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Force and Pressure
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Can you explain this picture?
On the moon my weight changes as there is less gravity
Why do astronauts float in space?
no gravity
Why do scuba tanks have high air pressure?
So people can breathe for longer under water.
Friction always acts in the _______ direction to that in which the object is moving.
opposite
A force of 16 N acts on an area of 50 cm^2. What is the magnitude of pressure in pascal?
3200 Pa
If a force of 20 N is applied and the distance between the hinge of the door and the point of application of force is 40 cm, then find the magnitude of moment of force.
8 Nm
Calculate the force if the area of cross-section is 20 cm^2 and the pressure exerted by the body is 12500 Pa.
25 N
How can pressure be reduced?
By increasing the surface area
Camels have large flat feet .Why?
Pressure
If you try to push a pin with pointed end,it will pierce through easily.Why?
smaller the area ,higher the pressure
why should food never be heated in a sealed can?
pressure of gas is increased as the gas molecules move about quickly in different directions -the heat gives the molecules more kinetic energy -there are more
what does pressure in a liquid increase with?
depth and density
what do vehicle brakes use?
Pressure
why does a sharp knife cut more easily than a blunt knife?
it has a smaller area of contact when it is used rather than a blunt knife so the pressure of the knife is much greater than the pressure of the blunt knife of
Do liquids and gases also exert pressure?
Yes
Does water pressure increase or decrease the deeper you go?
Increase
Will air pressure be high on top of the mountain or on the beach?
Beach
SI Unit of Pressure
Pascal
Pressure is defined as .....................over a given area.
Force


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