How to give rolling ball more friction

[Sperarow]

In many games on roblox, there are grenades that you can throw far, but when they hit the ground, they roll and stop quickly, making for easy throws. When I tried this, it seems that rolling balls on roblox just keep going and don’t slow down. Here’s what I’m talking about:

My game:

Works properly in Combat Warriors:

You can see that in my game, the ball just keeps rolling. In Combat Warriors, it hits the ground and rolls slowly like it would in real life. I’ve tried to add friction via CustomPhysicalProperties, but it doesn’t seem to have any effect.
Thanks.

[Volieb (Vinny)]

Consider the documentation provided on part friction customization.

https://developer.roblox.com/en-us/api-reference/property/BasePart/CustomPhysicalProperties

[Sperarow]

I’ve tried to add friction via CustomPhysicalProperties, but it doesn’t seem to have any effect.

[Volieb (Vinny)]

I would suggest changing the gravitational physics of the ball part. Consider this topic here which discusses how to increase/decrease the “gravity” of an object using upwards or downwards force via BodyForce.

How do you change the gravity of a part, but keep the world gravity the same?

What do you want to achieve? I want to change a part’s gravity value while keeping the world’s gravity. I’m working on a car that uses a different gravity value and I’m about to publish it as a free model and I want to give the car a different gravity value automatically rather than making an instruction manual that no one will probably read then call it “broken”. What is the issue? I don’t know how to change the gravity value of a specific part via script. What solutions have you tried so…

[Sperarow]

This really wasn’t the answer I was looking for, as I was asking how to increase friction on a rolling ball. In real life, if you roll a ball across a flat surface, it won’t roll forever, it’ll eventually stop, that’s friction. For some reason, balls just roll forever in Roblox. Though, at this point I think I’m just going to detect when the grenade hits the ground via raycasting then increase the gravity exponentially using the post you provided.

[Gam3r_Play3r (Nuclear_Guy)]

@Sperarow

Though, at this point, I think I’m just going to detect when the grenade hits the ground via raycasting then increase the gravity exponentially using the post you provided.

Forget that, I believe the reason why your ball is endlessly spinning is due to its weight (CustomPhysicalProperties > Density), and I’d recommend trying to use real units to calculate a ball’s density.
Here’s a devforum post that teaches you how to do so:

Conversion of roblox and real world units?

I’m working on a little unit conversions module, and was looking for help regarding unit conversions for real world units to roblox units and vice versa. I think it’s safe to say This blog post confirms that 1 stud converts to 5 centimeters given workspace.Gravity’s default value of 196.200 (196.200 / 20 = 9.81, and 20 * 5cm = 1 meter). I was told that representation then allows you to find the relation of 1 kg = 8000 “roblox masses”, but I’m unsure how they came to that conclusion to validate…

[atomzz24 (AtomicCommander)]

maybe you can try changing the ball velocity once it hit the ground (making the velocity smaller and smaller until it reach 0 on all axis)

[Sperarow]

Hey guys, thanks for the replies but I ended up raycasting to check if the grenade hit the ground then applying a VectorForce opposite of the grenade’s X and Z velocity, which worked pretty well. It also allowed me to play a sound whenever the grenade hit a new part, to alert other players of the grenade being thrown near them.

[AwesomeXForLife (Whimsical)]

Just though i’d add that CustomPhysicsProperties, doesnt effect rotational movement, only objects that slide. So basically, a ball would roll forever as there is no force moving against the rotational velocity of the ball. You’d need to somehow modify the dampening of the ball.