Transcript How To Calculate Net Force

How To Calculate
Net Force
What is a force?
• Force is a push or pull in a particular direction.
Forces can affect motion in several
ways:
• They can:
• make objects start
moving
• Move objects faster or
slower
• Stop objects
• change direction
FORCE FACTS:
• Measured in Newton's (N)
• Forces usually act in pairs
• Forces act in a particular
direction
• Usually cannot be seen
How to Calculate Net Forces
• When two forces act
in the same direction
on an object, the net
force is equal to the
sum of the two
forces
8N
6N
14N
How to Calculate Net Forces
Continued
• When two unequal
forces act in opposite
directions on an
object, the net force
is the difference of
the two forces
18N
50N
32N
Force, Mass, Acceleration
• Force = Mass x Acceleration
F= ma
How much force is required to accelerate a 50
kg mass at 4 m/s2?
F=
?
F=
M= 50 kg
A= 4 m/s
F=
200 N
50 kg * 4 m/s
What is the acceleration of a 7 kg mass being pulled
by a 56 N force?
F=
56N
F=ma
56N = 7 kg *
M= 7 kg
A=
?
8 m/s
?
What is the mass of a block accelerating at 2
m/s2 and pushed by a 9 N force?
F=
9N
M= ?
F=ma
9N
A = 2 m/s
4.5 kg
=
? *
2 m/s