Mechanics modelling assumptions
When we solve mechanics problems, we make some assumptions which make calculations simpler:
- Most objects get modelled as a particle.
- The dimensions of the particle are negligible
- Air resistance usually doesn’t exist.
- We usually ignore friction.
- The direction of movement is the direction of the force.
- No spinning.
- Motion is in a straight line, unless otherwise specified.
flashcards
| Question | Answer |
|---|---|
| Key Term | Answer |
| What is the most common modelling assumption for objects in mechanics? | Objects are modelled as a particle, making their dimensions negligible. |
| What happens to air resistance in standard mechanics models? | Air resistance is usually ignored. |
| What is assumed about friction in many mechanics problems? | Friction is usually ignored. |
| How is the direction of movement related to force in particle models? | The direction of movement is the direction of the force. |
| What assumption is made about spinning in particle models? | No spinning is assumed. |
| How is motion generally treated in mechanics unless specified otherwise? | Motion is in a straight line. |