Question

While searching for your keys, you place your cup of coffee on the roof of your parked car. Unfortunately, you forget about the coffee and climb into the car without it. As you start driving the car forward, you hear the coffee hit the ground behind the car. Why didn't the coffee stay on the roof of the car?

Answer 1

here as per given situation

as car was moving forward with some speed and at beginning with some acceleration it starts now it must be like that the coffecient of friction between car roof and coffee cup was less than than the forward Force by car and so the cup of coffee fall down and as per inertia rule it falls down at back of car