Ch. 6 slides.ppt Forces2.ppt

Push block similar to Problem 5-39 a) Barry applies a horizontal force to a 6 kg wooden block resting on the floor. The coefficients of friction between the block and the floor are µk = 0.20 and µs = 0.5. What is the minimum force that will cause the block to move? What is the acceleration of the block if a 60 N force is applied to the block? Forces2.ppt

Block on Incline 1 A block of mass 2 kg is placed on a 20° incline. Does the block slide down the incline? If so, calculate the acceleration. Forces2.ppt

Block on Incline 2 A block of mass 2 kg is placed on a 30° incline and given a push, so it starts with a velocity of 1 m/s. How fast is the block going at the end of the 2 m long ramp? Forces2.ppt

Quick Stop A car traveling at 20 m/s stops in a distance of 50 m. Assume that the deceleration is constant. The coefficients of friction between a passenger and the seat are µs = 0.5 and µk = 0.3. Will a 70 kg passenger slide off the seat if not wearing a seat belt? Justify your answer. Forces2.ppt

Scales in Elevators A 50 kg student gets in a 1000 kg elevator at rest. As the elevator begins to move, she has an apparent weight of 600 N for the first 3 s. How far has the elevator moved, and in which direction, at the end of 3 s? Forces2.ppt