Forces are responsible for all the interactions between particles and objects. They can be put into two categories: contact forces and non-contact forces. Forces can be added up as vectors.
What are contact forces?
Forces between similar objects
Forces between touching objects
Forces between objects that do not touch
Which of these is a non-contact force?
What is the unit of force?
Which of these is a contact force?
Which of these words describes the force between the north pole of a magnet and the south pole of another magnet?
Which of these words describes the force between two negatively charged particles?
What must an object have in order to be affected by electrostatic forces?
How is the object shown in a free body diagram? (Higher)
As a drawing of the object
As a written description of the object
As a box or a dot
In which way does an arrow point in a free body diagram? (Higher)
Towards the object
Away from the object
In the direction of movement
Two 30 N forces act on an object in opposite directions. Which statement is correct? (Higher)
The resultant force is: 30 + 30 = 60 N
The resultant force is: 30 - 30 = 0 N
The resultant force is: 2 × 30 = 60 N