Physics

Contact forces O' a b C Field forces M -9 + Q Iron N S d e (a) the spring exerts a force (b) the wagon exerts a force O to the right on the wall upward on the Earth due to gravitational attraction O upward on the Earth downward to the left on the handle O downward on the Earth upward to the left on the handle O to the right on the hand upward on the Earth due to contact to the left on the wall downward on the Earth due to contact to the left on the hand downward on the Earth due to gravitational attraction (c) the ball exerts a force (d) m exerts a force upward on the Earth to the left on M downward to the left on the player downward on M downward to the right on the player upward on M downward on the Earth to the right on M O upward to the right on the player