NEWTON'S LAWS OF MOTION
1.1 KEYWORDS
Acceleration- rate of change of velocity.
Kinetic Frictional Force- the force acting parallel to a surface that opposes the motion of a
moving object relative to the surface.
Mass- the measure or amount of matter in an object.
Static Frictional Force- the Force that acts parallel to a surface and opposes the tendency of
motion of a stationery object relative to the surface.
Normal Force- the perpendicular force that a surface exerts on an object that it is in contact
with.
Weight- the gravitational force exerted on an object.
Inertia- the resistance of a body to change in its state of rest or constant motion.
1.2 NEWTON’S FIRST LAW
A body remains in its state of rest or constant motion unless a non-zero net/resultant force
acts on it.
Inertia resists change in the state of rest or constant motion of an object.
1.3 NEWTON’S SECOND LAW
When a net/resultant force acts on an object, the object accelerates in the direction of the
force. The acceleration is directly proportional to the force acting on the object and inversely
proportional to the object’s mass.
Fnet=ma
1.4 NEWTON’S THIRD LAW
When object A exerts a force on object B, object B will simultaneously exert a force equal in
magnitude but opposite in direction on object A.
1.5 NEWTON’S UNIVERSAL LAW OF GRAVITATION
Each body in the universe attracts every other body with a force that is directly proportional
to the product of their masses and inversely proportional to the distance between their
centres. F=Gm1m2/r2
o F= force
o G= universal gravitational constant (6.67×10N-11.m2.kg-2)
o m1= mass of object 1
1.1 KEYWORDS
Acceleration- rate of change of velocity.
Kinetic Frictional Force- the force acting parallel to a surface that opposes the motion of a
moving object relative to the surface.
Mass- the measure or amount of matter in an object.
Static Frictional Force- the Force that acts parallel to a surface and opposes the tendency of
motion of a stationery object relative to the surface.
Normal Force- the perpendicular force that a surface exerts on an object that it is in contact
with.
Weight- the gravitational force exerted on an object.
Inertia- the resistance of a body to change in its state of rest or constant motion.
1.2 NEWTON’S FIRST LAW
A body remains in its state of rest or constant motion unless a non-zero net/resultant force
acts on it.
Inertia resists change in the state of rest or constant motion of an object.
1.3 NEWTON’S SECOND LAW
When a net/resultant force acts on an object, the object accelerates in the direction of the
force. The acceleration is directly proportional to the force acting on the object and inversely
proportional to the object’s mass.
Fnet=ma
1.4 NEWTON’S THIRD LAW
When object A exerts a force on object B, object B will simultaneously exert a force equal in
magnitude but opposite in direction on object A.
1.5 NEWTON’S UNIVERSAL LAW OF GRAVITATION
Each body in the universe attracts every other body with a force that is directly proportional
to the product of their masses and inversely proportional to the distance between their
centres. F=Gm1m2/r2
o F= force
o G= universal gravitational constant (6.67×10N-11.m2.kg-2)
o m1= mass of object 1
