Sliding / Acceleratinga = 2.55 m/s²v = 0.00 m/s
t = 0.00 s
Velocity vs. Time (v–t)[m/s]
Mass (m)5.0 kg
Applied Horizontal Force (F_app)+25.0 N
Static Friction (μs)0.40
Kinetic Friction (μk)0.25
Gravity (g)9.81 m/s²
Force & Motion Measurements
Applied Force (F_app)25.0 N
Friction Force (f)12.3 N
Normal Force (N)49.1 N
Weight (W = mg)49.1 N
Net Force (F_net = F_app + f)12.7 N
Acceleration (a)2.55 m/s²
Velocity (v)0.00 m/s
Newton's Second Law & Friction Model
F_net = m · a ⇒ a = F_net / m
2.55 m/s² = (12.7 N) / (5.0 kg)
Max Static Friction: f_s,max = μs · N
19.6 N = (0.40) · (49.1 N)
|F_app| (25.0 N) > f_s,max (19.6 N) ⇒ Block overcomes friction and slides!
Physics Conceptual Challenge
Question 1 of 4If the net external force acting on an object is zero, what must be true about its motion?
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