forces and speed Flashcards
(20 cards)
What is the formula for speed
distance divided by time (d/t)
What force helps you float
upthrust
How do you reduce friction
Streamlining, lubricating
What force slows you down (in the air)
air resistance
How dense does an object have to be to float on a liquid
Less dense than the liquid
What is the formula for density
mass divided by volume (m/v)
Which 2 forces act to pull us down
weight, gravity
What is weight measured in
N (newtons)
What is mass measured in
K (kilograms)
What is the formula for weight
Mass times gravitational field strength (mXg)
Can an object with no forces acting against it move.
Yes
What is a vector quantity
A quantity with a size and direction
What is a force
A push or a pull
What is the difference between a driving force and a drag force
a driving force pushes or pulls an object and a drag force slows or stops an object’s motion
What do you use to measure newtons
A newton meter
What does it mean to lubricate
It means you make something smoother or more greasy so that it has less friction
What does it mean to streamline
To make an object have less friction by making the object have a sharper shape with no protrusions
What is a resistive force
A force that acts to slow down a moving object
What does friction do
It opposes motion
What is a reaction
The force provided by a solid surface like a wall or floor
