science-motion and forces

motion and forces booklet topic

distance/ time

how do you calculate speed

the speed of one object as perceived by another, meaning it's the rate at which the distance between two objects changes

what is relative speed

they are interactions: any force involves 2 objects. they are pushing or pulling on each other.

define forces

push, pull, gravity(weight), friction, magnetism, water resistance, upthrust, electrostatic.

name the forces

size, shape, direction

what can forces change

forces that act on both of the objects that are touching

contact force

a force that can act at a distance

non contact force

weight is the pull of the earth’s gravity on a mass

weight

the amount of matter in a body

mass

Newtons

weight is measured in

kilograms

mass is measured in

yes

does weight change on the moon?

no

does mass change on the moon?

weight= mass x gravity

how to calculate weight

its less dense

why do you float in salty water