Truc and False: 4 Points Fach dny an rded on the Scantron answer page will NOT h

Question

Truc and False: 4 Points Fach dny an rded on the Scantron answer page will NOT he counted ce between thc ive stays on the curve because the centripctal force is supplied by the kinetie A ear going around a flat curve frictional force tires of the car and the road surface. A) True B) False of the object. A) True B) False to the circl A) True B) False 2. The force due to friction for an object moving on a surface is always in the opposite direction as the motion 3. The direction of the centripetal acceleration of a mass traveling with un 4. The Kinetic frictional force is the force whi ch must be overcome to start an object moving A) True B) False 5. Your mass is the same anywhere in the Universe, while your weight depends on where you are! A) TrueB) False 6. Kinetic energy is the energy of position. A) True B) False 7. "A body with mass m that is either at rest or has a constant velocity remains at rest or continues to have a constant velocity unless acted upon by a net extenal force," is known as Newton's Law of Universal Gravitation. A) True B) False 8. For an object with mass m that is on an inclined plane, the normal force is less than the weight of the object. A) True B) False

Explanation / Answer

1. False

static firction provides force not kinetic friction.

2. No, if static friction can act in same direction.

False

3. centripetal acc is always toward the center. (radial direction)

False

4. you have to overcome static friction not kinetic friction.

False

5. True.  

mass is absolute and weight, W = m g

6. energy of position is potential energy .

False

7. False.

this is law of inertia.

8. on incline, perpendicular to incline,

N - m g cos(theta) = 0

so N = m g cos(theta)

and cos(theta) < 1

so N < mg

Ans: True

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