ASTS 2 SIE GRADE 3

We can measure force using a ….

Force is measured in the unit ….

…. is a force created when a surface moves against another surface.

…. acts in the opposite direction of motion.

…. is created between the soles of our shoes and the ground when we walk.

…. is created between a ball and the ground when a ball rolls.

…. acts in the opposite direction of movement.

There is … friction created when a rough surface moves against a smooth surface.

There is … friction created when a rough surface moves against another rough surface.

Objects do not move easily over … surfaces.