Force
What is a force
A push or pull in a particular direction
What are the two main types of force?
Contact and non-contact
What are balanced forces?
Equal forces in opposite direction
what is net force?
the total force acting on an object
What is friction?
Force when surfaces rub together
•Give an example of a push force.
Kicking a ball
name a contact force
Kicking a ball, dribbling..
What happens with balanced forces?
no movement/change
how do you calculate net force?
add/subtract forces
example of high friction surface
carpet
Give an example of a pull force
Pulling a rope in tug of war
name a non-contact force
gravity, magnetism, electrostatic
What are unbalanced forces?
One force is stronger than the other
net force is zero means?
example of low friction surface
Wooden Floor
what can a force do to an object?
move, stop, change speed/direction/shape
what is gravitational force?
pull of earth on objects
what happens with unbalanced forces?
causes movement/change
what does non-zero net force mean?
Unbalanced force; motion changes
what is friction useful?
slows/stops motion; gives grip
how can we show a force?
with arrows in a force diagram
What is magnetic force?
push or pull exerted by a magnet
example of unbalanced force in real life?
tug-of-war with one team stronger
example of net force?
2N right - 1N left = 1N right
how does friction affect a toy car?
slows it down depending on surface