12 Questions
What force makes a rolling ball stop on its own?
Friction force
What force might be responsible for the attraction between a rubbed balloon and a wall?
Electrostatic force
What is the name given to the force acting on a unit area of an object?
Pressure
What conclusion can be drawn from the observation of a fountain of water from a leaking joint in pipes?
Water exerts force on the bottom of the container.
What is the formula to calculate force when given pressure and area?
Force = pressure × area
What is the standard unit to measure atmospheric pressure?
mm of mercury
How do you calculate the area of a surface when given pressure and force?
Area = Pressure / Thrust
What conclusion can be drawn from observing water rushing out faster from a bottom hole in a bucket filled with water?
Pressure exerted by water increases with increasing depth
Explain how a wider strap on a backpack can help distribute the force more effectively. Use a physics equation to support your explanation.
A wider strap distributes the force throughout a greater surface area, reducing pressure. This can be calculated using the equation Pressure = Force/Area.
Define atmospheric pressure and explain its origin.
Atmospheric pressure is the force exerted by the weight of the air in the atmosphere on a surface. It originates from the weight of the air pushing down due to gravity.
How does the human body withstand the pressure exerted by the atmosphere, preventing it from being crushed?
The human body withstands atmospheric pressure as it is also pressurized internally. When diving to depths, gases in the body compress to balance the external pressure.
Discuss why atmospheric pressure decreases as altitude increases above the Earth's surface.
Atmospheric pressure decreases with altitude due to lower air density at higher altitudes. Gravity compresses air molecules more at lower altitudes, resulting in higher pressure.
Test your knowledge on pressure and force with this quiz. Questions include calculating force exerted on an area and the magnitude of atmospheric pressure. See if you can select the correct answers!
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