# PHY Ch 6: Motion in Two Dimensions

### 8 terms by kariathey

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### projectile

an object shot through the air, such as a football, that has independent vertical and horizontal motions and, after receiving an initial thrust, travels through the air only under the force of gravity

### trajectory

the path of a projectile through space

### uniform circular motion

the movement of an object or particle trajectory at a constant speed around a circle with a fixed radius

### centripetal acceleration

the center-seeking acceleration of an object moving in a circle at a constant speed

### centripetal force

the net force exerted toward the center of the circle that causes an object to have a centripetal acceleration

### Newton's 2nd Law for Rotational Motion

states that the angular acceleration of an object is directly proportional to the net torque and inversely proportional to the moment of inertia

### net force

the vector sum of all the forces on an object

### torque

a measure of how effectively a force causes rotation; is equal to the force times the lever arm

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