Question

a 60 kg block weighs 132 lb on earth. if the block were transported to a planetary body that had a bigger free fall acceleration (as compared to earth), which one of the following would be true?
o the block would have a smaller mass & same weight.
o the block would have a smaller mass & a bigger weight.
o the block would have a bigger mass & the same weight.
o the block would have the same mass & a bigger weight.
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1. -/2 points

a hockey puck is observed to be sliding along a flat frictionless surface at a speed of 41 mm/s. there is no net force acting on the puck. assuming it doesnt smash into anything, how fast will the puck be going 2 h later?
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Explanation:

Step1: Recall the concept of mass and weight

Mass is an intrinsic property of an object and does not change with location. Weight \(W = mg\), where \(m\) is mass and \(g\) is the acceleration due to gravity.

Step2: Analyze the effect of \(g\) on weight

Given \(m = 60\space kg\) (constant). If \(g\) (on the new planetary body) \(>g_{Earth}\), then \(W=mg\) (on the new body) \(>W_{Earth}\) (since \(m\) is constant and \(g\) is larger).

Step3: Recall Newton's first law

Newton's first law states that an object in motion will remain in motion with a constant velocity if there is no net force acting on it. The initial velocity of the puck \(v = 41\space mm/s\), and since \(F_{net}=0\), the acceleration \(a = 0\). Using the equation \(v = v_0+at\), with \(a = 0\), \(v=v_0\) at any time \(t\).

Answer:

For the first question: The block would have the same mass & a bigger weight.
For the second question: \(41\space mm/s\)