To analyze the scenario, we need to look at the forces acting on the animal:
- The force propelling the animal forward: 5 N (forward).
- The frictional force opposing its forward motion: 4 N (backward).
- The gravitational force acting downward: 10 N (down).
- The force the animal exerts to push itself upward: 10 N (up).
Now, let's calculate the net forces:
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Net force forward/backward: \[ 5 , \text{N (forward)} - 4 , \text{N (backward)} = 1 , \text{N (forward)} \]
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Net force up/down: \[ 10 , \text{N (up)} - 10 , \text{N (down)} = 0 , \text{N} \]
The net force in the upward/downward direction is zero, meaning there is no vertical movement. However, there is a net force of 1 N in the forward direction.
Therefore, the correct response is:
It only moves forward because there is a net force forward.