Question

20 the diagrams represent the only two forces acting on an object. which object could be moving to the right at constant speed?

Explanation:

Step1: Analyze the condition for constant - speed motion

An object moving at a constant speed has no acceleration. According to Newton's second law \(F = ma\) (where \(a=\frac{\Delta v}{\Delta t}\), and \(v\) is constant so \(a = 0\)), the net force \(F_{net}=0\).

Step2: Calculate the net force for each option

• Option A:

The two forces are in opposite directions. Using the formula \(F_{net}=F_1 - F_2\) (taking the right - hand direction as positive), \(F_{net}=1.0N-1.0N = 0N\).

• Option B:

The two forces are in the same direction. \(F_{net}=1.0N + 1.0N=2.0N\).

• Option C:

Taking the right - hand direction as positive, \(F_{net}=1.0N-2.0N=-1.0N\).

• Option D:

Taking the right - hand direction as positive, \(F_{net}=2.0N - 1.0N=1.0N\).

Answer:

A. Option Text