Static and Kinetic Friction

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An empty cart is being rolled across a warehouse floor. If the cart was filled, the force of kinetic friction between the cart and the floor would

Decrease

Increase

Remain the same

Slide 14

Application Analysis

Sand is often placed on an icy road because the sand:

Decreases the coefficient of friction between the tires of a car and the road

Increases the coefficient of friction between the tires of a car and the road

Decrease the gravitational force on a car

Increases the normal force of a car on the road