unit 4

Distance

the length of the route between two points.

speed

It is a measure of how fast or slow something moves

velocity

The measure of both speed and direction

average speed

the total distance traveled divided by the total time it took to travel that distance.

difference between speed anv velocity

speed does not include direction and velocity does

acceleration

a measure of the change in velocity of a moving object.

force

a push or a pull acting on an object.

3 examples of force

Pushing a stroller

pedaling a bike

gravity pulling you

unit for force

newton

what does friction produce

heat

what is friction

a force that opposes motion between two surfaces that are touching

gravity

a pull twoard the center of the planet

Unit for weight

kilogram

what factors impact gravity?

Objects with greater mass have a stronger force of gravity

Objects that are closer together have a stronger force of gravity

acceleration due to gravity

9\.8 m/s2

newton 1 law

an object at rest will remain at rest and an object in motion will stay in motion unless it is acted on by an unbalanced force

inertia

the tendency of an object to resist a change in its motion

How do we change the motion of an object?

acting on it with an unbalanced force

newton 2 law

the acceleration of an object equals the net force acting on the object divided by the object’s mass

What is the relationship between force and acceleration?

the greater the force that is applied to an object of a given mass, the more the object will accelerate.

What is the relationship between mass and acceleration?

The greater the mass of an object, the less it will accelerate when a given force is applied.

newton 3 law

every action has an equal and opposite reaction