Final answer:
In physics, it is more difficult to stop a vehicle going downhill because of the force component due to gravity working against the opposing force of friction.
Step-by-step explanation:
In physics, it is more difficult to stop a vehicle going downhill because of the force component due to gravity working against the opposing force of friction.
When a vehicle is going downhill, the force due to gravity pulls the vehicle downward, increasing its speed.
Friction, which opposes motion, can help slow down the vehicle, but it is less than the force due to gravity when going downhill, making it more challenging to stop.
For example, imagine a car coasting downhill.
The force due to gravity helps accelerate the car, while friction tries to slow it down. If the force due to gravity is greater than the frictional force, the car will continue moving downhill and be harder to stop.