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- You want to move a 500-N crate across a level floor. To start the crate moving, you have to pull with a 230-N horizontal force. Once the crate "breaks loose" and starts to move, you can keep it moving at constant velocity with only 200 N. What are the coeffi- cients of static and kinetic friction?On a beautiful winter Sunday, you drag your two nieces in a sleigh on a snowy sidewalk. You pull on the rope with a force of 50N oriented 30 degrees above the horizontal. Julie, 25 kg, is in the first sled. Behind her, tied by another rope, is Marie's sled, 15 kg. Calculate the acceleration experienced by your nieces: Calculate the tension in the middle string (between the two sleds):A woman at an airport is towing her 22.0 kg suitcase at constant speed by pulling on a strap at an angle ? above the horizontal (see figure). She pulls on the strap with a 38.0 N force, and the friction force on the suitcase is 20.0 N. What angle does the strap make with the horizontal (in degrees)? What is the magnitude of the normal force that the ground exerts on the suitcase (in N)? What If? If the woman still pulls on the strap with a 38.0 N force but wishes to accelerate the suitcase at a rate of 0.500 m/s2, at what angle (in degrees) must she pull on the strap? Assume that the rolling friction is independent of the angle of the strap. What is the maximum acceleration of the suitcase if the woman can exert a maximum force of 38.0 N? (Enter the magnitude in m/s2.)
- A 10 kg box experiences a force of 15 Newtons in the positive x-direction and 8 Newtons in the negative y-direction. What is the magnitude of the net force acting on the box? Answer in Newtons.Joe pushes down the length of the handle of a 14.1 kg lawn spreader. The handle makes an angle of 47.1° with the horizontal. Joe wishes to accelerate the spreader from rest to 1.39 m/s in 1.7 s. What force must Joe apply to the handle? Answer in units of N.A heavy crate of mass 46.0 kg is pulled at constant speed by a dockworker who pulls with a 330-N force at an angle ? with the horizontal (see figure below). The magnitude of the friction force between the crate and the pavement is 221 N. What is the angle ? of the rope with the horizontal? What is the magnitude of the normal force exerted by the pavement on the crate?
- The net external force on a 24 kg mower is known to be 51 N. a) If the force of friction opposing the motion is 27 N, what force F (in newtons) is the person exerting on the mower? b) Suppose the mower is moving at 1.2 m/s when the force F is removed. How far will the mower go before stopping in m?A box with mass 32.5 kg rests on a frozen pond, which serves as a frictionless horizontal surface. If a fisherman applies a horizontal force of 14.0N to the box causing it to accelerate to the right. What is the acceleration produced? How far does the crate travel in 10.0 seconds?A 55.0 kg block is pulled along a frictionless surface with a force P, exerted at an angle of 25.0 ̊ above the horizontal. What is the minimum force P that will lift the block off the ground? If the block is pulled with half of this force, what will its acceleration be?
- A warehouse worker applies a force F to accelerate two crates, mã and mp, to the right along a rough floor. Crate mд has a mass of 4m, crate mp has a mass of m. Choose 1 answer: A F Which is the correct relationship between the applied force F acting on mд and the force mд exerts on mB? B D MA mB The force Facting on my is smaller than the force that mA exerts on MB. The force Facting on my is the same as the force that mA exerts on MB. The force Facting on my is larger than the force that mд exerts on MB. The answer depends on the relative size of the friction force on MA and MB.A 2kg box is being pulled up a ramp by a force of 24N. The ramp is at an angle of 35 degrees from the ground. The force of friction on the box is 1.5N. What is the net horizontal force in the x-direction? What is the magnitude of the normal force acting on the block?A child pulls on a wagon handle at an angle of 23.8 degrees above the horizontal with a force of 68 N. If the wagon accelerates at 2.61 m/s² horizontally, what is the mass (in kg) of the wagon? Assume friction is negligible. Your Answer: units Answer