MULTIPLE CHOICE QUESTIONS I- To determine the work done on an object in a particular direction.......
MULTIPLE CHOICE QUESTIONS
I- To determine the work done on an object in a particular direction....
| A- |
we consider all forces on the object regardless of their direction. |
|
| B- |
we consider only frictional forces. |
|
| C- |
we consider only forces that are in the same direction as the position change. |
|
| D- |
- we don't consider forces at all. |
II- To determine the work done on an object in a particular direction....
| A- |
we consider all forces on the object regardless of their direction. |
|
| B- |
we consider only frictional forces. |
|
| C- |
we consider only forces that are in the same direction as the position change. |
|
| D- |
we don't consider forces at all. |
III- There are two types of collisions we discuss in physics: elastic and inelastic. A tennis ball hitting a racket is an example of...
| A- |
an elastic collision. |
|
| B- |
an inelastic collision. |
Homework Answers
Multiple questions posted, so answering only the first question:
1.
Work done is given by dot product of force and displacement vectors.
Now,Dot product of force and displacement vectors is equal to (magnitude of displacement)*(component of force along the displacement vector).
So, for calculating work, we consider only those components of forces that are in the same direction as position change.
So,option C is correct.
2. Same as part 1.
Add Answer to:
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