under which condition is no work done?\n\na force pushes an object and slows it down.\na force pulls an…

under which condition is no work done?\n\na force pushes an object and slows it down.\na force pulls an object and speeds it up.\na force pulls down on an object that moves downward.\na force pushes up on an object that stays in place.

under which condition is no work done?\n\na force pushes an object and slows it down.\na force pulls an object and speeds it up.\na force pulls down on an object that moves downward.\na force pushes up on an object that stays in place.

Answer

Explanation:

Step1: Define the formula for work

$$W = F \cdot d \cdot \cos(\theta)$$

Step2: Identify the condition for zero work

Work is zero if force $F = 0$, displacement $d = 0$, or the angle $\theta = 90^{\circ}$.

Step3: Evaluate the given options

In the fourth option, the object "stays in place," meaning the displacement $d$ is zero.

Step4: Calculate work for the fourth option

$$W = F \cdot 0 \cdot \cos(\theta) = 0$$

Answer:

A force pushes up on an object that stays in place.