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-- When you step on the bathroom scale, (the force you read on the dial) equals

(your mass) times (the acceleration of gravity).

-- When you MASH the gas pedal, (the force that the tires exert against the pavement)

equals (the mass of the car) times (its acceleration as you leave the STOP sign).

-- When you let go of a helium balloon, the (buoyant force in air) minus (the balloon's weight)

equals (the balloon's mass) times (its upward acceleration).

-- When you crouch and then spring up, (the force of your leg muscles) minus (your weight)

equals (your mass) times (your upward acceleration).

As soon as your feet leave the floor, the (force of your leg muscles) becomes zero,

so the equation changes to

(zero) minus (your weight) equals (your mass) times (your upward acceleration)

Multiply each side of this equation by -1 :

(your weight) equals (your mass) times (your downwardacceleration)

That's exactly the same as the bathroom-scale example up at the top of this answer.

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12y ago

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Explain how a football and a soccerball can have different accelerations if pushed by the same force?

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