# Force chapter 2

## 21 terms

### Air resistance

the fluid force experienced by objects falling through air

### Balanced forces

equal forces acting on an object in opposite directions

### Centripetal force

a force that causes an object to move in a circle

### fluid friction

friction that occurs as an object moves through a fluid

### force

a push or pull it exerted on an object

### free fall

the motion of falling object when the only force acting is there gravity

### friction

the force that one surface exerts on another when the two against each other

### gravity

the force that pulls an object towards each other

### inertia

the tendency of an object resist any change in motion

### law conservation of momentum

the rule that the total momentum of an object does not change

### mass

the amount of matter in one object

### momentum

the product of an object's mass and velocity

### net force

the overall force of an object when all the initial forces acting on an object are added together

### Newton

the unit and it of measurement that equals the force required to accelerate 1 kg of mass at 1 m/s squared

### Projectile

an object that is thrown

### rolling friction

friction that occurs when an object roles over a surface

### satellite

any object that travels around another object in space

### sliding friction

friction that occurs when one solid surfaces slides against another

### terminal velocity

the maximum velocity a falling object can achieve

### unbalanced forces

nonzero net force which changes an objects motion

### weight

force of gravity on an object at the surface of a planet