Which of the following will cause an object at rest to move?

To determine which forces will cause an object at rest to move, we must look for net forces that are not equal to zero. An object will remain at rest unless a net force is applied. The net force is found by summing all the forces acting on the object.

Let's analyze the given force pairs:

1. **<-20N, 19N>**
- Net Force = -20N + 19N = -1N (to the left)
- This will cause the object to move to the left.

2. **<5N, -15N>**
- Net Force = 5N + (-15N) = 5N - 15N = -10N (to the left)
- This will cause the object to move to the left.

3. **<-15N, 15N>**
- Net Force = -15N + 15N = 0N
- There is no net force, so the object will not move.

In summary, the first and second force pairs will cause the object at rest to move, while the third pair will not.

Pick one above

The force pair **<-20N, 19N>** will cause the object at rest to move, as it has a net force of -1N (to the left).