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GravityGravity can do all three to an object, the best example of this would be tossing a ball straight up in the air: 1) It initially slows down to a halt at the highest point of ascent, 2) Then speeds up as it falls 3) And of course it changes directions at the top. FrictionFriction, however, is a different matter. Friction that deals with motion (dynamic friction) always acts in the opposite direction of motion; therefore, it cannot accelerate an object in the same direction as it is moving. Due to this, friction can only slow down an object. Can it reverse the direction of motion? Since it cannot speed up an object, it cannot make an object move after friction has slowed it down to a standstill like gravity can from the example above.

Thus, in conclusion: gravity can slow down, speed up an object and change its direction; however, friction can only slow down an object.

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13y ago
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3mo ago

Gravity can speed up an object as it falls and slow it down as it rises, but it does not change its direction. Friction can both slow down and speed up an object depending on the surfaces in contact, but it can also change the direction of an object by providing a force opposing its motion.

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Q: Can gravity and friction speed up and slow down and change the direction of an object?
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