Calculate the magnitude of force needed to keep a 200 gm hockey puck moving at a constant speed of 5 m/s on frictionless ice ?

zero

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0.1 N

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0.5 N

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5 N

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50 N

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Solution

The correct option is A zero
Hockey moves with a constant speed, thus change in kinetic energy is zero i.e $Δ K . E = 0$
Work done $W = F S$
Using work-energy theorem, $W = Δ K . E$
$∴$ $F S = 0$ $⟹ F = 0$ N

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Calculate the magnitude of force needed to keep a 200 gm hockey puck moving at a constant speed of 5 m/s on frictionless ice ?

The correct option is A zeroHockey moves with a constant speed, thus change in kinetic energy is zero i.e ΔK.E=0Work done W=FSUsing work-energy theorem, W=ΔK.E∴ FS=0 ⟹F=0 N

The correct option is A zero
Hockey moves with a constant speed, thus change in kinetic energy is zero i.e $Δ K . E = 0$
Work done $W = F S$
Using work-energy theorem, $W = Δ K . E$
$∴$ $F S = 0$ $⟹ F = 0$ N