Ex. (2): The force P, which is applied to the 10-kg block initially at rest, varies linearly with time as showed. If the coefficients of static and kinetic friction between the block and the horizontal surface are 0.60 and 0.40, respectively, determine the velocity of the block when t = 1,3,5 and 7 seconds. P(N) 10 kg 100 H 0.60, 4, 0.40 I (s)

Ex. (2): The force P, which is applied to the 10-kg block initially at rest, varies linearly with time as showed. If the coefficients of static and kinetic friction between the block and the horizontal surface are 0.60 and 0.40, respectively, determine the velocity of the block when t = 1,3,5 and 7 seconds. P(N) 10 kg 100 H 0.60, 4, 0.40 I (s)

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 7.79P: The coefficient of rolling resistance between the 30-kg lawn roller and the ground is r=0.1. (a)...

See similar textbooks

Similar questions

The lower block of mass m2 = 3.2 kg is pulled on by a rope with a tension force of 28 N. The upper block has mass m1 = 1.8 kg. The coefficient of kinetic friction between the lower block and the surface is 0.32. The coefficient of kinetic friction between the lower block and the upper block is also 0.32. What is the acceleration of the 3.2 kg block?
A 25-kg block is initially at rest on a horizontal surface, and a horizontal force of 75.0 N is required to set the block in motion after which a horizontal force of 60.0 N is required to keep the block moving with constant speed. Find (a) the coefficient of static friction and (b) the coefficient of kinetic friction between the block and the surface.
the 3-kg collar shown has a coefficient of kinetic friction uk=0.22 with the shaft. the spring is unstretched when s=0 and the collar is given an initial velocity of v0=19.5 m/s. the unstretched length of the spring is d=1.5m and the spring constant is k=597 N/m. What is the speed of the collar afer it has moved 1.5m?
The blocks A and B shown in the figure are originally at rest, and all contact surfaces are smooth(frictionless). If a towing force given in the otherfigure, acting horizontally, is applied to block A for 3 s, determine the final velocities of the blocks at time t=3 s.Note: The blocks masses are mA= 5 kg and mB=3 kg.
A 2-ton trailer truck travels down a road with slope 0.2 with a speed of 20 kph. If the truck driver pressed the brakes hard and in that exact time a wind blew with a force of 500 Newtons against the truck, determine how far the tires skid on the road if the coefficient of kinetic friction between the wheels and the road is 0.6.
A sled weighing 100 lb reaches the foot of a hill with a speed of 40 ft/s. The coefficient of kinetic friction between the sled and the horizontal surface of the ice at the foot of the hill is 0.03. Determine the force exerted by the sled.
A block of mass 20 kg is released from rest at the top of a ramp as shown in Figure 4. Thecoeficient of kinetic friction between block and ramp is μk = 0.25. When the block reaches thebottom ramp, it slides onto a belt moving to the right at constant speed, vc = 5 m/s. The kineticfriction coeficient between the block and belt is μk = 0.2. Determine the distance, d that theblock slides along the belt before the block’s velocity matches the velocity of the belt.
The force F, acting in a constant direction on the 22-kg block, has a magnitude that varies with the position s of the block. When s = 0 the block is moving to the right at v = 6 m/s. The coefficient of kinetic friction between the block and surface is μk= 0.3. Determine how far the block must slide before its velocity becomes 15 m/sm/s. Express your answer to three significant figures and include the appropriate units. Hint 1for Part A. How to approach the problem Use the principle of work and energy for the particle, which states that the particle's initial kinetic energy plus the work done by all the forces acting on the particle as it moves from its initial to its final position is equal to the particle's final kinetic energy. Note that besides force FF shown in the figure, the friction force acts on the block during its motion. Hint 2for Part A. How to find the friction force The friction force is directly related to the normal reaction, which in turn equals…
The force F, acting in a constant direction on the 22-kg block, has a magnitude that varies with the position s of the block. When s = 0 the block is moving to the right at v = 6 m/s. The coefficient of kinetic friction between the block and surface is μk= 0.3. Determine how far the block must slide before its velocity becomes 15 m/sm/s. Express your answer to three significant figures and include the appropriate units. Hint 1for Part A. How to approach the problem Use the principle of work and energy for the particle, which states that the particle's initial kinetic energy plus the work done by all the forces acting on the particle as it moves from its initial to its final position is equal to the particle's final kinetic energy. Note that besides force FF shown in the figure, the friction force acts on the block during its motion. Hint 2for Part A. How to find the friction force The friction force is directly related to the normal reaction, which in turn equals…
A constant force of ''F'' acts on a mass as shown. The mass starts its motion from rest at position 1, the unstretched length of the spring is 250 mm, and the spring modulus is k=1,5 k?/m. Neglecting the friction, determine the required force ''F'' to cause the 2−kg mass to have a speed of v2=1,5 m/s at position 2.
consider the mass and pulley system in the attached file. mass m1 = 29 kg and mass m2 = 12kg. the angle of the inclined plane is given and the coefficient of kinetic friction between mass m2 and the inclined plane is uk = 0.12. assume the pulleys are massless and frictionless if the system is released from rest, what is the speed of mass m2 after 2.5 s? v(2.5 s) = ?
a 3.0 kg block start from rest at the top of a 30 incline and slides 2.0 m down the incline in 1.5seconds. determine determine the magnitude of the accaleration of the block. the coefficient of kinetic friction between the block and the plane. the frictional force acting on the block the speed of the block after it slides 2.0 m.