The force required to slide an object is equal to . weight
normal force
friction
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The force required to slide an object is equal to; C: Friction

According to newtons first law of motion, an object will remain at rest or continue in constant motion except it is acted upon by an external force.

Now, when an object is acted upon by an external force it sets it in motion but in the case of sliding, what is required is a force of friction because the object will have some sort of force between the surface that it is acting upon.

Read more about Friction Force at; link

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