Question

2 which of the following objects is in dynamic equilibrium? a. a car driving in a circle at a constant speed of 20 m/s b. a bicycle accelerating forward at 1.25 m/s² c. a motorcycle with a constant velocity d. a man standing in one place without moving

Explanation:

• Dynamic equilibrium means the object is in motion with no net force acting on it (so no acceleration).
• For option A: A car moving in a circle at constant speed has centripetal acceleration (direction of velocity is changing), so not in dynamic equilibrium.
• For option B: A bicycle accelerating has a non - zero acceleration, so net force is not zero, not in dynamic equilibrium.
• For option C: A motorcycle with constant velocity has zero acceleration. According to Newton's first law (\(F = ma\), \(a = 0\) implies \(F=0\)), it is in dynamic equilibrium.
• For option D: A man standing still is in static equilibrium (not in motion).

Answer:

C. A motorcycle with a constant velocity