# Chapter 10, 11

## 12 terms · Physics for MRs. Iby Intro to Physics Chapter 10 &11 Vocab words

### Rotation

when an object turns or spins about an internal axis

### Axis

A straight line about which a rotation takes place

### Revolution

a. Orbital motion about an external axis
b. A turning or rotational motion about an external axis.

### Linear Speed

distanced moved per unit time

### Tangential Speed

The speed of an object moving along a circular path

### Rotational Speed

the number of of rotations per unit time; often measured in rotations per minute or RPM

### Centripetal Force

A center directed force that causes an object to move in a curved or circular path

### Centrifugal Force

An apparent outward force on a rotating or revolving body. It is fictitious in the sense that it is not part of an interaction but due to the tendency of a moving body to move in a straight-line path(inertia).

### Center of Mass

The point at the center of an object's mass distribution, where all its mass can be considered to be concentrated. same as the center of gravity

### Center of Gravity

The point at the center of an object's mass distribution, where all its mass can be considered to be concentrated.Where the force of gravity can be considered to act.CG

### Torque

The product of force and lever arm (measured in Newton-meters N-m). Torque produces rotational acceleration

### Lever arm

The perpendicular distance between an axis and the line of action of a force that tends to produces rotation about that axis