Physics 111: Elementary Mechanics – Lecture 4

# Physics 111: Elementary Mechanics – Lecture 4

Télécharger la présentation

## Physics 111: Elementary Mechanics – Lecture 4

- - - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - - -
##### Presentation Transcript

1. Physics 111: Elementary Mechanics – Lecture 4 Carsten Denker NJIT Physics Department Center for Solar–Terrestrial Research

2. Newton’s Laws • If no net force acts on a body, then the body’s velocity cannot change. • The net force on a body is equal to the product of the body’s mass and acceleration. • When two bodies interact, the forces on the bodies from each other are always equal in magnitude and opposite in direction. Center for Solar-Terrestrial Research

3. Static & Kinetic Friction Static frictional force Kinetic frictional force Skid marks are 290 m long! k = 0.6 and a = const. How fast was the car going when the wheels became locked? Center for Solar-Terrestrial Research

4. Drag Force and Terminal Speed Drag force Terminal speed Drag coefficient C, air density , and effective cross-section A. Center for Solar-Terrestrial Research