Question

B. Fill in the blanks.
1.Friction always opposes the......
2. The force acting on a mango falling from a tree is an example of.......
3. Gravitational force is always........
in nature.
4. Magnetic force is a.......
force.
6. Rolling friction is........
5. The smoother a surface,.........
(greater/lesser) will be the friction.
than sliding friction.
7. The friction caused due to fluids such as water and air is known as......​

Answer 1

Answer:

1 Motion

2 Gravitational force

3 Attractive

4 Non contact force

5 lesser

6 less than sliding friction

7 fluid friction

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Answer 2

Answer:

1. Frictional force always acts always opposite to the direction of motion.
2. Gravitional force
3. Newton came up with universal law of gravitation which says gravity is always attractive and it's proportional to masses and inverse square of distance between them. It explained all motions on Earth, orbits of planets.
4. Magnetic force, attraction or repulsion that arises between electrically charged particles because of their motion. It is the basic force
5. Rolling resistance, sometimes called rolling friction or rolling drag, is the force resisting the motion when a body rolls on a surface. It is mainly caused by non-elastic effects; that is, not all the energy needed for deformation of the wheel, roadbed, etc., is recovered when the pressure is removed.
6. The Smoother a surface lesser will be the friction.
7. Viscosity is the internal resistance to fluid flow..

Explanation:

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