TEKS 8.6 A: Balanced and Unbalanced Forces

TEKS 8.6 A: NET FORCE

Balanced and Unbalanced Forces

What is a force?

■

A force is a push or pull that causes an object
to move, stop, or change direction

■

In physics a force is anything that makes an
object accelerate

Force

■ Forces come in pairs

■ Forces have a magnitude and a

direction

■ 1 N (Newton) = 1 kg * m/s/s

5N, north (up)
Magnitude: 5N
Direction: north (up)

NET FORCE

■ Net Force is the combination of

all the forces on an object.

■ The Net Force is ZERO if forces on an

object are equal and in opposite
direction.

■ Net FORCE is NOT ZERO if forces are

not equal.

■

Balanced and Unbalanced Forces

■ Forces occur in pairs and they

can be either balanced or
unbalanced

Balanced Forces

■ Balanced forces do not cause change

in motion. They are equal in size and
opposite in direction

Unbalanced Forces

■ An unbalanced force always causes a

change in motion (speed, direction, or
both). Objects move where the greater
force is.

■ When unbalanced forces act in opposite

directions you can find the net force

⚪

Net force

■

Magnitude

⚪

The difference between the two forces

■

Direction

⚪

Direction of the largest force

How do UNBALANCED FORCES affect motion VIDEO

To calculate the Net
force you MUST:
>SUBTRACT: Forces
that go the opposite
direction.
>ADD Forces that go
the same direction.

Unbalanced Forces

3 N, right – 6 N, left = 3N, left

Unbalanced Forces
Calculating Net Force

4 N, left – 10 N, right = ????

What is the NET FORCE and in What Direction?

How Do You
Determine Net
Force?:

>SUBTRACT:
Forces that go the
opposite direction.
>ADD Forces that go
the same direction.

Unbalanced Forces

4 N, left – 10 N, right = 6N, right

To calculate the Net
force you MUST:
>SUBTRACT: Forces
that go the opposite
direction.
>ADD Forces that go
the same direction.

Unbalanced Forces

5 N, right + 10 N, right = ???

What is the NET FORCE and in What Direction?

To calculate the Net
force you MUST:
>SUBTRACT: Forces
that go the opposite
direction.
>ADD Forces that go
the same direction.

Unbalanced Forces

5 N, right + 10 N, right = 15N, right

To calculate the Net
force you MUST:
>SUBTRACT: Forces
that go the opposite
direction.
>ADD Forces that go
the same direction.

Guided Practice

Calculating Net Force

To calculate the Net
force you MUST:
>SUBTRACT: Forces
that go the opposite
direction.
>ADD Forces that go
the same direction.

Independent Practice
Calculating Net Force

To calculate the Net
force you MUST:
>SUBTRACT: Forces
that go the opposite
direction.
>ADD Forces that go
the same direction.

Independent Practice
Calculating Net Force

To calculate the Net
force you MUST:
>SUBTRACT: Forces
that go the opposite
direction.
>ADD Forces that go
the same direction.