Which combination of options is most accurate (A) Acceleration always means an o

Question

Which combination of options is most accurate (A) Acceleration always means an object's speed is increasing or decreasing. (B) When the net force is perpendicular to momentum, the object will turn. (C) A projectile's time in the air is fully determined by its initial horizontal velocity. (D) Change in momentum is directed in the same direction as the net force. (E) None of the above Which combination of options is most accurate (A) Equilibrium corresponds to when the potential energy of a system is zero. (B) The total reversible force on a system is zero when its potential energy is at a minimum. (C) Work is only done on a system if the system's kinetic energy increases. (D) Work only occurs if the forces go through a displacement. (E) None of the above Which statements are most accurate? (A) If net force is zero then an object's momentum is zero. (B) Net force equals the sum of the magnitudes of all the forces on an object. (C) If an object is in translational equilibrium, then the net force on the object is zero. (D) Every force on an object is balanced by another equal magnitude, oppositely directed force on that object. (E) None of the above You throw a ball up in the air 4) Which of the following forces would appear in the ball's free body diagram? (A) The normal force (B) The force of your throw. (C) The force of the ball's motion (D) The net force on the ball (E) None of the above

Explanation / Answer

1 ) in circular motion speed does not change but acceleration is there which change the velocity.

If net force perpendicular to the momentum then object will turn as velocity is perpendicular to net force & this net force provide centripetal force

A projectile time in the air also depend on gravity and resistive forces so it is not only depend on initial horizontal

No

velocity

Change in momentum is always directed in the net force direction. As force is applied for certain interval and it gives change in momentum. If force is negative then momentum change is negative and vice versa but final momentum may be positive or negative.

2) stable Equilibrium corresponds to when potential and kinetic energy both zero

The potential energy is at a local maximum, which means that the system is in an unstable equilibrium state. If the system is displaced an arbitrarily small distance from the equilibrium state, the forces of the system cause it to move even farther away.

In simple harmonic motion potential energy is minimum at equilibrium position but spring forces acts which are reversible

Negative work decreases kinetic energy like friction

Work occurs only when displacement in the object. Work is the dot product of force and displacement so right.

3) net force on the system is zero then momentum will not change i.e. Newtons first law of motion

Net force is the vector sum of all forces not magnitude. As magnitude always be positive but forces direction may be negative

No net force may not be zero like in circular motion of objects. There is no translational motion but centripetal force is there.

Yes newtons third law every action has equal and opposite reaction

4) None of the above as ball is in air no contact force and net force gives the acceleration but not come in FBD. Force give momentum so it will not come in the diagram

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