18. Achild sits on a sled at the top of a hill, the hill makes an angle of 20° with the horizontal. The child's mass is 40kg. Use ps-.1 and 4-.03 a. b. Draw a free body diagram for this system. Does the child accelerate down the hill? *i.e., check that the coefficient of static friction is vercome by the component of the childs weight in the direction the child would accelerate. If they do, what is their acceleration? use coefficient of kinetic friction in sum of the forces balance if the child moves.

The same 2.0 kg box is then pulled up a 30° inclined surface, at constant velocity, by a 12.0Napplied force.Q1. Construct a free-body diagram for the box as it is pulled up the incline. Q2. Determine the magnitude of the kinetic friction force and the corresponding coefficient ofkinetic friction.

3. A block with mass m slides on the track as shown in TPP the figure. The track is frictionless. a) If the block realesed from point P, Find the net force on the block when it reaches point Q. b) Determine the height so that the force exerted on block y N will be equal its weight at point S (top of the circle) 5R R

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For the following problem, draw free-body diagrams and solve for the requested unknown. Use g = 9.8 m/s/s. A 22.6-N horizontal force is applied to a 0.0710-kg hockey puck to accelerate it across the ice from an initial rest position. Ignore friction and determine the final speed (in m/s) of the puck after being pushed for a time of .0721 seconds. PSYW

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A block is lifted using a pulley system as shown. The acceleration of the block is 3.0 m/s2 the applied force is 40 N. Find the mass mm of the block, assuming the pulleys are massless and frictionless.

question 4

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Draw a free body diagram of an object on a ramp and analyze the forces. Explain why the slope of the ramp can be used to determine the coefficient of friction. Use math to expalin your answer.