Write the answer of following questions
1.differentiate between balanced and unbalanced force with example.
2. write the effects of force with at least two examples of each of them
3. Define. :-
i) .1N
ii) .1 Pa
4.differentiate between contact and noncontact force with example
5.write the characteristics of liquid pressure.
6.write an activity to show the fluid pressure depends upon the shape of a moving body.
7.why mountaineers carry oxygen cylinder with them?
8.why aeroplanes have pressurized cabins?
9.why submarines are made up of thick layer of a steel?
10.In summer some people faces nose bleeding with them.why?
Answers
1.Balanced forces do not cause a change in motion. When balanced forces act on an object at rest, the object will not move. If you push against a wall, the wall pushes back with an equal but opposite force. ... Unbalanced forces are not equal and opposite.
2.A force can move a stationary object. Ex-The force of engine makes a stationery car to move.
A force can stop a moving object. Ex-The force of brakes can stop a moving car.
3.i) .1N
One newton is the force needed to accelerate one kilogram of mass at the rate of one metre per second squared in the direction of the applied force. The newton is named after Isaac Newton.
ii) .1 Pa
The pascal is the SI derived unit of pressure used to quantify internal pressure, stress, Young's modulus and ultimate tensile strength. The unit, named after Blaise Pascal, is defined as one newton per square metre. The unit of measurement called standard atmosphere is defined as 101325 Pa.
4.A non-contact force is a force which acts on an object without coming physically in contact with it. The most familiar example of a non-contact force is gravity, which confers weight. In contrast a contact force is a force applied to a body by another body that is in contact with it.
5.Liquid pressure increases with depth.
Liquid pressure remains the same in all directions at a given depth.
Liquid pressure depends upon the density of the liquid.
Liquid exerts pressure on the sides of the container.
A liquid seeks its own level.
6.Pressure within a liquid depends only on the density of the liquid, the acceleration due to gravity, and the depth within the liquid.Fluid pressure is a measurement of the force per unit area on a object in the fluid or on the surface of a closed container. This pressure can be caused by gravity, acceleration, or by forces outside a closed container. Since a fluid has no definite shape, its pressure applies in all directions.
7.Mountaineers carry an oxygen cylinder along with them. It is because when they climb mountains, as altitude increases, the amount of oxygen level in the atmospheric air decreases as trees are not found at higher altitudes. As a result, mountaineers suffer from dizziness. It can also lead to hypoxia.
8. Airplanes are pressurized because the air is very thin at the altitude they fly. ... To prevent all of these complications, the cabins of many aircraft are pressurized to near sea level pressure, which makes breathing in an airplane about the same as breathing at sea level.
9. Airplanes are pressurized because the air is very thin at the altitude they fly. ... To prevent all of these complications, the cabins of many aircraft are pressurized to near sea level pressure, which makes breathing in an airplane about the same as breathing at sea level.
10.But they are more common during summers. The hot and dry air during summers can rupture the tiny blood vessels in the nose. This results in nosebleeds and makes people panic.