Question

can you use a machine to gain both force and speed at the same time? explain.

Answer 1

You can't "gain" force, like you can do with speed. I advise you review the concept of force again. However, you can apply a constant force (like 500 Newton, or 500N) on a vehicle of certain mass (lets say 250kg) so that it gains speed (better: velocity). The vehicle will then accelerate with constant 2 m/s² ( since F = m*a ).

Answer 2

aargh - let's try this again - Openstudy just ate a response...

I believe the question relates to simple machines, such as levers and pulley systems, where a small force at one point in a system can create a large force at another point. Both however do this at the cost of a large motion being converted into a small motion. In the language of the question, this would be "gaining" force, and "losing" speed.

To correctly answer the question, one must pass through an equation for Work. A simple machine produces the same amount of work, as you put into it. Therefore Work in, equals Work out. Work has a relationship to Force and Distance. Time is fixed, Distance/Time is Speed.

If you plug those bits together, you can answer your question.