Question

Select "Motion" in the Forces and Motion: Basics HTML5 simulation. You should see a mannequin-like figure standing next to an object on a skateboard. Check the "Force", "Values", "Masses", and "Speed" boxes, then click, drag, and hold the Applied Force slider to apply a force on the object. Try the following combinations: 500 N of force on one 50 kg crate to get it up to the maximum speed (40 m/s), then 500 N of force in the opposite direction to bring it to a stop. Same as before, but with two 50 kg crates (so 100 kg in total). Same as before, but with the 100 kg trashcan on top of one crate (150 kg in total). Same as before, but with just the 200 kg refrigerator. Given your observations for how easy or difficult it is to change the motion of these objects, do one last trial with the giftbox of unknown mass. What do you think is the likeliest mass of this giftbox? a. 50 kg b. 150 kg c.100 kg d.200 kg

Answer 1

500 N of force on one 50 kg crate to get it up to the maximum speed (40 m/s), then 500 N of force in the opposite direction to bring it to a stop

For this one, I applied the force on the right side and took the box to 40 m/s then I applied the force on left side, the force. It was pretty easy to change the motion of the single 50 Kg crate.

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two 50 kg crates (so 100 kg in total).

It was bit difficult and took more time to change the motion

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with the 100 kg trashcan on top of one crate (150 kg in total).

It took relatively long to change the motion. we observe that as we add more and more load, it keeps taking more time to stop and change the motion direction.

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with just the 200 kg refrigerator.

It took relatively long to change the motion. we observe that as we add more and more load, it keeps taking more time to stop and change the motion direction.

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one last trial with the giftbox of unknown mass. What do you think is the likeliest mass of this giftbox

I think the mass of giftbox is 50 kg as it took least amount of time to change its motion.