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Title: GSCE Physics O level notes
Description: Chapter 3 Notes Dynamics It includes the topic such as force, net force, vector diagram, all three Newtons law and friction.
Description: Chapter 3 Notes Dynamics It includes the topic such as force, net force, vector diagram, all three Newtons law and friction.
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Chapter 3 Notes
Dynamics
_____
Dynamics
- The study of how objects move and the relationship of this motion to
physical concepts e
...
force, mass
Force
● A force is something capable of changing an object’s state of motion
Contact Force
physical contact between 2 objects
Frictional Force
Field Forces (non-contact forces)
- between 2 disconnected objects
Magnetic Force
Only occurs when there is a capability for
something to move
Normal force
Electrical Force
Must always be perpendicular to surface
Spring force
Tensional force
Air resistance force
Applied force
Gravitational Force
Chapter 3: Dynamics
Free Body Diagrams
Addition of Vectors
● When a number of forces act on an object, we can replace these forces
with a single force → NET/RESULTANT force
Vector Diagrams
2 methods:
●
PParallelogram
a ra lle log ra m Method
m e thod
●
TTriangle
ria ng le Method
me thod
2
Chapter 3: Dynamics
Net force
When net force is…
●
Zero
Forces of equal magnitude act in opposite direction
○ referred to as balanced forces
○
○ Combined effect of all the forces is zero, does not mean that there
are no forces acting on an object
●
Non-zero
○ Forces of unequal magnitude act in different direction
○ referred to as unbalanced forces
Newton’s 1st Law (Balanced Forces)
● An object will remain at rest OR continue to move at a constant velocity
if there is no resultant force acting on it
● Implies that matter has a built-in reluctance to change its state of
rest/motion → INERTIA
○ The mass of a body is a measure of its inertia
...
Newton’s 2nd Law (Unbalanced Forces)
● The acceleration of a body is proportional to the net force acting on it
and occurs in the direction of the force
Title: GSCE Physics O level notes
Description: Chapter 3 Notes Dynamics It includes the topic such as force, net force, vector diagram, all three Newtons law and friction.
Description: Chapter 3 Notes Dynamics It includes the topic such as force, net force, vector diagram, all three Newtons law and friction.