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Friction can make it easier to accelerate something or harder to. More friction on the object being accelerated means it is more difficult to accelerate it. You and a friend are pushing a heavy crate down a street from a standing start. It's difficult to accelerate it. Now try the same thing on a street that is covered with ice. (The two of you have spikes on your shoes.) Better acceleration.

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Q: How does friction affect acceleration?

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force, mass, friction, and gravity

If you are asking the rate of acceleration on a surface, than the larger the force of gravity is, the more it will affect the rate of acceleration. The amount of friction depends one many variables, one of which is gravity. The larger your force of gravity is, the larger the force of friction is. Because of this, the more the force of gravity is, than the slower the rate of acceleration is because of the larger force of friction, which would be acting against the rate of acceleration. Therefore, the force of gravity does affect the rate of acceleration.

Well, gravity is the pull of the earth. So, if a car accelerates, more friction is produced.

Change Near Earth, doubling the mass of an object will not affect how it gravitationally accelerates (ignoring air friction), but might affect how it accelerates across a pond of water (for the pond, the acceleration is probably not proportional to the mass).

Friction opposes motion. As long as you define the direction in which the object is moving to be positive, the acceleration due to friction will be negative. If you think about it, you start out with positive speed and friction decreases the speed, so adding friction subtracted from the speed. Note: Friction is counterintuitive when you start dealing with rolling without slipping. This answer doesn't address this.

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It reduces the acceleration of the falling object due to friction.

They affect the acceleration of bodies.

Friction provides a force, and therefore an acceleration, in the opposite direction of motion.

Friction usually reduces the net force and the resulting acceleration.

force, mass, friction, and gravity

If you are asking the rate of acceleration on a surface, than the larger the force of gravity is, the more it will affect the rate of acceleration. The amount of friction depends one many variables, one of which is gravity. The larger your force of gravity is, the larger the force of friction is. Because of this, the more the force of gravity is, than the slower the rate of acceleration is because of the larger force of friction, which would be acting against the rate of acceleration. Therefore, the force of gravity does affect the rate of acceleration.

If you are asking the rate of acceleration on a surface, than the larger the force of gravity is, the more it will affect the rate of acceleration. The amount of friction depends one many variables, one of which is gravity. The larger your force of gravity is, the larger the force of friction is. Because of this, the more the force of gravity is, than the slower the rate of acceleration is because of the larger force of friction, which would be acting against the rate of acceleration. Therefore, the force of gravity does affect the rate of acceleration.

Frictional force reduces aceleration, a= (F-friction)/m

Friction (including fluid resistance), gravity, electrical forces (which include combustion, muscle activity, and friction)

Air resistance causes friction and slows an object.

Air resistance causes friction and slows an object.

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