A student sets up the experiment shown in the diagram to the right to investigate how friction
affects the motion of a toy car. The student releases the car down the ramp
and measures how far the car travels. Which
variable must the student change to test how
friction affects the motion of the car?

the maxium height is 34m/s

according to jean piaget, in what stage of cognitive development are children able to understand conservation task?

b. preoperational

just took it

radial fractures in a piece of glass look most like which of the following?

a. spokes of a wheel

b. a circle

c. a zig zag

d. none of the above

the correct answer is a. spokes of a wheel

hope this (: