1) what is motion? a) it is a change of positionof position in the upward direction b) it is a change in position in any direction. c) it is a change in the circle position 2) what is gravity? a) a force that pulls objects to the ground b) a push that makes things go up. c) a light that reflects in water. 3) what is friction? a) A force that slows down or stops motion when two surfaces rub together b) A force that pushes objects to move faster. c) A force that pulls objects toward the center of the Earth. 4) a push or a pull that causes a change in motion of an object, so that the object moves is called a.... a) energy b) speed c) force. 5) The rate at which an object travels a certain distance in a certain amount of time is called… a) gravity b) speed. c) friction 6) A substance, such as oil, that is put on surfaces so they move easily and smoothly is called a… a) lubricant. b) surface. c) friction. 7) An object that is not moving and stays in the same place is called a… a) moving object b) fast object.  c) stationary object 8) it is the friction between a stationary object and the surface on which it is resting:  a) kinetic friction b) static friction 9) it is the friction between a moving object and the moving surface:  a) kinetic friction b) static friction  10) When you drop a ball, why does it fall to the ground? a) Air pushes it down. b) Friction moves it. c) Gravity pulls it 11) Light is something you can … a) taste b) see c) hear  12) Light travels in straight lines. a) true b) false 13) Light can travel through transparent materials, like glass, air, and water. a) true b) false  14) Light can pass through opaque objects, such as walls, trees, or you. a) true b) false

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