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1 August, 23:03

11. Which of the following forces is a contact force? *

A. Gravity

B. Friction

C. Magnetism

D. Electricity

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Answers (2)
  1. 1 August, 23:52
    0
    B

    Explanation:

    Gravity is an invisible force, and so is magnetism and electricity. Friction involves the rubbing of things together to create energy.
  2. 2 August, 00:01
    0
    B

    Explanation:

    Friction is the force that you feel whenever you try to drag an object across a surface. Like a box along the floor, or your hand across a counter-top. It requires two objects to be in direct contact with each other (don't worry about air friction AKA "drag").
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