Answer True or False 1. If the net or total work done on a particle was not zero

ID: 1354994 • Letter: A

Question

Answer True or False

1. If the net or total work done on a particle was not zero, then its speed mustve changed.

2. If the net or total work done on a particle was not zero, then its velocity mustve changed.

3. If the net or total work done on a particle was not zero, then its direction of motion coudnt have changed.

4. No work is done by the forces acting on a particle if it remains at rest

5. A force that is always perpendicular to the velocity of a particle never does work on the particle.

6. The scalar product cannot have units

7. If the scalar product of two nonzero vectors is zero, then they are parallel

1) True

Reason: Work - energy theorem - Work done is equal to change in kinetic energy

2) True

Reason: Work - energy theorem

3) False,

When direction is reversed, then work is non zero here.

4) True

Object tend to remain in rest until some work is done it

5) TRue

Work is scalar product of force and displacement. When angle is 90 , work done is zero.

6) False

Work done has units of Joules which is a scalar product of force and displacement.

7) False

Scalar product is zero when two vectors are perpendicular.

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