Watch my latest video for AAPT Films (above). You can help your students understand a topic that gives many students trouble: Inclines. Many students struggle with learning inclines, so how can we introduce this concept convincingly? Learn how in the next seven minutes!

*Use experiment to help students understand inclines!*

You can start by showing students a frictionless situation. In this case, the gravity that is pulling it down the hill is

__weakened__by the flatness of the slope.**ACCELERATION**

The acceleration due to gravity is weakened by a factor that
depends on the angle. Can you imagine a
function of theta, that starts off at zero then grows to its maximum at 90
degrees? Why yes, its sine.

called

**diluting acceleration**.

**FORCES**

When it comes to

__forces__on inclines, here are a few tips.

You will want to introduce this AFTER you have discussed

friction on a flat surface, and of course Newton’s Laws,

especially Newton’s 3

^{rd}Law. That’s because the normal

force is often an equal and opposite reaction to other forces.

**FRICTION**

In most cases, friction opposes motion, so if the block was

sliding down the hill, the friction – kinetic friction

**-**would be
up the hill,
and if the block was sliding up the hill, the

friction would be down the
hill.

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