FORCES Flashcards
Name two contact forces
Air resistance and friction
Name two non contact forces
Weight and magnetic force
Name three things a force can change about an object
Speed,size,shape
What do you measure forces in?
Newtons
Define a contact force
When two objects are physically touching
Define a non contact force
When two objects are not physically touching
What do you use to measure force
Newtonmeter
What does the force arrow represent
The size and direction of
The direction of the arrow represents..
Direction of force
The length of the arrow represents..
The size of the force
What is a resultant force?
A single force object that can replace all the forces acting on an object and have the same effect
How do you find out the resultant force
Add or subtract all the forces acting on the object taking account of their direction
Define equilibrium
When the forces are balenced
What happens when all forces are equilibrium
The object will stay stationary or stay the same speed
What can happen if the forces are unbalanced?
The object will change direction and/or shape
a car has a driving force of 200N. There is a 125 friction force also acting on the car. Calculate the rise sultans force
75N
Define friction
Surfaces which act to resist movement between them
How does friction work?
There are tiny bumps which you cannot see on objects. the bumps of each surface push against each other when you are sliding the box
What can help reduce friction
Lubricant
How does lubricant help?
It allows objects to move past eachother more easily
