To sustain circular motion a particle must have a force behind it pushing it in

Question

To sustain circular motion a particle must have a force behind it pushing it in the direction of the motion (in the direction of the velocity which is always along a tangent to the circle). (True/False) __ The Newton is the unit of __ You are given the mass of a certain object. You also know that there are three forces acting on the object: a force of 12 N toward the North, a force of 5 N acting toward the South, and a force of 2 N acting toward the North. If you wish to calculate the acceleration of the object, you must use (besides the given mass): a) the 12N force in Newton's 1st Law, b) the 12N force in Newton's 2nd Law, c) a 9N force in Newton's 2nd Law, d) a 9N force in the 1st Law, e) a 5N force in the 3rd Law, f) a 19N force in the 3rd Law.

Explanation / Answer

8. True

9. Force

10. resultant force = 12-5+2 = 9N . To determine the acceleration, we need to apply Newton's Second Law with a force of 9N.

Correct option is c)a 9N force in newton's 2nd Law

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