please answer the all questions please please please please please please please please please please please
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1
Answer:
answer of question no 2 is
1- c
2- b
3- a
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5
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Que 1 - ans: fill ups
- 1 - gravity .
- 2 - thoracic cavity.
- 3 - friction.
Que 2 - ans: match the following :
- walking - normal force.
- upward push on a book by a table - Muscular force.
- finger prints provides us - force of friction.
Que 3 - and: 5 - define contact force -
- Contact force is the force that act between two objects that are physically touching each other.
6 - what is ment by muscular force?
- Muscular force is the force applied using parts of body like arms or legs .it results due to the action of the muscles , and is a contact force. since there is a contact between the surface.
7 - ans - In this example, the force acting on a book, is a gravitational force & normal force. are
equal & opposite giving a zero net force.
here, the velocity is Zero & remains unchanged.
Que 4 - ans
- 8 - ans: the force of resistance of the motion seems to be more on the rough surface than on the smooth surface.
- 9 - ans: there are two ways to reduce the air resistance are state : reducing the area in contact with air (by the cyclists ducking down or cycling behind some one else) & by being more streamlined (.wearing smoother surface or more streamlined helmet).
- 10 - ans : The balls motion will be faster along a flat surface at the bottom of the hill then it did along the flat surface at the top.
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