# FPC Forces & Motion - Ch 12

### 20 terms by mbrazo

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### force

a push or pull that acts on an object

### newton

the force that causes a 1-kilogram mass to accelerate at a rate of 1 meter per second each second

### net force

the overall force acting on an object after all forces are combined

### friction

a force that opposes the motion of objects that touch as they move past each other

### static friction

the friction force that acts on objects that are not moving

### rolling friction

the friction force that acts on rolling objects

### fluid friction

the friction force that opposes the motion of an object through a fluid

### gravity

the force that acts between any two masses

### terminal velocity

the constant velocity of a falling object when the force of air resistance equals the force of gravity

### projectile motion

the motion of a falling object after it is given an initial forward velocity

### inertia

the tendency of an object to resist a change in motion

### mass

the amount of matter an object contains

### weight

the measure of the force of gravity on an object

### momentum

the product of an object's mass and velocity

### law of conservation of momentum

the total momentum of a closed system does not change

### electromagnetic force

a force associated with charged particles, which has two aspects, electric force and magnetic force

### strong nuclear force

a powerful force of attraction that acts only on the neutrons and protons in the nucleus, holding them together

### weak nuclear force

a powerful attractive force that acts over a short range

### gravitational force

an attractive force that acts between any two masses

### centripetal force

a center-directed force that continuously changes the direction of an object to make it move in a circle

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