Study the scenario.
An object is at rest. At five seconds, someone comes over and pushes the object forward with a force of 10 N. After it is pushed, the object is still at rest.
Which of the following choices describes how static equilibrium could have been achieved when the object was pushed?
Responses
A force greater than 10 N was exerted straight down on the object, countering the normal force.
A force greater than 10 N was exerted straight down on the object, countering the normal force.
A force greater than 10 N was exerted in a forward direction on the object at exactly five seconds so that the forces were balanced, and the object remained at rest.
A force greater than 10 N was exerted in a forward direction on the object at exactly five seconds so that the forces were balanced, and the object remained at rest.
A force of exactly 10 N was exerted straight down on the object, countering the normal force.
A force of exactly 10 N was exerted straight down on the object, countering the normal force.
A backward force of 10 N was exerted on the box at exactly five seconds so that the forces were balanced, and the object remained at rest.
A force greater than 10 N was exerted in a forward direction on the object at exactly five seconds so that the forces were balanced, and the object remained at rest.
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To determine which choice describes how static equilibrium could have been achieved when the object was pushed, let's analyze the scenario.
The object is initially at rest, and at five seconds, someone pushes it forward with a force of 10 N. However, the object remains at rest after being pushed. This means that the applied force of 10 N must have been balanced by an equal and opposite force.
Now let's consider the choices:
A) A force greater than 10 N was exerted straight down on the object, countering the normal force.
B) A force greater than 10 N was exerted in a forward direction on the object at exactly five seconds so that the forces were balanced, and the object remained at rest.
C) A force of exactly 10 N was exerted straight down on the object, countering the normal force.
D) A backward force of 10 N was exerted on the object at exactly five seconds so that the forces were balanced, and the object remained at rest.
Since the object is still at rest after being pushed, choices B and D seem more plausible as they suggest that a force of equal magnitude was exerted to balance the applied force of 10 N.
However, given the scenario, choice D is incorrect because the object was pushed forward, not backward. This leaves us with choice B, which states that a force greater than 10 N was exerted in a forward direction on the object at exactly five seconds, so that the forces were balanced and the object remained at rest. This is the most reasonable explanation for achieving static equilibrium.
Therefore, the correct choice is B) A force greater than 10 N was exerted in a forward direction on the object at exactly five seconds, so that the forces were balanced, and the object remained at rest.