Two construction workers are attempting to pull a slab of concrete off of the ground. Each of the workers are pulling up with a force of 225 N, while the slab of concrete applies a gravitational force of 400 N in the opposite direction, remaining stationary.

Question

If the pulling forces applied to the slab of concrete are assigned a positive value, what is the net force of the scenario, and in which direction will the slab of concrete move?

(1 point)
Responses

-175 N; the slab will remain stationary
-175 N; the slab will remain stationary

175 N; the slab will move upward
175 N; the slab will move upward

-50 N; the slab will remain stationary
-50 N; the slab will remain stationary

50 N; the slab will move upward

Answer 1

To find the net force acting on the slab of concrete, we can analyze the forces involved:

1. The total pull force from the two workers is: $$225,\text{N}+225,\text{N}=450,\text{N}(\text{upward})$$

2. The gravitational force acting downward on the slab is: $$400,\text{N}(\text{downward})$$

3. The net force is calculated by subtracting the downward force from the total upward force: $$\text{Net Force}=\text{Upward Force}-\text{Downward Force}=450,\text{N}-400,\text{N}=50,\text{N}(\text{upward})$$

Since the net force is positive (50 N), the slab of concrete will move upward.

Therefore, the correct response is: 50 N; the slab will move upward.