18 Questions
What is the term used for force per unit area?
Atmospheric pressure
Which force can act on an object with or without being in contact with it?
Non-contact force
What type of change in motion implies a change in the state of motion of an object?
Change in speed, direction, or both
What kind of force is exerted by air around us and is known as atmospheric pressure?
Contact force
Which force is responsible for exerting pressure on the walls of containers by liquids and gases?
Contact force
Which term describes a force that has both magnitude and direction?
Vector
What is the force that causes objects to fall towards the earth?
Gravity force
When two pieces of straw rubbed with paper are brought near each other, what force is observed between them?
Repulsion due to electrostatic charge
Why does water flow downward in rivers according to the text?
Due to the force of gravity
If a magnet is brought near another magnet placed on rollers, what will most likely happen?
Repulsion
What is the term used for a straw that has acquired electrostatic charge?
Charged straw
Why do objects fall towards the earth according to the text?
Due to gravity force
Why are we not crushed under the weight of the atmosphere?
The pressure inside our bodies is equal to the atmospheric pressure.
Why does a rubber sucker stick to a surface when pressed?
Due to a decrease in air pressure between the cup and the surface.
What did Otto von Guericke demonstrate with his air pump experiment involving metallic hemispheres?
The force of air pressure by showing that horses couldn't pull apart the hemispheres.
What would happen if there were no air between the rubber sucker and the surface?
The sucker would fall off immediately.
How did Otto von Guericke demonstrate the force of air pressure on metallic hemispheres?
By pumping air out and using horses to attempt to separate them.
What does the weight of air in a column of the height of the atmosphere represent?
The total mass of Earth's atmosphere above a given area.
Test your knowledge on forces and pressure in science. Explore concepts such as atmospheric pressure, contact force, electrostatic force, and friction.
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