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10 Questions

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Year 8 Physics Chapter 8: Test 2

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Questions and Answers

What is the force that opposes motion between two surfaces that are in contact?

Magnetism

Gravity

Electromagnetism

Friction (correct)

What is the type of friction that occurs when an object is moving?

Kinetic friction (correct)

Fluid friction

Rolling friction

Static friction

What is the force of friction proportional to?

The surface area only

The normal force only

The normal force and the surface area (correct)

The velocity of the object

What is the purpose of lubricants in reducing friction?

To fill in the gaps between the surfaces Signup and view all the answers

What is the type of friction that occurs when an object is rolling?

Rolling friction Signup and view all the answers

What is the main advantage of reducing friction in machines?

To increase efficiency and reduce heat generated Signup and view all the answers

What is the direction of the force of friction?

Opposite to the direction of motion Signup and view all the answers

What is an example of static friction in everyday life?

A car's wheels gripping the road when it is stationary Signup and view all the answers

Why is rolling friction less than kinetic friction?

Because there is less surface area in contact Signup and view all the answers

What is the term for the force that helps prevent objects from moving when they are stationary?

Static friction Signup and view all the answers

Study Notes

Friction

Friction opposes motion between two surfaces in contact.
Kinetic friction acts when a surface is moving.
The force of friction is proportional to the normal force pressing the surfaces together.
Lubricants reduce friction by creating a thin layer between surfaces, reducing contact.
Rolling friction occurs when an object rolls across a surface.
Reducing friction in machines improves efficiency by minimizing energy loss.
The force of friction always acts in the opposite direction of the motion or potential motion.
An example of static friction in everyday life is a book resting on a table.
Rolling friction is less than kinetic friction because the contact area is smaller, and there's less resistance.
Static friction is the force preventing objects from moving when stationary.

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Description

Assess your understanding of physics concepts with this quiz covering topics from Chapter 8 of the Year 8 physics curriculum. Test your knowledge and identify areas for improvement.