# Science Chapter 10

## 28 terms

push or a pull

direction

force

### the net force is

the combonation of all forces acting on an object

### when 2 forces act in opposite directions they combine by

producing a net force

### unbalanced forces can cause an object to start moving, (2 more)

stop moving, or change in its direction

### balanced forces acting on an object do not

change the objects motion

### friction is

a force caused by 2 surfaces in contact that opposes motion

### the strength of the force of friction depends on

two factors. how hard the surfaces push together, and the types of surfaces involved

motion

### the 4 types of friction are..:

-Static friction, sliding friction, rolling friction, and fluid friction.

### gravity is a force that

pulls objects towards eachother

### the law of universal gravitation states that

the force of gravity acts between all objects in the universe

### two factors that affect the gravitational attraction between objects are

mass and distance

### the more mass and object has the greater

gravitational force

gravitational

### free fall is when

the only force acting on an object is gravity

fluid

velocity

### terminal velocity is reached when

the force of air resistance equals the weight of an object

### inertia is

the tendency of an object to resist the change in motion::a object in motion stays in motion, an object in rest stays at rest

inertia

### Newtons first law:

that an object at rest will remain at res, and an object moving with continue moving at a constant velocity.

### Newtons second law:

acceleration depends on the objects mass and on the netforce acting on the object

### Newtons third law:

if one object exerts a force on another object, then the second object exerts a force of equal strength and opposite in direction on the first object

### two ways to increase acceleration is

to increase the force or decrease the mass

### momentum is

a characteristic of a moving object that is related to the mass and velocity of the object

mass | velocity