We can use velocity to make our movements feel smooth.

Moving Left and Right

when green flag clicked
forever
	if <key (right arrow v) pressed?> then
		change [x velocity v] by (1)
	end
	if <key (left arrow v) pressed?> then
		change [x velocity v] by (-1)
	end
	set [x velocity v] to ((x velocity) * (0.9))
	change x by (x velocity)
end

Exercise: Moving Up and Down

Can you add the ability to move up and down? You can see the solution here.

You might also want to look at how to point yourself in the right direction using velocity.