The blocks are joined by an inextensible cable as shown. If the system is released from rest, what is the tension (in Newton) produced in the cable after block A has moved 2m? Assume the coefficient of kinetic friction between block A and the plane is 0.25 and the pulley is weightless and frictionless. The Mass of A is 200kg; the Mass of B is 300kg.

The overworked Amazon delivery person is driving up a steep hill with an incline of 26° when a box they forgot to secure starts sliding toward the back of the truck. The 3.5 kg box starts from rest near the drivers seat and slides 2.1 m along the floor to the rear door. The coefficient of kinetic friction between the box and the floor is 0.36. What is the work done by the weight of the box? Wmg What is the work done by the Normal Force? WN What is the work done by the frictional force? Wf = = = J What is the net work done on the box? Wnet = What the change in kinetic energy for the box? AKE = How fast is the box moving just before it hits the rear door? Vfinal = S

Mary and her sister are playing with a cardboard box on the neighborhood hill. Mary climbs into the box, the total mass of the box with Mary in it is 115 kg. The box starts at rest at the beginning of the incline. The hill is at an incline of 28 degrees with respect to the horizontal.The static and kinectic friction between the box and hill is 0.4 and 0.2 respectively. Assume that Mary is now in the box, but has not started to move. a. What is the gravitational force acting on the box and child system?b. What is the magnitude of the normal force acting on the box?c. What is the reaction force associated with the normal force found in the previous step.

Pravinbhai

Dynamics

When Crates A and B of mass ma = 31 kg and mB = 78 kg are released from rest, Crate A moves to the right on a rough surface (u = 0.4 ). The force P = 20 Newtons is always acting on Crate B. The linear spring has a stiffness of k = 490 N and is initially stretched 0.4 meters before the system is released from rest. Neglect the mass of the pulleys and cables and neglect friction in the pulley bearings. Determine the work done by the weight of Crate B (in Joules) when Crate A has moved a distance of 0.8 meters to the right. Consider g = 10 m. 82 B

5. Three blocks are connected over two frictionless, massless pulleys by two inextensible, massless cords as shown in the figure. There is friction between block m and the horizontal surface of the table. If the block m, moves downward after being released from rest, then what is the magnitude of the acceleration of the blocks and the magnitude of the tension in the cords in terms of the masses of the blocks m, , and ms, the coefficient of kinetic friction between block my and the table, a. and the acceleration due to gravity, g. Include a force diagram or free-body diagram of the situation.

Two objects with masses of 2.55 kg and 4.15 kg are connected by a light string that passes over a light frictionless pulley to form an Atwood machine. (a) Determine the tension in the string. (b) Determine the acceleration of each object. (c) Determine the distance each object will move in the first second of motion if they start from rest.

1) A loaded wheelbarrow is pulled to the left with an acceleration a = 2 m / s? by a force P. In this motion, the wheelbarrow does not rotate and the force of friction as well as the effect of the rotation of the wheel may be neglected. The combined mass of the wheelbarrow and its load is 250 kg with center of mass at G. For this instant, determine the horizontal and vertical components of the force P and the normal reaction at B. a P G beal 60 cm 50 cm 1 m 20 cm

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