# 5-Newton's Laws (IPC)

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mass and force

### Newton's Second Law

connects force, mass and acceleration

### friction

force that opposes motion when two surfaces touch

### microwelds

where surfaces bump together

### static friction

occurs between surfaces that are not moving

### sliding friction

occurs between surfaces that are moving

### rolling friction

between a rolling object and the surface

### air resistance

opposes the force of gravity

### terminal velocity

object falls at constant speed

### gravitation

two objects exert an attractive force on each other

### gravity

long-range force that gives the universe its structure

### same

all objects fall at the ________ acceleration regardless of mass

### weight

gravitational force on an object

### decreases

weight ___________ as an object moves away from Earth

### projectile

horizontal and vertical velocity, follows a curved path

### centripetal acceleration

acceleration toward the center of a curved path

### Newton's Third Law

for every action there is an equal and opposite reaction

### rocket propulsion

based on Newton's third law

### momentum

related to how much force it takes to move an object

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