Position and Motion #1
The starting point you choose to describe the location, or position, of an object.
Reference Point
The speed and direction of a moving object.
Velocity
A measure of the change in velocity during a period of time.
Acceleration
A simple model to understand systems of objects with any amount of applied forces.
Free Body Diagram
States that when an object applies a force on another object, the second object applies a force of the same strength on the first object, but the force is in the opposite direction.
Newton's Third Law of Motion
An object's distance and direction from a reference point.
Position
A quantity that has both magnitude and direction.
Vector
A push or pull on an object.
Force
The sum of all the forces acting on an object.
Net Force
The forces two objects apply to each other.
Force Pair
The process of changing position.
Motion
Average Speed Equation: v=d/t
A car travels a total distance of 200 miles in 5 hours. What is the average speed of the car?
40 mph
A push or pull on one object by another object that is touching it.
Contact Force
States that an object in motion will stay in motion, and an object at rest will stay at rest unless acted upon by a force.
Newton's First Law of Motion
A force that one object can apply to another object without touching it.
Non-Contact Force
The difference between the initial, or starting, position and the final position.
Displacement
How many times a day is a satellite orbiting the Earth?
48
States that the acceleration of an object equals the net force on the object divided by the object's mass.
Newton's Second Law of Motion
The gravitational force exerted on an object.
An attractive force that exists between all objects that have mass.
Gravity
A measure of the distance an object travels in a given amount of time.
Speed
Why is average speed the best way to describe a trip to the store?
Because the speed changes during a trip.
A force that resists the sliding motion of two surfaces that are touching.
Friction
Acceleration Equation: a=F/m
A toy train has a mass of 4 kilograms. A boy pushes the train with a net force of 20 Newtons. What is the acceleration of the toy train?
5 m/s^2
A region of space that has a physical quantity (such as force) at every point.
Field