Eusex County College Mathematics and Physies Division College Physics I-PHY 101

Question

Eusex County College Mathematics and Physies Division College Physics I-PHY 101 Test 3 Name: No partial credit (2 pts. each) 1. Suppose several forces are acting upon a mass m. The force F in F- ma refers to A) any particular one of the forces acting on m. B) the vector sum of all the forces acting on m. C) the force of friction acting on m. D) the arithmetic sum of all the forces acting on m. 2. A steel ball is tied to the end of a string and swung in a horizontal circle at constant speed Complete the following statement: A) perpendicular to the circle B) toward the center of the cirele. The direction of the acceleration of the ball is always C) tangent to the circle. D) radially outward from the circle. E) vertically downward 3. Which one of the following terms is used to indicate the natural tendency of an object to remain at rest or in motion at a constant speed along a straight line? A) velocity B) inertia C) acceleration D) equilibrium E) force 4. A rock is suspended from a string; and it moves downward at constant speed. Which one of the following statements is true conceming the tension in the string if air resistance is nor ignored? A) The tension is zero newtons. B) The tension points downward. C) The tension is equal to the weight of the rock. D) The tension is less than the weight of the rock. E) The tension is greater than the weight of the rock.

Explanation / Answer

1) (B) the vector sum of all the forces acting on m.

2) B)  towards the center of the circle

3) B) Inertia

4) D) The tension is less than the weight of the rock. (because of the air resistance acting on the rock)

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