Friction

Friction is a force that acts in an ___________ direction of movement.

• similar

• opposite

• parallel

• west

How can friction be reduced?

• reduce the force acting between the 2 surfaces

• reduce the roughness of the 2 surfaces coming in contact

• use wax, grease or oil

• all of the above are ways of reducing friction

Which of the following is an example of friction that is helpful?

• Brakes used on a bike

• Tires from a car on the road

• Tread on the bottom of your shoes

• All are examples that are helpful

Which of the following is an example of friction that is harmful?

• Pencil marking on paper

• Engine parts wearing out

• sand placed on ice in the winter

• Using an eraser to erase marks

What is the force that opposes the relative motion or tendency of such motion of two surfaces in contact?

• Gravity

• Friction

• Magnetism

• Tension

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DOK Level 1: Recall

Mason needs to push a heavy box across his room. What could he place under the box to reduce friction and make it easier to move?

• Sand

• Water

• A rug

• A plastic sheet

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DOK Level 3: Strategic Thinking

If you wanted to increase the friction between two sliding surfaces, what could you do?

• Make the surfaces smoother

• Lubricate the surfaces

• Make the surfaces rougher

• Cool the surfaces down

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DOK Level 2: Skill/Concept

Why is it more difficult to start moving a heavy object than to keep it moving?

• Static friction is greater than sliding friction.

• Sliding friction is greater than static friction.

• Rolling friction is greater than static friction.

• Fluid friction is greater than sliding friction.

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DOK Level 3: Strategic Thinking

Design an experiment to test how different materials affect the friction between two surfaces.

• Measure how long it takes for a block to slide down different fabric-covered inclines.

• Drop various objects from the same height and measure their speed.

• Compare temperatures of different materials after rubbing them together.

• Listen to the sound different materials make when they are scratched.

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DOK Level 4: Extended Thinking

Consider a scenario where you need to push a heavy box across a room. What could you place under the box to reduce friction and make it easier to move?

• Sand

• Water

• A rug

• A plastic sheet

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DOK Level 3: Strategic Thinking