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A cart of mass 0.85 kg is on a track, connected by a string over a pulley to a hanging mass of 0.1 kg. A friction pad is attached to the bottom of the cart, and you push the cart so that it first moves toward the sensor, then away from the motion sensor.
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- If I pull a 120kg sled with 240N of force and it accelerates with an acceleration a=0.5m/s^2, what is the coefficient of friction between the box and the floor? I now have my 20kg dog in the sled. If I pull with the same force, what is the acceleration of the sled?Figure 4 shows the 40 kg concrete block is pull by electric motor. The force or tensionin cable is about F = (120t1/2) N, that the t is in seconds. By using Principle of NewtonLaw, determine the concrete block’s velocity for t = 6 s. Assuming it is originally atrest and the coefficient of static and kinetic friction between the concrete bock and thefloor surface are about μs = 0.5 and μk = 0.4, respectivelyA 7.0-N force parallel to an incline is applied to a 1.0-kg crate. The ramp is tilted at 20° and is frictionless. (a) What is the acceleration of the crate? (b) If all other conditions are the same but the ramp has a friction force of 1.9 N, what is the acceleration?
- A box of bananas weighing 40.0 N rests on a horizontal surface.The coefficient of static friction between the box and the surfaceis 0.40, and the coefficient of kinetic friction is 0.20. If the monkey applies a horizontal force of 18.0 N, what is the magnitude of the friction force and what is the box’s acceleration?A horizontal force of 680 N is needed to overcome the force of static friction between a level floor and a 269 kg crate. What is the acceleration of the crate if the 680N force maintained after the crate begins to move and the coefficient of kinetic friction is 0.15?Two boxes (Box A = 9.7 kg and Box B = 5.4 kg) are connected by acord running over a pulley. The coefficient of kinetic friction betweenbox A and the table is 0.18. We ignore the mass of the cord and pulleyand any friction in the pulley, which means we can assume that a forceapplied to one end of the cord will have the same magnitude at theother end. We wish to find the tension of the cord while accelerating (inN), assuming the cord doesn’t stretch. As box B moves down, box Amoves to the right. Hint: Solve for the acceleration of the system first.
- Commercial airplanes are sometimes pushed out of the passenger loading area by a tractor. (a) An 1800-kg tractor exerts a force of 1.75×104N backward on the pavement, and the system experiences forces resisting motion that total 2400 N. If the acceleration is 0.150 m/s2, what is the mass of the airplane? (b) Calculate the force exerted by the tractor on the airplane, assuming 2200 N of the friction is experienced by the airplane. (c) Draw two sketches showing the systems of interest used to solve each part, including the free-body diagrams for each.A rope 10 m long is stretched between a tree and a car. A man pulls with a force of 10 N at right angles to ang at the middle of point of the rope and moves this point 0.5m. Assuming no stretching of the rope (theoretical), what is the tension in the rope at the final position?The wheel motor attaches to the cable with a constant acceleration, such that the 20kilogram crate moves a distance of six meters (s) in 3 s, starting from zero velocity.Determine the tension in the cable. The coefficient of kinetic friction between the crateand the plane is mk = 0.3. Box the acceleration and the normal force as well.
- On an inclined plane, a sliding object is acted upon by a component of the gravity. What would be the equation of the force acting upon a sliding object, if the inclined plane is frictionless?A 0.3 kg book is being pushed by a horizontal force of 1.1 N, where t is the time that the book is experiencing this applied force over 1.1s. Hot fast is the book moving at this time of it started from rest? Assume that the book of sliding over a non uniform surface with the coefficient of kinetic friction that is changing as: 0.4 t.A contestant in a winter games event pulls a 60.0 kg block of ice across a frozen lake with a rope over his shoulder as shown. The coefficient of static friction is 0.1 and the coefficient of kinetic friction is 0.03. (a) Calculate the minimum force F he must exert to get the block moving. (b) What is its acceleration once it starts to move, if that force is maintained?