# Download A sled of mass 46 kg is pulled along snowcovered, flat ground. The

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```A sled of mass 46 kg is pulled along snow­covered, flat ground. The static friction coefficient is 0.30, and the sliding friction coefficient is 0.10. (a) What does the sled weigh? 451N
(b) What force will be needed to start the sled moving? 135 N
(c) What force is needed to keep the sled moving at a constant velocity? 45.1 N
(d) Once moving, what total force must be applied to the sled to accelerate it 4.4 m/s2? 247 N
1
A force of 50 N accelerates a 6.0­kg block at 7.0 m/s2 along a horizontal surface. (a) How large is the frictional force? 8 N
(b) What is the coefficient of friction? 0.136
2
A freight train has a mass of 1.1 107 kg. If the locomotive can exert a constant pull of 7.3 105 N, how long does it take to increase the speed of the train from rest to 84 km/h? 5.86 min
3
A 194­kg crate is pushed horizontally with a force of 717 N. If the coefficient of friction is 0.20, calculate the acceleration of the crate. 1.74 m/s2 4
A 4 man bobsled weighs 2058 N. The start occurs over 50 M. The team
exerts 8332 N on the sled and the ice produces 100 N of friction.
a) What is the acceleration of the sled?
b) How fast is it traveling at the end of the start?
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