Question

epth 1. What is a contact force? Give two examples. 2. Write two characteristics of magnetic force and gravitational force. 3. How much would you weigh on an imaginary planet that has no gravitational force? 4. Define atmospheric pressure. How does it vary with altitude? 6. Name the different effects that an applied force may have on a body. 6. Why are board-pins made sharp? 7 Define pressure and its SI unit.​

Answer 1

Answer:

1. A contact force is any force that requires contact to occur. ... Pushing a car up a hill or kicking a ball across a room are some of the everyday examples where contact forces are at work.
2. They never cross one another. They all have the same strength. Their density decreases (they spread out) when they move from an area of higher permeability to an area of lower permeability.
3. Weight is zero in the absence of gravity.
4. Air pressure is higher at lower altitudes. Air density is higher at lower altitudes. There is more space between air molecules at higher altitudes. There is less oxygen to breathe at the top of a high mountain than there is at sea level.
5. The ends of the nails and pins are made sharp in order to minimize the area which in turn increases the pressure.So when you hit the nail on its head , even a small force converts into a large pressure due to the small area of the tail and the nail is able to insert in the wall.
6. Pressure is the amount of force applied perpendicular to the surface of an object per unit area and the for it is p (or P). The SI unit for pressure is the pascal (Pa), equal to one newton per square metre (N/m2, or kg·m−1·s−2).

Answer 2

Answer:

1)ANSWER:

A contact force is any force that requires contact to occur. ... Pushing a car up a hill or kicking a ball across a room are some of the everyday examples where contact forces are at work.

2)ANSWER:

They never cross one another. They all have the same strength. Their density decreases (they spread out) when they move from an area of higher permeability to an area of lower permeability.

3)ANSWER:

Weight of the body will be zero if there is no gravitational force is acting on the body.

4)ANSWER:

Air pressure is higher at lower altitudes. Air density is higher at lower altitudes. There is more space between air molecules at higher altitudes. There is less oxygen to breathe at the top of a high mountain than there is at sea level.

5)ANSWER:

• Force can change the shape of an object.

• Force can change the direction of a moving body.

• Force can speed up a moving body.

• Force can stop a moving body.

• Force can move a stationary(at rest) object.

6)ANSWER:

The ends of the nails and pins are made sharp in order to minimize the area which in turn increases the pressure.So when you hit the nail on its head , even a small force converts into a large pressure due to the small area of the tail and the nail is able to insert in the wall.

7)ANSWER:

Pressure is the amount of force applied perpendicular to the surface of an object per unit area and the for it is p (or P). The SI unit for pressure is the pascal (Pa), equal to one newton per square metre (N/m2, or kg·m−1·s−2).

Explanation:

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