Answer:
1: C
2: C
3: A
4: Rolling Friction or Static Friction (See explanation)
Explanation:
It depends if the floor is slippery or its like tiles then rolling friction would be the answer however if the surface is rough its static friction.
1. Force is known as a push or pull or both. (Option C)
2. The unit of force in the metric system is called Newtons (Option C)
3. Forces occurs in pairs (Option A)
4. When you move a chair across the floor, your force must be stronger than the frictional force.
A force is known as a push or pull. It has magnitude and direction. Therefore, we can say a force is a vector quantity. Force unit is measured in Newton (N).
If we take a critical look into what force is all about, let's say we rub our two palms together. We will realize that force is exerted in the process as heat is being generated, as such, we can infer that forces occur in pairs.
Also, this is back by the Newton third law of motion which states that every action takes place with equal but an opposite reaction.
Mathematically;
Force = mass × acceleration.
A frictional force is a force that opposes the motion exerted by a person and its contact.
In the given question, if you're dragging a chair across the floor, your force must be stronger than the frictional force.
Therefore, from the given information, we have understood what is force and the appropriate answer to the questions.
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