| A | B |
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| The change in position of one object compared to the position of another is referred to as | relative motion |
| When you hit a tennis ball with a racket, you apply a | force |
| When forces are balanced meaning equal forces are acting in opposite directions, this is referred to as | balance forces |
| When equal forces act in opposite directions, it is called | balance forces |
| Another name for pushing or pulling is | force |
| The force of attraction that exists between any two objects is referred to as | gravity |
| No matter how hard a person hits a ball, it will always fall back to Earth. This is because of what? | gravity |
| The pull of gravity between any two objects depends on the amount of matter or ? that each object has | mass |
| A measure of the pull of gravity on an object's mass is called | weight |
| The combination of all the forces acting on an object is referred to as | net force |
| The change in position of one object compared to the position of another is referred to as | relative motion |
| The object an observer uses to detect motion is referred to as | frame of reference |
| The distance an object moves in a certain period of time is referred to as | speed |
| The speed at any given point is called | instantaneous speed |
| This is a device that shows instantaneous speed | speedometer |
| A measure of both the speed and direction of a moving object is referred to as | velocity |
| When people say that they run at a speed of 10 kilometers an hours, they are referring to their | average speed |
| If you want to describe both the speed and direction of travel, you refer to a moving object's | velocity |
| A change in speed or direction causes a change in what? | velocity |
| The change in velocity during a particular time period is referred to as | acceleration |
| This tells the rate at which velocity is changed | acceleration |
| The resistance of an object to change in its state of motion is referred to as | inertia |
| A force between surfaces that resists the movement of one surface past the other is referred to as | friction |
| The friction from air molecules hitting an object as the object moves through the air is called | air resistance |
