REVIEW FORCE & MOTION

Mrs. Larm

RECOGNIZING MOTION Motion is when its distance from another

stationary object is changing

Using a reference point

Describing distance Measurement are in ____________________.

CALCULATING SPEED Formula is ______________________

Constant speed: same speed

Average speed: changing speeds total distance / total time

VELOCITY Velocity is speed and direction

Examples

GRAPHING MOTION Graphs (x,y)

Slope: y₂ - y₁/ x₂ - x₁

Slope intercept form: y = mx + b m= slope b = y intercept

x = linear line x ² = U shaped curved line (parabola)

SECTION 1 REVIEW Why do you need a reference point to

know if an object is moving? What is the difference between an

object’s speed and an object’s velocity? The bamboo plant grows 15 cm in 4

hours. At what average speed does the plant grow

GRAPH Times (s) Baby Sarah

distance (m) Baby Scott distance (m)

0 0 0

1 0.5 0.4

2 1 0.8

3 1.5 1.2

4 2 1.6

What is each baby’s speed?

CALCULATING DISTANCE Distance = speed x time

ACCELERATION Acceleration: increasing speed,

decreasing speed, or changing direction

Calculating acceleration: Acceleration= final velocity – initial velocity/

timeTime is squared m/s² An eagle accelerated from 15m/s to 22m/s in 4 seconds.

What is the eagles average acceleration?

GRAPHING ACCELERATION Linear means

Example

Nonlinear means Example

WHAT IS FORCE? Unbalanced force:

acting forces are unequal and will cause the object to move.

Balanced forces: All forces are equal and the object will not

change its motion or nonmotion

NEWTON’S FIRST LAW OF MOTION That an object at rest will remain at rest

and an object that is moving at a constant velocity will continue moving unless acted upon by an unbalanced force.

Inertia: is the tendency of an object to resist change in motion.

Mass: is the amount of matter in an object.

NEWTON’S SECOND LAW OF MOTION The net force on an object is equal to

the product of its acceleration and its mass

Force( newtons) = mass x acceleration

Acceleration = force / mass

NEWTON’S THIRD LAW OF MOTION States that if one object exerts a force

on another object, then the second object exerts a force of equal magnitude in the opposite direction on the first object

FRICTION Friction acts in the opposite direction of

motion Two factors:

Type of surface How hard the surfaces are push together

(weight)

MOMENTUM Momentum = mass x velocity

CONSERVATION OF MOMENTUM Two moving objects: transfer of speed

from the last object to the first object

One moving object: transfer of speed from a moving object to a stopped object which causes it to move a rate of the moving object

Two connected object: share the speed