Question

question 9 (4 points)
(02.06 hc)
a. create and describe a scenario in which the forces acting on an object are unbalanced. explain how you know the forces are unbalanced.
b. for your scenario, explain how newtons third law of motion describes the forces involved.

Explanation:

a. Consider a box on a rough floor being pushed with a force greater than the frictional force opposing its motion. The box starts to move. We know the forces are unbalanced because there is a net - force acting on the box (the difference between the applied force and the frictional force), causing a change in its state of motion (from rest to motion). According to Newton's first law, an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
b. In the box - pushing scenario, when the person pushes the box (action force), the box exerts an equal and opposite force on the person (reaction force) according to Newton's third law. Also, the box exerts a force on the floor due to its weight (action), and the floor exerts an equal and opposite normal force on the box. The frictional force is the force exerted by the floor on the box to oppose its motion, and the box also exerts an equal and opposite frictional - like force on the floor.

Answer:

a. A box on a rough floor is pushed with a force greater than the frictional force. The box moves, showing unbalanced forces as there is a net - force causing a change in motion.
b. When pushing the box, the person exerts a force on the box (action) and the box exerts an equal and opposite force on the person (reaction). Also, the box and floor exert equal and opposite normal and frictional - like forces on each other.