Question

1. an 8.0 - newton wooden block slides across a horizontal wooden floor at constant velocity. what is the magnitude of the force of kinetic friction between the block and the floor? 2.4 n 8.0 n (2) 3.4 n (4) 27 n 9. which situation represents a person in equilibrium? (1) a child gaining speed while sliding down a slide (2) a woman accelerating upward in an elevator a man standing still on a bathroom scale (4) a teenager driving around a corner in his car 10.

Explanation:

Step1: Analyze the concept of equilibrium

Equilibrium means the net force acting on an object is zero. For a person, this implies no acceleration.

Step2: Evaluate each option

• Option (1): A child gaining speed while sliding down a slide has acceleration, so not in equilibrium.
• Option (2): A woman accelerating upward in an elevator has acceleration, so not in equilibrium.
• Option (3): A man standing still on a bathroom scale has no acceleration. The normal force from the scale equals his weight, net force is zero.
• Option (4): A teenager driving around a corner in his car is changing direction (centripetal acceleration), so not in equilibrium.

Answer:

(3) a man standing still on a bathroom scale