Copy - Friction with Prediction Lab (Physics Aviary) Static Dyn - 9779662

Which of the following is TRUE about the friction force between two surfaces? Mark only one. The surfaces must be in contact with each other in order to have friction. The surfaces must be moving against each other in order to have friction. O The magnitude of the friction force depends on the types of materials present, the force of contact between them, and the surface area of the objects. The magnitude of the friction force increases as the relative speed of the objects increases

Which of the following statements is true about friction? k and us are independent on the mass of the object. The coefficients of friction are independent on the nature of the surfaces. Hk is greater than us Static friction is relatively constant while kinetic friction is not. The force of static friction depends on the area of contact between the two surfaces.

If the kinetic friction coefficient is known, what can we infer about static friction coefficient? Select one: а. The coefficient of static friction is equal than the coefficient of kinetic friction. b. No conclusions can be made С. The coefficient of static friction is smaller than the coefficient of kinetic friction. d. The coefficient of static friction is larger than the coefficient of kinetic friction.

A 5.00-kg box is initially at rest on a level surface. The coefficient of static friction between the box and the surface is 0.400. Let g=10m/s/s​, and all answers be in newtons.  a) Calculate the maximum force you can apply before the box starts to move, if the force is directed at an angle of 30 degrees from the horizontal, with the vertical component downward._______ N  answer: 30N (solve step by step)   b) Calculate the maximum force you can apply before the box starts to move, if the force is directed at an angle of 30 degrees from the horizontal, with the vertical component upward._______ N (answer: 18.7, solve step by step)

The coefficient μ of kinetic frictions depends on the surfaces in contact and their conditions, while the coefficient μ of static frictions does not depend on the surfaces conditions. a) Trueb) False

A student wants to determine the coefficient of static friction between a long, flat wood board and a small wood block. (a) Describe an experiment for determining the coefficient of static friction between the wood board and the wood block. Assume equipment usually found in a school physics laboratory is available. i. Draw a diagram of the experimental setup of the board and block. In your diagram, indicate each quantity that would be measured and draw or state what equipment would be used to measure each quantity. ii. Describe the overall procedure to be used, including any steps necessary to reduce experimental uncertainty. Give enough detail so that another student could replicate the experiment. (b) Derive an equation for the coefficient of static friction in terms of quantities measured in the procedure from part (a). A physics class consisting of six lab groups wants to test the hypothesis that the coefficient of static friction between the board and the block equals the…

IP A gardener mows a lawn with an old-fashioned push mower. The handle of the mower makes an angle of 39 ° with the surface of the lawn. Part A If a 90.0-N force is applied along the handle of the 17-kg mower, what is the normal force exerted by the lawn on the mower? Express your answer using two significant figures. Π ΑΣφ N = N Submit Request Answer Part B If the angle between the surface of the lawn and the handle of the mower is increased, does the normal force exerted by the lawn increase, decrease, or stay the same? O Increases O Decreases O Stays the same Submit Request Answer

A block is being pulled up an inclined plane by a force with magnitude F=45.0 N as shown In the figure above. The block has a mass of m =1.35 kg. The coefficient of kinetic friction between the block an the surface of the incline plane is µ = 0.287. The inclined plane makes an angle \theta= 31.7 degrees with respect to the horizontal. What is the magnitude of the acceleration of the mass?

A 50-kg box is resting on a horizontal floor. A force of 250 N directed at an angle of 30.0 degrees below the horizontal is applied to the box. The coefficients of static friction between the box and the surface is 0.40, and the coefficient of kinetic friction is 0.30. What is the force of friction on the box? Draw force diagram. Please provide step-by-step solution

A block weighing 60 N rests on a horizontal floor. a) What is the minimum force that will make the block move if the coefficient of static friction is 0.20? b) What is the minimum force that will keep the block moving at uniform speed once it starts moving if the coefficient of kinetic friction is 0.10?   please include clear solutions please.

A 6 kg piece of wood is locked at rest on a given horizontal surface. a. Draw all forces acting on the wood, and calculate the magnitude of each force if µs = 0.6

Problem: Pushing a Block on a frictional surface Description: Simple quantitative and qualitative questions about kinetic and static friction. A block of mass 10 kg lies on a horizontal table. The coefficient of static friction between the block and the table is 0.50 and the coefficient of kinetic friction is 0.40. (a) If the block is at rest (and the only forces acting on the block are the force due to gravity and the normal force from the table), what is the magnitude of the force due to friction? (b) Suppose you want to move the block, but you want to push it with the least horizontal force possible to get it moving. With what horizontal force F must you be pushing the block just before the block begins to move? (c) Suppose you push horizontally with half the force needed to just make the block move. What is the magnitude of the friction force? (d) Suppose you push horizontally with precisely enough force to make the block start to move, and you continue to apply the same amount of…

Of the following statements, indicate on the line whether they are true (T) or false (F):___ The friction between two surfaces can be changed by changing the masses of the objects.___ The coefficient of static friction can be less than the coefficient of kinematic friction.___ When the force of friction increases, the coefficient of friction decreases.___ The only way to change the friction between two objects is by changing their masses.___ The only way to change the friction between two objects is to polish their surfaces.___ The only way to change the friction between two objects is by changing their materials.___ The value of the friction force of a body is always constant when it is staticand does not vary with the applied force.___ When a ball strikes outside the center of gravity of a baseball bat, the ball will travelfurther than if it hit the center of gravity.___ The center of gravity of a body may be outside of it.___ The center of gravity of an object depends only on the…

A box with mass m = 2.75 kg rests on the top of a table. The coefficient of static friction between the box and the table is μs = 0.71 and the coefficient of kinetic friction is μk =0.34 Write an expression for Fm the minimum force required to produce movement of the box on the top of the table.  Solve numerically for the magnitude of the force Fm in Newtons. Write an expression for a, the box's acceleration, after it begins moving. (Assume the minimum force, Fm, continues to be applied.) Solve numerically for the acceleration, a in m/s2.

15 A81 kg skydiver can be modeled as a rectangular "box" with dimensions 18 cm x 35 cm x 180 cm. If he falls feet first, his drag coefficient is 0.80. Part A What is his terminal speed if he falls feet first? Use p = 1.2 kg/m³ for the density of air at room temperature. Express your answer with the appropriate units. Value Units Submit Request Answer

D. 100 kg container with water; Weight= _____ N;friction = _______ N E. 200 kg Refrigerator: Weight = _____ N;friction = _________ N With the values that you get using the Phet simulation software, what is the factor that affects static friction? Justify your answer. _______________

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A stockroom worker pushes a box with mass 11.6 kg on a horizontal surface with a constant speed of 3.40 m/s. The coefficient of kinetic Part A friction between the box and the surface is 0.21. What horizontal force must the worker apply to maintain the motion? Express your answer with the appropriate units. HA ? F = Value Units Submit Request Answer

What is the μs of friction on the tires/road

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A force F-> acts on a block of mass M, holding it against a vertical wall without the block moving, as shown in the figure. g-> is the gravitational acceleration at the location.   l) The friction force between the block and the wall has magnitude M*g and points to the right. ll) The friction force between the block and the wall points to the right and has magnitude μeF, where μe is the coefficient of static friction between the block and the wall. lll) The friction force between the block and the wall points upwards and has magnitude μeF, where μe is the coefficient of static friction between the block and the wall. IV) The friction force between the block and the wall is zero. V) The friction force between the block and the wall points downwards and has magnitude μeMg, where μe is the coefficient of static friction between the block and the wall. Vl) The friction force between the block and the wall points to the right and has magnitude μeMg, where μe is the coefficient of…