Physics
Grade-9
Easy

Question

How does friction affect speed?

  1. More friction decreases speed
  2. More friction increases speed
  3. Less friction decreases speed
  4. Less friction does not affect speed.

hintHint:

Since friction always acts in the direction that is counter to the direction that an object is moving or attempting to move, it is a constant. A moving object is always slowed down by friction.

The correct answer is: More friction decreases speed


    More friction decreases the speed of a moving object.
    • Friction affects the speed of moving objects.
    • The speed of an object is more when it creates less friction with the surface.
    • More friction reduces the speed of the moving object.

    Friction is the force opposing one solid object's movement over another. Four categories of friction exist fluid friction, rolling friction, sliding friction, and static friction.
    ¶The frictional force keeps our feet planted on the ground when we walk on or on the floor. As a result, we frequently slip on icy or slippery surfaces because there is less friction.
    ¶According to scientists, friction is caused by the interactions of tiny bumps on surfaces as they rub against each other. The bumps on each surface bend and exert force on each other, making it difficult for the surfaces to slip over each other.

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