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What is friction?

• A force that causes objects to accelerate.

• A force that is produced when two surfaces touch each other.

• A force that pushes objects upwards.

• A force that only acts on smooth surfaces.

In which direction does friction act relative to the object's movement?

• In the same direction.

• Perpendicular to the direction.

• Opposite to the direction.

• It does not have a specific direction.

Which of the following is a beneficial effect of friction?

• Worn shoe soles.

• Loud noise from drilling.

• Tire treads increasing grip on the ground.

• Rusted screws becoming difficult to loosen.

Which of the following is a negative effect of friction?

• An eraser removing pencil marks from paper.

• Bicycle brakes slowing down and stopping a bicycle.

• Sandpaper smoothing a rough wooden surface.

• Engine parts wearing out due to repeated friction.

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What are the two main factors that influence the amount of friction?

• Temperature and color of the object.

• Object's mass and type of surface.

• Air pressure and humidity.

• Object's speed and shape.