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Unit 8 Science Vocab
Question | Answer |
---|---|
Motion | an object's change in position relative to a reference point |
Frame of Reference | a system for specifying the precise location of objects in space and time |
Displacement | the change in position of an object |
Speed | the distance traveled divided by the time interval during which the motion occurred |
Velocity | the speed of an object in a particular direction |
Acceleration | the rate at which velocity changes over time; an object accelerates if its speed, direction, or both change |
Force | an action exerted on a body in order to change the body's state of rest or motion; force has magnitude and direction |
Friction | a force that opposes motion between two surfaces that are in contact |
Static Friction | the force that resist the initiation of sliding motion between two surfaces that are in contact and at rest |
Kinetic Friction | the force that opposes the movement of two surfaces that are in contact and are moving over each other |
Inertia | the tendency of an object to resist a change in motion unless an outside force acts on an object |
Weight | a measure of the gravitational force exerted on an object |
Free Fall | the motion of a body when only the force of gravity is acting on the body |
Terminal Velocity | the constant velocity of a falling object when the force of air resistance is equal in magnitude and opposite in direction to the force of gravity |
Projectile Motion | the curved path that an object follows when thrown, launched, or otherwise projected near the surface of Earth |
Momentum | a quantity defined as the product of the mass and velocity of an object |