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UCF L1 Movie 1: Two fan units of different strengths push on cart in opposite directions

UCF L1 Movie 2: Simulation: What single fan force has the same effect as two fan forces pointed in same direction?

UCF L1 Movie 3: Simulation: What single fan force has the same effect as two fan forces pointed in opposite directions?

UCF L1 Movie 4: Unbalanced combination of fan forces on a cart that is already moving

UCF L1 Movie 5: Simulation: What single force has the same effect as multiple forces on an object already moving?

UCF L1 Movie 6: Simulation: Motion of cart moving in direction of weaker force

UCF L1 Movie 7: Simulation: In scenario for Movie 6, what single force produces equivalent motion?