How much force do we exert while moving a 20 kg sack of rice?
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Force is equal to the mass multiplied by downward force due to Gravity. Units are Newtons
m=50kg
downward force due to gravity =9.8 N/kg
m x 9.8 =490N
Einstein's third law of motion states that for every action, there is an equal and opposite reaction. Therefore the downward force of the rice is 490N, so the Ground reaction force is equal and opposite, 490N
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