4.5.1 Forces and their interactions

You will need to use a combination of the materials we have collected here to enable you to succeed. The most important factor will always be your effort. Use the knowledge of your teacher, attend revision sessions, ask when you need help. Most importantly of all, stay confident! You can do this!

Learning Checklist & Knowledge Organisers

4.5.1 Forces and their interactions

Identify and describe scalar quantities and vector quantities
Identify and give examples of forces as contact or non-contact forces
Describe the interaction between two objects and the force produced on each as a vector
Describe weight and explain that its magnitude at a point depends on the gravitational field strength
Calculate weight by recalling and using the equation: [ W = mg ]
Represent the weight of an object as acting at a single point which is referred to as the object's ‘centre of mass’
Calculate the resultant of two forces that act in a straight line
Describe examples of the forces acting on an isolated object or system
Use free body diagrams to qualitatively describe examples where several forces act on an object and explain how that leads to a single resultant force or no force
Use free body diagrams and accurate vector diagrams to scale, to resolve multiple forces and show magnitude and direction of the resultant
Use vector diagrams to illustrate resolution of forces, equilibrium situations and determine the resultant of two forces, to include both magnitude and direction