight is constant due to gravity, it does affect the car in multiple ways. Option C is incorrect as gravity is always present, not just on mountain roads.
2. Tires perform best and have maximum traction when inflated to the recommended pressure. Over - inflating can reduce the contact area with the road, decreasing traction. Under - inflating can cause the tires to overheat and also not provide optimal traction.

Answer:

1. D. Has a constant effect on your car, its' traction and it's speed on hills
2. B. Inflate them to the recommended pressure