What does a marine fossil in a desert tell scientists?
a. marine fossil could not be found in the desert
b. the desert was always a desert
c. the area was once under water
d. marine life was once on land

James is trying to prove newton's 2nd law of motion. he tries to move four different objects with different masses, shapes, and sizes from point a to point b. the objects are a toy car, a car, a refrigerator, and a kitchen table. after some experimentation, he finds that force is dependent on the mass of the object, rather than it's size or shape. the object that takes the most force to move is the

There are two-speed cameras, one in an are where the speed limit is 30 km/h and another where the speed limit is 50 km/h. in which will there be a smaller time interval between the photographs? explain your answer.

What is the force that opposes motion and works against the downward pull? a) friction b) gravity c) weight d) acceleration