1.speed up
2.slow down
3. turn
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An object can accelerate by speeding up (increasing velocity) or by changing direction (experiencing a change in acceleration).
an object can accelerate both up and down
Due to a force acting on the object, such as gravity pulling an object downward. When the direction of the object's velocity changes, as in the case of circular motion. During collisions or interactions with other objects that transfer momentum to the object.
No, it is not harder to accelerate a moving object. The initial motion of the object does not affect the force required to accelerate it further. The force required to accelerate an object depends on its mass and the desired acceleration.
Objects can accelerate through forces like gravity, friction, and applied external forces. Acceleration can also occur from changes in an object's direction or speed.