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 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 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 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 large box remains at rest on a sidewalk while a person pushes on it with a force to the right.
Which of the following choices shows the correct force diagram for this situation?
Responses
A man on the left side of a box on a sidewalk. Normal force vector (surface on box) points up; an equal gravitational force vector (Earth on box) points down. A long friction force vector (surface on box) points left; a shorter applied force vector (man on box) points right.
Modified by FlipSwitch.
vberla/Shutterstock
A man on the left side of a box on a sidewalk. Normal force vector (surface on box) points up from the ground; an equal gravitational force vector (Earth on box) points down onto the box. A friction force vector (surface on box) points right into the box; an equal applied force vector (man on box) points left into the box.
Modified by FlipSwitch.
vberla/Shutterstock
A man on the left side of a box on a sidewalk. Normal force vector (surface on box) points up; an equal gravitational force vector (Earth on box) points down. A short friction force vector (surface on box) points left; a longer applied force vector (man on box) points right.
Modified by FlipSwitch.
vberla/Shutterstock
A man on the left side of a box on a sidewalk. Normal force vector (surface on box) points up; an equal gravitational force vector (Earth on box) points down. A friction force vector (surface on box) points left; an equal applied force vector (man on box) points right.
A man on the left side of a box on a sidewalk. Normal force vector (surface on box) points up from the ground; an equal gravitational force vector (Earth on box) points down onto the box. A friction force vector (surface on box) points right into the box; an equal applied force vector (man on box) points left into the box.
The correct choice is:
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.