3. A 12-kg child sits on a 5-kg sled that slides with friction across level ground. The child's two siblings attach ropes to the sled and pull in opposite directions: one pulls forward with a force of 75 N, and the other pulls backward with a force of 88 N. If the sled nevertheless does not move: (a) what friction force is present, and in what direction is it? (b) what is the normal force acting upward on the child from the sled? (c) what is the normal force acting upward on the sled from the ground?
3. A 12-kg child sits on a 5-kg sled that slides with friction across level ground. The child's two siblings attach ropes to the sled and pull in opposite directions: one pulls forward with a force of 75 N, and the other pulls backward with a force of 88 N. If the sled nevertheless does not move: (a) what friction force is present, and in what direction is it? (b) what is the normal force acting upward on the child from the sled? (c) what is the normal force acting upward on the sled from the ground?
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Transcribed Image Text:3. A 12-kg child sits on a 5-kg sled that slides with friction across level ground. The child's
two siblings attach ropes to the sled and pull in opposite directions: one pulls forward with a
force of 75 N, and the other pulls backward with a force of 88 N. If the sled nevertheless
does not move:
(a) what friction force is present, and in what direction is it?
(b) what is the normal force acting upward on the child from the sled?
(c) what is the normal force acting upward on the sled from the ground?
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