Forces and speed Flashcards
what is a force
A force is a push or pull that causes a change in speed, direction or shape.
what is the formula for speed
d/t
what is the formula for distance
t x d
what is the formula for time
d/s
what is air resistance
A force on an object moving through air
what is a balanced force
Forces acting on an object that are the same size but act in different directions
if an object has a balanced force what is the object doing
it will be stationary or keep moving at a constant speed
what is a drag force
the force on an object moving through air or water that makes it slow down
what is a driving force
The force that is pushing or pulling something
what is gravity
A non contact force that acts between two masses
what is friction
The force that resists movement because of contact between surfaces
what is a mass
The amount of matter (stuff) a thing is made out of
what is a newton
a unit of force, symbol N
what is a kilogram
A unit of mass, symbol kg
what does it mean if a object is streamlined
Shaped to reduce resistance to motion from air of water
what is pull
a type of force
what is push
a type of force
what is a newton meter
A piece of equipment used to measure weight in newtons
if an object is unbalanced what does it mean
opposing forces on an object that are unequal
what is water resistance
the force on an object that causes it to slow down in water
what is weight
The force of the Earth on an object
upthrust
upward force experienced for an object immersed in water
density
the degree of compactness of a substance
What can we say about the forces on an object that is not moving
The forces must be balanced
A force of 4 N acts on a lever 2 m from the pivot. What is the moment
8N
What happens to the air resistance on a car as the car goes faster?
it increases
One way to increase the turning force on a spanner is to
Use a longer spanner
What store of energy does friction always produce
Heat
A force that makes things float
upthrust
density
mass of object/ volume of object
