The Inclined Plane q Components of Fg 90
- Slides: 11
The Inclined Plane q Components of Fg
90 o - q q Fg
Fg y q 90 o - q q Fg Fg x
Fn friction Fg y q 90 o - q q The block will slide if… Fg Fg x Fgx exceeds max static friction
Example • Determine the acceleration of a 0. 500 kg hovercraft if it is placed on a plank inclined at 10 o. Assume there is no friction. 10 o
Example 2 • Determine the size of a horizontal force needed to keep the 0. 500 kg hovercraft stationary on the plank inclined at 10 o. Assume there is no friction. 10 o
Study Problem # 38 page 119 • The solution is posted to Schoolwires
Example Problem • A 2. 00 kg book rests on a level plank. The plank is gradually tilted more and more by one student while a second student measures the angle of the incline. The students notice the book starts sliding when the plank reaches an angle of 35. 0 o. Additionally, through the use of Logger Pro, they determine the book accelerates down the slope at 1. 00 m/s/s. Explain these observations qualitatively
Example Problem • A 2. 00 kg book rests on a level plank. The plank is gradually tilted more and more by one student while a second student measures the angle of the incline. The students notice the book does not slide at 35. 0 o , but starts sliding when the plank reaches an angle of 35. 1 o. Additionally, through the use of Logger Pro, they determine the book accelerates down the slope at 1. 00 m/s/s. Determine ms and mk
Friction and the Inclined Plane • A plank is tilted until a block on the plank starts to slide. Once it starts to slide, it accelerates down the slope, UNLESS the angle is reduced by 5 ⁰ - 10⁰, in which case, the block will slide at a constant velocity. Why? Construct an FBD and explain these events.
Determine ms • A block of wood is placed on a board. The board is gradually tilted more and more. Which of the forces on the block change as the angle is increased? • By taking one measurement, one can determine the coefficient of static friction. Use a protractor to determine ms for the wood block on the brown side of the whiteboard. • Test your results by calculating how much force should be required to get the block sliding across the level board if 1. 0 kg was on the block.
