solve problems involving force due to gravity (weight) and mass using the mathematical relationship between them calculate the net force acting on an object on an inclined plane through vector analysis.
- A force is a push or pull between objects, which may cause one or both objects to change speed and/or the direction of their motion or change their shape
- Weight is a measure of the force of gravity acting on an object (N)
- Mass is an object's resistance to a change in motion (kg)
Define the term normal race
- Normal force is the force acting along an imaginary line drawn perpendicular to the surface
○ Referred to as FN
- When looking at the box on a table, the following forces exist:
describe and represent the forces acting on an object on an inclined plane through the use of free-body diagrams
- Friction is the resistance to the motion of a surface moving relative to another
○ Result of electromagnetic attraction between charged particles in two touching surfaces
Properties of friction
- Friction is the force between two surfaces and it opposes motion
- Friction has the symbol Ff and is measured in newtons
- With no acceleration, frictional force = horizontal force
- Tension is the pulling force transmitted along a rope, string, cable or chain on an object
Applied Force
- Applied force is the force applied to an object by a person or another object
Forces applied horizontally
- Forces applied horizontally have no effect on the normal force of the object on the floor
Forces applied at an angle
Syllabus link: Students should be able to define Newton's three laws of motion and describe examples of each (Unit 2 Topic 1: Linear motion and force)
Newton's First Law states that an object maintains its state of rest or constant velocity motion unless it is acted on by an external unbalanced force
- An object that is at rest, stays at rest
- An object that is in motion, stays in motion
- If there are balanced forces acting on an object, there is constant velocity
Newton's Second Law states that the acceleration of an object is in the direction of the net external force acting on it and is proportional to the size of the force and inversely proportional to the mass
Newton's Third Law states that forces always occur in equal and opposite pairs
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