Problem: The motorcycle shown in Fig. below has a mass of 125 kg and a center of mass at G1 , while the rider has a mass of 75 kg and a center of mass at G2 . Determine the minimum coefficient of static friction between the wheels and the pavement in order for the rider to do a "wheely," i.e., lift the front wheel off the ground as shown in the photo. What acceleration is necessary to do this? Neglect the mass of the wheels and assume that the front wheel is free to roll.

Problem: The motorcycle shown in Fig. below has a mass of 125 kg and a center of mass at G1 , while the rider has a mass of 75 kg and a center of mass at G2 . Determine the minimum coefficient of static friction between the wheels and the pavement in order for the rider to do a "wheely," i.e., lift the front wheel off the ground as shown in the photo. What acceleration is necessary to do this? Neglect the mass of the wheels and assume that the front wheel is free to roll.

International Edition---engineering Mechanics: Statics, 4th Edition

4th Edition

ISBN:9781305501607

Author:Andrew Pytel And Jaan Kiusalaas

Publisher:Andrew Pytel And Jaan Kiusalaas

Chapter7: Dry Friction

Section: Chapter Questions

Problem 7.8P: The brake pads at C and D are pressed against the cylinder by the spring BF. The coefficient of...

See similar textbooks

Similar questions

The coeffient of static friction between the uniform bar AB of weight W and the ground is 0.45. Find the smallest angle and the corresponding force P that would initiate simultaneous tipping and sliding of the bar.
The block of weight W is pulled by the force P inclined at the angle to the horizontal. Find the smallest force P and the corresponding angle that would cause impending sliding of the block. The angle of static friction between the block and the ground is s.
The square-threaded screw with a pitch of 10 mm and a mean radius of 18 mm drives a gear that has a mean radius of 75 mm. The static and kinetic coefficients of friction between the gear and the screw are 0.12 and 0.06, respectively. The input torque applied to the screw is C0=10Nm. Assuming constant speed operation, determine the output torque C1 acting on the gear.
The brake pads at C and D are pressed against the cylinder by the spring BF. The coefficient of static friction between each pad and the cylinder is 0.15. Find the smallest tension in the spring that would prevent the cylinder from rotating when the clockwise couple M=2200lbin. is applied. Neglect the weights of the members.
A flat belt passes over two idler pulleys and under a rotating drumof diameter 8 in. The axle of the drum is free to move vertically ina slot, and a spring keeps the drum in contact with the belt. Whatis the minimum force which should be exerted by the spring if slippageis not to occur when a 30-lb · ft torque is applied to the drum? Thecoefficient of static friction between belt and drum is 0.30 and theangle of contact is 180 degrees.
An amusement park ride consists of a large vertical cylinder that spins about its axis fast enough that any person inside is held up against the wall even when the floor is removed. The coefficient of static friction between the person and the wall is u, = 0.3 and the radius of the drum is R = 2m. (a) Find wmin. the minimum angular speed at which the drum should rotate such that the person is held up even if the floor is removed. (hint: when the floor is removed, the person is held up by the static frictional force). (b) Find the linear speed of the person when the drum is rotating at the minimum angular speed you found in (a) (c) Suppose that the drum started from rest and reached the speed you found in (a) in 120 seconds. During this time the drum had constant angular acceleration. Find the number of rotations made by the person within this time.
A car with a four-wheel drive weighs 3000 lb and has a wheelbase of 10 ft. The e.g. is 3 ft above the pavement and 4 ft ahead of the rear wheels. Compute the active force acting at the rear wheels when the car accelerates at 1/3 g ft per sec^2? Asume the coefficient of friction is equal at all four wheels.
Show Attempt History Current Attempt in Progress Calculate the horizontal force P on the light 14° wedge necessary to initiate movement of the 33-kg cylinder. The coefficient of static friction for both pairs of contacting surfaces is 0.25. Also determine the friction force Fg at point B. (Caution: Check carefully your assumption of where slipping occurs.) Answers: P= Incorrect FB = i i 20 33 kg B eTextbook and Media A ! N ! N Save for Later Last saved 1 hour ago. Saved work will be auto-submitted on the due date. Auto- submission can take up to 10 minutes. Attempts: 2 of 3 used Submit Answer
A cube with mass of m=80N is on the inclined plane with angle of phi=20 degrees. coeficient of static friction /mu_s = 0.25 coeficient of dynamic friction /mu_k = 0.15 Determine: what is the smallest size of the force F parallel to the inclined plane, which prevents the cube in the slide? what is the smallest size of the force F, which the cube starts to move along the inclined plane up? At what value of the force F starts the cube to rise at a constant speed?
The uniform cylindrical drum D weighs 42.0 lb. The coefficient of static friction at all surfaces is 0.600, and the coefficient of kinetic friction is 0.500 at all surfaces. The cylinder is pushed by force P applied to a pad as shown, and it is intended for the cylinder to translate horizontally without rotation. a) Calculate the minimum force P required.b) Calculate the acceleration of the drum.
3) The cart shown below weighs 45o lb (weight located at CG, at geometric center of cart). If the wheels are locked, and the coefficient of static friction between the wheels and the ground is o.4 (), will the cart slide down the hill? Yes/No: 8 ft 3 ft CG 1 ft 6 ft 15
Calculate the maximum force P that can be applied without causing any motion for the given coefficients of static friction. The weight of block A is 20 lb. and that of B is 10 lb. MB = 0.4 2 ft. B A 3 ft. MA=0.5 P MD=0.3 D Pc=0.35 C