Exp. 1 Steel ball falling through water and through glycerol The thicker the liquid an object moves through, the ____ the friction and the ____ it goes. Exp. 2 Balloon Slider The slider went ____ along the bench with the balloon attached. This is because it slid on a layer of ____ which ____ the amount of friction. Exp. 3 Block with rollers and without rollers Putting rollers under an object ____ the amount of friction between it and the bench and therefore ____ the force needed to move it. Exp 4. Hinge with oil and hinge without oil Oil is a ‘slippery’ liquid. The oiled hinge needed a ____ force to open it because the oil had ____ the friction between the moving parts. Exp 5. Shape of the moving object (parachute) Notes: The ball with the loose hankie went ____ than the rolled up hankie as it fell through the ____. This was because it had a bigger surface area and therefore more air ____.

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