Force and Friction Grade 8 CBSE Science

What is the resultant force here? 20N to the left and 16N to the right.

• 36N

• 4N

• 20N

• 16N

This man is pushing against friction of 20N with a power of 10N. Will the box move?

• No

• Yes

Is it possible to reduce friction?

• No

• Yes

What are some ways to reduce friction? Check all that apply.

• Use Lubricants

• Polish rough surfaces

• Smoothen it

• Spread sand over the surface

• Use Ball bearings

Tin needs to go ice skating. She takes her skates and go outside. What is the science behind being able to ice skate?

• The skates are designed in a special way; this enables the skates to slide with reduced friction. The skates decrease friction.

• The ice rink is slippery, the skates help her get a grip. The skates increase friction.

Sportmen's shoes have spikes in them. What is a possible reason for this?

• The spikes help them in getting a grip.

• Spikes help them slide and run faster from their opponent.

Roller skates are an example for _______ friction.

• sliding

• rolling

• static

• pleasant

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