why objects make sound , due to vibration , due to jumping , by singers , by instruments , if we stretch the piece of elastic tighter and plucks it harder the sound will be ......, louder and higher pitched , lower pitched , quieter , noisy , if we replaced the elastic with a thicker piece the sound will be ......., lower pitched , higher pitched , if you hit the gong hard the sound will be ......., louder , quieter , if you hit the gong with less force the sound will be ......., louder , quieter, loud and quiet describe the ............of a sound , volume , pitch , high, low , high and low describe the .........of sound , volume , pitch , the least air resistance acts on the parachute made from ......., plastic , paper , cotton , nylon , gravity acts on the parachute in the ............direction of movement , same , opposite , air resistance acts on the parachute in the ............direction of movement , same , opposite , if we use larger nylon parachute how much time it will take to land , more than 2.1 , less than 2.1 , what is force X , gravity , upthrust , what is force Y, gravity , upthrust , what happens if force Y is more than X , boat will not be affected , boat will sink , if we change the height of the ramp to check the force needed to move an object on the ramp, what is the independent variable  , the height of the ramp, the force needed, the ramp, the object on the ramp, what is the pattern in this investigation , force increases with increasing height , force decreases , height only change , no pattern , if we draw the table pattern on a graph x axis will be .......and y axis will be ......, x: height and Y : force , y: height and X : force.

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