Kinds of Friction

It is the force that opposes motion between two surfaces sticking or touching together.

• Rolling Friction

• Static Friction

• Fluid Friction

• Friction

It is the kind of friction that prevents an object from moving against a surface.

• Rolling Friction

• Fluid Friction

• Static Friction

• Sliding Friction

It is the resistance created by any two objects when sliding against each other.

• Sliding Friction

• Rolling Friction

• Fluid Friction

• Static Friction

It is a friction between moving objects and a liquid or between an object moving in the air.

• Static Friction

• Fluid Friction

• Rolling Friction

• Sliding Friction

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

Why do you need to apply more force to start moving an object from rest compared to keeping it moving?

• Static friction is generally higher than kinetic friction

• Kinetic friction is generally higher than static friction

• Objects gain energy when they start moving

• Objects are lighter when in motion

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DOK Level 2: Skill/Concept

Which of the following is NOT a type of friction?

• Static friction

• Kinetic friction

• Rolling friction

• Elastic friction

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DOK Level 1: Recall

Imagine you are designing a slide for a playground. To ensure children slide down smoothly, which type of friction would you try to minimize?

• Static friction

• Kinetic friction

• Rolling friction

• Both A and B

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DOK Level 2: Skill/Concept

Consider a scenario where a car is unable to stop at a stop sign during a rainy day. What friction-related concept could explain this situation?

• Increased static friction due to wet conditions

• Decreased kinetic friction due to wet conditions

• Unchanged rolling friction

• Increased air resistance

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DOK Level 3: Strategic Thinking

It is produced when an object rolls over a surface.

• Sliding Friction

• Static Friction

• Rolling Friction

• Fluid Friction