1. Where is gravitational force directed as you stand on the floor? A. upward C. backward B. forward D. downward 2. Which of the following shows the presence of friction? A. cars continuously roll down hills B. things fall off on smooth surfaces C. people stay in place as they move D. cars stop when the driver steps on the brakes 3. What is the direction of the frictional force that acts on an object moving to the left A. upward C. to the right B. downward D. to the left also 4. Which of the following statements is not true about friction? A.it acts upward opposing the pull of gravity B. it prevents things from sliding off surfaces C. it keeps things that are in contact with each other D. it holds objects that are separated by the great distance 5. A delivery man uses wooden ramp when he delivers thus, packages do not slide off easily making his work take longer. What would be the best way to make the packages slide easily? A make his wooden ramp wider B. use water on his wooden ramp C. use a sandpaper to polish and smoothen his ramp D. make his wooden ramp narrower​