Al of the statements below are false or nonsensical, either partially or entirel

Question

Al of the statements below are false or nonsensical, either partially or entirely. Give a brief explanation, sketch, and/or counter-example why, or under what circumstances the statement is false.

a) the direction of acceleration for an object is the same as for the net work done on the object.

b) If object A has a greater angular velocity than object B, object A must have a greater net torque on it.

c) If object A and B collide in an elastic collision, they will exchange velocities.

d) An object with friction on it must be slowing down.

Explanation / Answer

a) the direction of acceleration for an object is the same as for the net work done on the object.

The acceleration is a vector and the work is not.

b) If object A has a greater angular velocity than object B, object A must have a greater net torque on it.

If the total torque is zero, the angular moment is constant and it depends of the angular velocity

c) If object A and B collide in an elastic collision, they will exchange velocities.

the final velocities will depend of the initial velocities and the masses of the objects, furtheremoe, the momentum must be conserved in an elastic collision and if there is conservation of the kinectic enery theer wont be deformation.

d) An object with friction on it must be slowing down.

The body slows down when there is friction between the surface, except in the vacuum where there is no friction and the object can still moving

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.