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Q 1.
Name the force behind the fallen of fruits from trees?
Ans.
Gravitational force.
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Q 2.
What is the net force applied on a object, when two force acts on opposite directions?
Ans.
Difference between the two forces.
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Q 3.
What changes occur on the object when force applied?
Ans.
It's speed, motion and shape all are changed.
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Q 4.
Name the force exerted by our muscles is called?
Ans.
Muscular force.
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Q 5.
What is the another name of muscular force?
Ans.
Contact force.
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Q 6.
Name the force exerted by the earth to pull the object towards itself is called?
Ans.
Gravitational force.
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Q 7.
Why the two objects repels each other?
Ans.
Either a magnetic or an electrostatic force.
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Q 8.
The force applied by an archer to stretch the bow is?
Ans.
Muscular force.
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Q 9.
What is the reason behind for rise of liquid medicine in a dropper?
Ans.
Atmospheric pressure.
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Q 10.
A nail is fixed in a wall due to?
Ans.
Friction.
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Q 11.
What is the Force per unit area is called?
Ans.
Pressure.
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Q 12.
Examples of contact force?
Ans.
Muscular and Friction force.
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Q 13.
How the strength of a force is usually expressed by its?
Ans.
Magnitude.
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Q 14.
What do you mean by "a push or a pull" of an objects is called?
Ans.
Force.
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Q 15.
Name the frictional force exerted by fluids is called?
Ans.
Drag.
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Q 16.
What is the common name for Fluids?
Ans.
Gases and Liquids.
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Q 17.
To move a loaded trolley we have to apply?
Ans.
Push force.
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Q 18.
A charged body attracts an?
Ans.
Uncharged body.
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Q 19.
To draw water from a well we have to apply?
Ans.
Pull force at the rope.
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Q 20.
Which scientists invented a pump to extract air out of a vessel and demonstrated force of air pressure by employing eight horses on each hemisphere to pull them apart?
Ans.
Otto Von Guericke.
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