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Our ncert solutions for Solutions 12. Friction - Chapter Review | Class 8 Science - Toppers Study is the best material for English Medium students cbse board and other state boards students.

Solutions ⇒ Class 8th ⇒ Science ⇒ 12. Friction

# Solutions 12. Friction - Chapter Review | Class 8 Science - Toppers Study

Topper Study classes prepares ncert solutions on practical base problems and comes out with the best result that helps the students and teachers as well as tutors and so many ecademic coaching classes that they need in practical life. Our ncert solutions for Solutions 12. Friction - Chapter Review | Class 8 Science - Toppers Study is the best material for English Medium students cbse board and other state boards students.

## Solutions 12. Friction - Chapter Review | Class 8 Science - Toppers Study

##### Chapter review:

• Friction opposes the relative motion between two surfaces in contact. It acts on both the surfaces.
• The force of friction always opposes the applied force.
• Spring balance is a device used for measuring the force acting on an object.
• Friction can also produce heat. Vigorously rub your palms together for a few minutes.
• Friction depends on the nature of surfaces in contact.
• The substances which reduce friction are called lubricants.
• When one body rolls over the surface of another body, the resistance to its motion is called the rolling friction.
• When one body slides over the surface of another body, the resistance to its motion is called the sliding friction.
• Static friction comes into play when we try to move an object at rest.
• Rolling friction is smaller than the sliding friction.
• Sliding friction is smaller than static friction.
• The frictional force exerted by fluids is also called drag.
• Friction can be increased by making a surface rough.
• Friction can be reduced by using lubricants.