Physics for Scientists and Engineers
6th Edition
ISBN: 9781429281843
Author: Tipler
Publisher: MAC HIGHER
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Chapter 5, Problem 32P
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To move a large crate of mass 32.0 kg across a rough floor, with coefficient of kinetic friction between the crate and the floor is k = 0.45, you pull on it with a Force P at an angle of 30o above the horizontal and some else also pushes on the crate with a force F at an angle 45o below the horizontal. (The applied forces, F & P, on the crate starts it moving.) (a) Find the Normal force acting on the crate. (b) Find the acceleration of the crate if the applied force is F = 130 N & P = 300 N.
A 4-kg block rests on a horizontal surface. The block is pulled by 20 N force acting 25⁰ above the horizontal but not enough to move the block.
Calculate the following:
(a) the friction force between the surface and the block.
(b) the normal force on the block.
(c) the coefficient of static friction.
A man exerts a horizontal force of 125 N on a crate with amass of 30.0 kg. (a) If the crate doesn’t move, what’s the magnitudeof the static friction force? (b) What is the minimumpossible value of the coefficient of static friction between thecrate and the floor?
Chapter 5 Solutions
Physics for Scientists and Engineers
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- Two adults and a child want to push a wheeled cart in the direc- tion marked x in Fig. zontal forces F and F, as shown. (a) Find the magnitude and direction of the smaliest force that the child should exert. Ignore the effects of friction. (b) If the child exerts the minimum for e found in part (a), the cart ac- celerates at 2.0 m/s² in the +x-direction. What is the weight of the cart? The two adults push with hori-arrow_forwardA force of 600 N is applied on a block of mass M to pull it at a constant velocity up the incline at an angle of 30degrees with the horizontal. The coefficient of kinetic friction between the surface of the incline and the block is 0.5. Calculate the mass of the block.arrow_forwardOur 10kg mystery box rests on a horizontal floor. The coefficient of static friction is 0.40and the coefficient kinetic friction is 0.30. Determine tge force of friction, acting on the box if a horizontal applied force is exerted on it of magnitude: (a) 0, (b) 10N, (c) 20N (d) 38N, and (e) 40N.arrow_forward
- A force of 300 N is applied to a 20 kg crate at an angle of 30o below the horizontal. Determine the acceleration of the crate as it moves along the horizontal surface. The coefficient of friction between the crate and the surface µk is 0.50.arrow_forwardA crate weighing 640 N is acted upon by a 410 N horizontal force. The coefficient of friction between surfaces is 0.25. (a) find the frictional force acting on the crate (b) find the acceleration and the distance moved in 10s and (c) what additional distance is travelled before stopping if the 410 N force stops acting after 10 s?arrow_forwardA 100-N block on a rough 30o-incline is acted upon by a force P as shown causing it to accelerate at 2 m/s2 down the plane. The coefficient of kinetic friction is 0.30. (a) Draw the FBD of the block (b) Find the magnitude of P.arrow_forward
- A 45.0-kg crate of tools rests on a horizontal floor. You exert a gradually increasinghorizontal push on it and observe that the crate just begins to move when your forceexceeds 313 N. After that you must reduce your push to 208 N to keep it moving at asteady 25.0 cm/s. (a) What are the coefficients of static and kinetic friction between thecrate and the floor. (b) what push must you exert to give it an acceleration of 1.10 m/s2 ?arrow_forwardA freight train consists of two 8.00×104-kg enginesand 45 cars with average masses of 5.50×104kg . (a) What force must each engine exert backward on the track toaccelerate the train at a rate of 5.00×10–2 m/s2if the force of friction is 7.50×105 N , assuming the engines exertidentical forces? This is not a large frictional force for such amassive system. Rolling friction for trains is small, andconsequently trains are very energy-efficient transportationsystems. (b) What is the force in the coupling between the37th and 38th cars (this is the force each exerts on the other),assuming all cars have the same mass and that friction isevenly distributed among all of the cars and engines?arrow_forwardYou are trying to push your stalled car. Although you applya horizontal force of 400 N to the car, it doesn’t budge, andneither do you. Which force(s) must also have a magnitudeof 400 N?(a) The force exerted by the car on you.(b) The friction force exerted by the car on the road.(c) The normal force exerted by the road on you.(d) The friction force exerted by the road on you.arrow_forward
- During a road test, a driver breaks a 1420 kg car moving at 72 km/h [W]. The carslows down and comes to a stop after moving 100 m [W].(a) Calculate the net force acting on the car.(b) What is the force of friction acting on the car while it is slowing down? Explainyour reasoning.arrow_forwardA 20.0 kg trunk is pushed across the floor of a moving van by a horizontal force. If thecoefficient of kinetic friction between the trunk and the floor is 0.255, what is the magnitudeof the frictional force opposing the applied force?arrow_forwardA 0.85 kg block of wood is stationary on an incline that is15◦above horizontal. A force of 3.0 N is being applied toit 75◦below horizontal, directly into the incline (the force isperpendicular to the incline). What is the minimum coefficientof static friction required to keep the block stationary?arrow_forward
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