Understanding Friction and Its Effects

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

Which type of friction occurs when the motion of two surfaces is caused by microwelds constantly breaking and forming?

• Air friction

• Sliding friction

• Rolling friction

• Fluid friction

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DOK Level 1: Recall

Explain how friction affects the motion of a car on a road.

• Friction increases the speed of the car.

• Friction decreases the speed of the car.

• Friction has no effect on the car's motion.

• Friction only affects the car when it is turning.

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DOK Level 2: Skill/Concept

Static friction prevents two surfaces from sliding past each other, this is due to _________ that have formed between the two surfaces.

• sludge

• microwelds

• animosity

• color

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DOK Level 1: Recall

A book is sliding across a table and comes to a stop. Which type of friction is primarily responsible for stopping the book?

• Static friction

• Sliding friction

• Rolling friction

• Fluid friction

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DOK Level 1: Recall

An unbalanced force occurs when the net force is greater than _________.

• Pi

• Zero

• Lollipop

• Vader

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DOK Level 2: Skill/Concept

Which type of friction is generally the strongest?

• Static friction

• Sliding friction

• Rolling friction

• Fluid friction

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DOK Level 1: Recall

Two people are pushing a box towards each other, neither persons force is greater than the other and the box doesn't move. This is an example of a ____________ force.

• upside down

• special

• balanced

• sideways

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DOK Level 2: Skill/Concept

How does the presence of lubricants affect friction between two surfaces?

• Increases friction

• Decreases friction

• Has no effect on friction

• Only affects friction in gases

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DOK Level 2: Skill/Concept

A car is driving on a wet road. Explain how the friction between the tires and the road can be affected if an emergency stop is needed.

• Friction increases, making it easier to stop.

• Friction decreases, making it harder to stop.

• Friction remains the same.

• Friction only affects the car's speed.

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DOK Level 3: Strategic Thinking