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Forces and Motion
Newton's Laws, Forces and Motion
49
Science
9th Grade
02/23/2015

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Term
Velocity
Definition
The distance an object travels per unit of time and the direction in which it moves.
Term
acceleration
Definition
The rate of change of velocity
Term
Force
Definition
A push or a pull
Term
Newton
Definition
SI unit of force
Term
Balanced force
Definition

Forces on an object that are equal in size and opposite in direction.

Term
net force
Definition
The sum of two or more forces-  the overall force.
Term
Inertia
Definition
The tendency of an object to resist change in its motion.
Term
Newton's First Law
Definition
An object moving at a constant velocity keeps moving at that velocity unless acted upon by an unbalanced force.
Term
Real-life example of Newton's First Law
Definition
The use of seat belts to reduce injury.
Term
Changes of speed or direction result in this.
Definition
acceleration
Term
reference point
Definition
Used to determine an object's position
Term
Walking with a constant speed away from the sensor.
Definition
Line that is linear and positive on a position-time graph.
Term
Horizontal line on a position-time graph
Definition
No movement (no change in position).
Term
Newton's Second Law
Definition

The acceleration of an object is in the same direction as the net force on the object.

Term
F=ma
Definition
Newton's Second Law
Term
Friction
Definition

The force that opposes the sliding motion of two surfaces that are touching each other.

Term
microwelds
Definition

The dips and bumps on the surface of objects smooth or rough which cause friction.

Term
Static Friction
Definition

The force which must be overcome before an object can move.

Term
Sliding friction
Definition
Results when two surfaces are moving past each other.  Also called kinetic.
Term
Air Resistance
Definition
A friction-like force which opposes falling objects.
Term
Depends on speed, size and shape of an object
Definition
Air resistance
Term
Terminal velocity
Definition

The force of air resistance is equal to the force of gravity of a falling object.

Term
Gravity
Definition
The attractive force between any two objects
Term
Depends on the distance apart and mass of two objects
Definition
Gravity
Term
Weight
Definition
The gravitational force exerted on an object
Term
Newton's Third Law of Motion
Definition
For every action, there is an equal but opposite reaction
Term
An example of Newton's Third Law
Definition
Letting go of a balloon
Term
An example of Newton's Second Law
Definition

It takes 50N of force to accelerate a 1000Kg car to .05m/s2

Term
Motion
Definition

A change in an object's position determined by using reference point

Term
Velocity
Definition
The speed and direction of an object
Term
Newton's First Law of Motion
Definition
An object not being subjected by a force will continue to move at a constant speed in a straight line or stay at rest.
Term
Balanced Force
Definition
Having a net force of zero
Term
Gravitational Force
Definition
Everything on or around the Earth is pulled towards Earth's center.
Term
The cause of an acceleration
Definition
Unbalanced force
Term
speed
Definition
Distance per unit of time
Term
Displacement
Definition
The location of an object as measured from its starting point.
Term
Distance
Definition
A measurement of how far an object has moved.
Term
Describes an object which is moving without accelerating. Forces are balanced.
Definition
Constant Velocity
Term
Net Force
Definition
The sum of all forces acting on an object.
Term
Inertia
Definition
The property of an object to resist change in its motion.
Term
Force
Definition
A push or a pull. Measured in Newtons.
Term
Acceleration
Definition
The rate at which velocity changes with time.
Term
Friction
Definition
A resistive force which opposes motion.
Term
Mass
Definition
The amount of matter in an object. Measured in grams or Kilograms.
Term
Weight
Definition
The force upon an object due to gravity (mass X gravity). Measured in Newtons
Term
F=m x a
Definition
Newton's Second Law.
Term
Newton's Second Law
Definition
The acceleration of an object is directly proportional to the net force acting on the object and inversely proportional to the object's mass.
Term
Newton's Third Law of Motion
Definition
Whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first.
Term
Terminal Velocity
Definition
The speed at which a falling object has no net force because the gravitational force pulling down is equal to but opposite the force of air resistance pushing up on the object.
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