# science 1/7/11

## 54 terms

### slope is

the steepness of a line on a graph

### slope tells you...

how fast one variable changes in relation to the other (rate of change)

rise*run

### the steeper the slope...

the faster the movement of the object

constant speed

### horizontal line=

no speed or change in motion

### upward line=

movement away from the reference point

fast movement

### average speed is...

the general speed for the duration of the journey

distance/time

### instantaneous speed is...

the rate at which an object is moving at a given instant time

### velocity is...

the speed and direction that an object is moving

### velocity equation=

same as speed, but with a direction

### momentum is...

force put on an object

mass*velocity

momentum

momentum

m/s

### reference point

the point that tells you if you are in motion

### balanced forces are...

equal forces acting on an object in opposite directions

### when equal forces are exerted in opposite directions...

the net force is zero

### unbalanced forces are...

when force(s) are acting on an object and the net force is greater than zero

### when the net force is acting on on an object...

the forces are unbalanced

### net force is...

the combination of all forces on an object

### the net force determines whether an object...

moves and also which direction it moves

### when forces act in the same direction the net force can be found by...

adding the strengths of the individual forces

Newtons

a direction

friction

### static friction is...

the friction that acts on objects that are not moving

movement

### because of static friction, you must use extra force to...

start the motion of stationary objects

### sliding friction is...

when two solid surfaces slide over each other

### rolling friction is...

when an object rolls across a surface

wheels

rolling friction

### fluid friction is...

when a solid object moves through a fluid

sliding friction

### gravity is...

the downward force that acts on all objects

### the factors that affect gravity are...

mass, the amount of matter in an object, and distance

### gravity-

a downward force the affects all objects

### free fall-

when the force of gravity is an unbalanced force, which causes an object to accelerate

9.8 m/s squared

### air resistance-

a type of fluid friction experienced when objects fall

### air resistance pushes in a direction...

opposite of motion

air resistance

air resistance

### terminal velocity is...

the greatest velocity a falling object can reach when air resistance and gravity become equal

### weight is...

the measure of gravitational force exerted on an object

### mass is...

the measure of the amount of matter in an object

### inertia is...

any resistance to change in motion

### an object at rest will stay at rest and an object moving at a constant velocity will continue to move in a constant velocity unless acted on by an outside force

Newton's first law of motion

### to equally change the motion of two objects of different mass, more Force must be applied to the more massive object

Newton's second law of motion

### if one object applies a force on the second object, the second object applies the same size force is the opposite direction, and for the same amount of time on the first object

Newton's third law of motion