Matter — PHYSICS STD 6 — Question

What is parallax error ?

Answer the following in short.
How can sliding friction be changed into rolling friction easily?

Answer the following in short.
Define force. Write its SI unit.

Answer the following in a word or two or in a sentence.
Which force is responsible for supporting the weight of a book placed on a table?

How do high-rise building manage their pressure on the ground ?

Name the type of force which act in the following case:
A bicycle comes to rest slowly when the cyclist stops pedaling

Answer the following in a word or two or in a sentence.
Why is difficult for a pen to leave a mark on a highly smooth plastic sheet?

Write the correct statements :
In case of lever of third order, the effort arm is always longer than load arm.

Answer the following in a word or two or in a sentence.
Name the type of machine made by putting two inclined planes together.

Solve the crossword puzzle.
Across
1. Type of force which depends upon the roughness of a surface
2. An effect of friction
3. The force of friction caused due to fluids
4. Type of friction acting between two bodies at rest
5. Type of friction which occurs when applied force overcomes static friction
6. A special body design to enable minimum drage Down