This is a basic physics situation. Gravity is a perpendicular force to the earth's surface, or a force that is directed to the earth's center. So when a car is on perfectly level ground it will not move. But when on a hill or any considerable incline it will roll (if the car is not hindered by you pushing on the brake or the car being in park.)
Think of your car as a marble on a level tabletop. Set down the marble and it will sit where you placed it. Now as you raise one end of the table it will roll.
So when your car is in motion it will act simular. When you travel downhill, gravity will push your car to a faster speed (if you don't push the brake.) But if you are on level ground, gravity will not push you to a faster speed. Thus saying it does no work for you, when you want to continue travelling forward.
However, if a car is freely rolling on a level road (with the engine off) it will stop because gravity works with friction to slow the car down. (Now try rolling your marble across your level tabletop slowly, it probably will stop before it falls off. That is friction and gravity hindering it to a stop.)
yes !
Gravity
yes or the ball would not move
The force of gravity on any object near the surface of the earth and close to sea level is 9.80 meters per second per second.
There CAN be, as long as the force is being counterd by an equal and opposite force.
If the track was perfectly level then there would have to be an external force applied.
Yes, because if you are 90 pounds on earth you would be 15 pounds on the moon. This is because weight is the force of gravity acting on an object, and the force of gravity depends on the mass of the object. The force of gravity on the earth is six times greater than that of the moon, or, the force of gravity on the moon is 1/6 that of the earth. On earth, a person's weight would vary slightly between sea level and the top of a mountain. This is because the force of gravity is stronger the closer an object is to the center of the earth (or moon, or planet).
Gravity does act on toothpaste because the force acts on any object on earth. Due to the high viscosity level of the paste, it takes long to flow.
on earth... as you get closer to the earths core the gravity becomes stronger.. therefore the bottom of the hill being closer to the core the gravity is stronger then the more distant top of the hill. as for the smooth road the gravity is pulling equally on all sides of the car so it cancels its self out and results in u not moving
If a glass marble is placed on a level surface, the only forces are gravity (which prevents the marble from floating off the surface), and the lack of lateral force (it is not pushed by hand), and friction as the surface is level. One could assume, that only in a vacuum jar, would the marble have zero force. But then, surely, the earth gravity must still have some effect?
The force of gravity (or any force) obey's Newton's Second Law of motion: the force applied to a body is equal to the time derivative of it's momentum. In cases where the mass is constant (practically all of introductory physics and much of graduate-level physics), force is equal to mass times acceleration. (F = ma)
You would weigh more at sea level. As you get father away from the surface of the earth, the force of gravity is weaker