Question

5 multiple answer 1 point which one(s) of the following force diagrams depict an object moving to the right with constant speed? (multiple answers) a. b. c. d. c b d a

Explanation:

Step1: Analyze the vertical forces

For an object to move with constant speed (equilibrium), the vertical forces (up - down) must balance. In all diagrams (a, b, c, d), the upward force \(F_{up}=25N\) and the downward force \(F_{down} = 25N\). So, \(F_{up}-F_{down}=25N - 25N=0\) for all.

Step2: Analyze the horizontal forces

For equilibrium (constant speed), the horizontal forces (left - right) must balance.

• In diagram a: The left - ward force \(F_{left}=20N\) and the right - ward force \(F_{right}=20N\). So, \(F_{right}-F_{left}=20N - 20N = 0\)
• In diagram b: The left - ward force \(F_{left}=15N\) and the right - ward force \(F_{right}=20N\). So, \(F_{right}-F_{left}=20N - 15N=5N

eq0\)

• In diagram c: There are no horizontal forces. But if there is no horizontal force, and the object is already in motion (moving to the right), by Newton's first law (an object in motion will stay in motion with constant velocity if no net force acts on it), it can move with constant speed.
• In diagram d: There is a right - ward force \(F_{right}=20N\) and no left - ward force. So, \(F_{net}=20N

eq0\)

Answer:

a. Option a, c.