Friction
Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.
Factors Affecting Friction
SubtopicFactors Affecting Friction under Friction for Grade 8 CBSE.
Preview questions (no answers)
- 1.
What is the reason why writing with a pencil on paper is possible?
A.Due to gravity
B.Due to magnetic force
C.Due to friction between pencil lead and paper
D.Due to electrostatic force
- 2.
If a surface is made oily, the interlocking between the irregularities ____.
A.Increases
B.Decreases
C.Remains same
D.Becomes permanent
- 3.
The force of friction ____ motion between two surfaces in contact.
A.Supports
B.Opposes
C.Accelerates
D.Does not affect
Download the worksheet for Friction - Factors Affecting Friction to practice offline. It includes additional chapter-level practice questions.
Types of Friction: Static, Sliding, and Rolling
SubtopicTypes of Friction: Static, Sliding, and Rolling under Friction for Grade 8 CBSE.
Preview questions (no answers)
- 1.
Which of the following is correct regarding the magnitude of friction?
A.Static friction < Sliding friction
B.Static friction > Sliding friction
C.Rolling friction > Static friction
D.Sliding friction < Rolling friction
- 2.
The friction that acts between the brake pads and the wheel of a bicycle when you apply brakes is:
A.Static friction
B.Rolling friction
C.Sliding friction
D.Air friction
- 3.
Which of the following is true for a marble moving on a smooth glass floor?
A.Static friction is acting
B.Sliding friction is the main force
C.Rolling friction is acting
D.There is no friction at all
Download the worksheet for Friction - Types of Friction: Static, Sliding, and Rolling to practice offline. It includes additional chapter-level practice questions.
Friction: Advantages and Disadvantages
SubtopicFriction: Advantages and Disadvantages under Friction for Grade 8 CBSE.
Preview questions (no answers)
- 1.
Why do we use sandpaper to smooth a wooden surface?
A.Sandpaper has very low friction
B.Friction between sandpaper and wood wears away the rough spots
C.Sandpaper adds a layer of plastic to wood
D.Sandpaper makes the wood cold
- 2.
Which of the following is an advantage of friction while using a screwdriver?
A.It makes the handle hot
B.It wears out the screw head
C.It provides the grip to turn the screw
D.It makes the screwdriver heavy
- 3.
Why is it harder to push a heavy trunk across a carpet than across a smooth tiled floor?
A.Carpet is lighter than tiles
B.Carpet offers more friction
C.Tiles are magnetic
D.The trunk becomes heavier on the carpet
Download the worksheet for Friction - Friction: Advantages and Disadvantages to practice offline. It includes additional chapter-level practice questions.
Methods to Increase and Reduce Friction
SubtopicMethods to Increase and Reduce Friction under Friction for Grade 8 CBSE.
Preview questions (no answers)
- 1.
When an object rolls over the surface of another object, the resistance to its motion is called:
A.Sliding friction
B.Static friction
C.Rolling friction
D.Fluid friction
- 2.
Using a pencil to write on a glass sheet is difficult because glass is:
A.Transparent
B.Too smooth to provide enough friction for the lead to stick
C.Too hard for the pencil
D.A bad conductor of heat
- 3.
Which of these materials would you use to make a slide in a park so that children slide down easily?
A.Rough concrete
B.Polished plastic or metal
C.Rubber
D.Sandpaper
Download the worksheet for Friction - Methods to Increase and Reduce Friction to practice offline. It includes additional chapter-level practice questions.
Fluid Friction and Streamlining
SubtopicFluid Friction and Streamlining under Friction for Grade 8 CBSE.
Preview questions (no answers)
- 1.
Which of the following is the most effective way to minimize fluid friction for a fast-moving object?
A.Making the surface rough
B.Increasing the surface area
C.Streamlining the shape
D.Painting it a bright color
- 2.
Which property of a fluid determines how much drag it will exert?
A.Its thickness or nature
B.Its smell
C.Its chemical formula
D.Its transparency
- 3.
What happens to the fuel efficiency of a car if its streamlined design is damaged by a large, flat board placed on the roof?
A.Fuel efficiency increases
B.Fuel efficiency stays the same
C.Fuel efficiency decreases
D.The car consumes no fuel
Download the worksheet for Friction - Fluid Friction and Streamlining to practice offline. It includes additional chapter-level practice questions.