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- What is the coefficient of kinetic friction μk between the block and the tabletop?A child shoves a 4.6 kg block so that it starts traveling across a level floor with an initial velocity of 3.6 m/s. If the coefficient of kinetic friction between the block and the floor is 0.29, how far will it travel before coming to rest? d = mA block of mass m is moving on a smooth surface in the +x- direction with initial vi. It slides accross a rough segment of width d and coefficient of kinetic friction uk and continues along the smooth surface. Find an expression for its new velocity.
- A 392-N force parallel to the plane is required to support a body on an inclined plane of height 300 m and base 400 m. If the force exerted by the plane on theb body is 780N, a. what is the weight of the body? b. what is the frictional force between the body and the plane?Check Your Understanding A block of mass 1.0 kg rests on a horizontal surface. The frictional coefficients for the block and surface are s=0.50and k=0.40 . (a) What is the minimum horizontal force required to move the block? (b) What is the block’s acceleration when this force is applied?(a) What is the maximum frictional force in the knee joint of a person who supports 66.0 kg of her mass on that knee? (b) During strenuous exercise, it is possible to exert forces to the joints that are easily 10 times greater than the weight being supported. What is the maximum force of friction under such conditions? The frictional forces in joints are relatively small in all circumstances except when the joints deteriorate, such as from injury or arthritis. Increased frictional forces can cause further damage and pam.
- (a) Find an equation to determine the magnitude of the net force required to stop a car of mass m, given that the initial speed of the car is v0 and the stopping distance is x . (b) Find the magnitude of the net force if the mass of the car is 1050 kg, the initial speed is 40.0 km/h, and the stopping distance is 25.0 m.A block, initially at rest, has a mass m and sits on a plane inclined at angle theta. It slides a distance d before hitting a spring and compresses the spring by a maximum distance of xf. If the coefficient of kinetic friction between the plane and block is uk, then what is the force constant of the spring?A 250 N block is initially at rest on a flat surface that is inclined at 30°. if the coefficient of the static friction is 0.30, find the force required to start the block moving up the plane.
- A 100 N box is in an impending motion down the plane when the angle of inclination of the plane is 39o. What is the coefficient of kinetic friction between the bow and the plane?A 250lb block is initially at rest on the flat surface that is inclined at 30 degree. If the coefficient of kinetic friction is 0.30 and the coefficient of static friction is 0.40, find the force required to start the block moving up the planeA 1500 N block is in contact with a level plane whose coefficient of kinetic friction is 0.12. If the block is acted upon by a horizontal force of 250 N, what time, in seconds, will elapse before the block reaches a velocity of 14.5 m/s, starting from rest?