Conceptual Dynamics

Conceptual Dynamics - Independent Learning

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Friction - Conceptual Example 5.4-2

Consider a block that is begin pushed as shown in the figure.

If the block moves with constant velocity, which of the following are true?

Click all that apply.

F = F_f F > F_f F < F_f
N = mg N > mg N < mg

If the block is not moving what is the static friction force?

F_f = F sin(θ)
F_f = F cos(θ)
F_f = μ_sN

What condition must occur to set the block in motion?

F cos(θ) > μ_sN
F cos(θ) > μ_kN
F sin(θ) > μ_sN

If the block is accelerating across the floor, what is the friction force?

F_f = μ_kmg
F_f = μ_k(mg - F sin(θ))
F_f = μ_k(mg + F sin(θ))

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