A tire has grip on it and so does a road so they can grip onto each other and the car can move. If there was no friction, then the cars wheels would spin, but the car woud not move as there is nothing for it to hold onto
ball will just move without rolling, staying in it's initial position but moving indefinitely (that is if it is given an initial force).
Say you are driving a car or riding a motorcycle and you just remove you foot or hand from the accelerator. What will happen? After some time depending on your velocity, the vehicle will stop. Why? Consider your entire vehicle an ideal system meaning that no part provides any sort of friction. Now consider road, road is rough and will definitely provide friction. Since your vehicle's tires are rolling against the road, the road will provide friction in the direction opposite to that of your vehicle's motion. In real situations, both tire and road will contribute to the rolling friction.
You would start sliding forever or trip in an instant and would not be able to stand up and walk properly without holding onto an object. Because friction is what keeps your feet remain still on the ground.
The cart will move at a constant velocity.
The cart will move at a constant velocity.
The ball will travel in a straight line path.
no
It would keep rolling.
ball will just move without rolling, staying in it's initial position but moving indefinitely (that is if it is given an initial force).
Say you are driving a car or riding a motorcycle and you just remove you foot or hand from the accelerator. What will happen? After some time depending on your velocity, the vehicle will stop. Why? Consider your entire vehicle an ideal system meaning that no part provides any sort of friction. Now consider road, road is rough and will definitely provide friction. Since your vehicle's tires are rolling against the road, the road will provide friction in the direction opposite to that of your vehicle's motion. In real situations, both tire and road will contribute to the rolling friction.
You would start sliding forever or trip in an instant and would not be able to stand up and walk properly without holding onto an object. Because friction is what keeps your feet remain still on the ground.
They would hit the ground at the same time.
If the bag is sliding across the countertop (i.e., the same surface of the bag is always in contact with the counter), then no. Rolling friction is only relevant when the surface of an object in contact with the surface it moves across always changes.
The cart will move at a constant velocity.
The cart will move at a constant velocity.
Kinetic energy is used to overcome friction and is dispersed as heat; some energy is converted to sound.
Sure. When I am running, I need to have good friction between my running shoes and the ground that I am running on, in order to be able to run quickly. A car needs a good level of friction between the tires and the road to drive at a high speed. Otherwise the wheels just spin but the car doesn't move (this can happen when you are stuck in the ice).
The ball will travel in a straight line path.