Flashcards in Dynamics Deck (13):

1

## N1L

### States that an object at rest will remain at rest and an object in motion will remain in motion at constant velocity in a straight line in the abscence of external resultant force

2

## Inertia

### Reluctance of a body to change its state of rest or uniform motion in a straight line

3

## Mass

### Measure of a body's resistance to change in velocity

4

## Weight

### Force acting on a mass due to gravitational field

5

## Why do ppl feel weightless

### No contact force, eg astronaut traveling in space

6

## Linear momentum

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Linear momentum of a body is the product of the mass and its velocity. The linear momentum is in the same direction as its velocity

p=mv

7

## N2L

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States that the rate of change of momentum of a body is directly proportional to the resultant force and occurs in the direction of the resultant force

(delta p/delta t)=F

8

## N3L

### States that if body A exerts a force on body B, then body B exerts a force of the same type that is equal in magnitude and opposite in direction on body A

9

## Impulse

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Defined as the product of a force F acting on an object and the time delta t for which the force acts

Impulse=F(delta t)

Also area under F-t graph

10

## Principle of Conservation of Linear Momentum

### States that the total momentum of a system remains constant provide no external resultant force acts on the system

11

## Difference between Elastic, Inelastic & Perfectly inelastic collisions

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Elastic: Total momentum conserved, KE constant

Inelastic: Total momentum conserved, KE not constant

Perfectly inelastic: Total momentum conserved, KE not constant (stick tgt)

Difference in KE is due to dissipative forces

12

## Useful formulas

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m1u1+m2u2=m1v1+m2v2

u1-u2=v2-v1 (only for elastic collision)

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