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20 January, 21:41

A child drags a 0.398 kg toy dog

across flat ground at constant speed,

with a 4.63 N force at a 63.0° angle.

What is the force of friction on the

toy?

(Hint: You do NOT need to know the

coefficient of friction.)

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Answers (1)
  1. 20 January, 23:41
    0
    2.10 N

    Explanation:

    Draw a free body diagram of the toy. There are four forces:

    Weight force mg pulling down,

    Normal force N pushing up,

    Friction force F pushing left,

    Applied force 4.63 N pulling at an angle of 63.0°.

    Sum of the forces in the x direction:

    ∑F = ma

    4.63 N cos 63.0° - F = 0

    F = 2.10 N
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