diff --git a/ToyEngine/src/DemoWorld.cpp b/ToyEngine/src/DemoWorld.cpp
index 9d862cf..701baec 100644
--- a/ToyEngine/src/DemoWorld.cpp
+++ b/ToyEngine/src/DemoWorld.cpp
@@ -65,7 +65,7 @@ DemoWorld::DemoWorld()
 
 		if (i != 0)
 		{
-			float ks = 300, kd = 100;
+			float ks = 300, kd = 500;
 			physicsManager.addSpring(particles[i - 1], particle, 0.005, ks, kd);
 		}
 	}
@@ -93,9 +93,18 @@ void DemoWorld::logicalTick(float deltaTime)
 	if (abs(throwPerson->getAnimatorCurrentTime() - 3.41f) < 1e-2f)
 	{
 		mk2->setPosition(throwPerson->getPosition() + glm::vec3(-0.5, 2.2, 0));
-		mk2->setSpeed(glm::mat3_cast(throwPerson->getRotation() * glm::rotation(glm::vec3(1, 0, 0), glm::normalize(glm::vec3(0, 1, 1)/*方向*/))) * glm::vec3(15/*速度*/, 0, 0));
+		mk2->setSpeed(glm::mat3_cast(throwPerson->getRotation() * glm::rotation(glm::vec3(1, 0, 0), glm::normalize(glm::vec3(0, 2, 1)/*方向*/))) * glm::vec3(10/*速度*/, 0, 0));
 		mk2->setEnableGravity(true);
 	}
+
+	if (mk2->getPosition().y < 6.5f && mk2->getSpeed().y<0)
+	{
+		particles[particles.size() / 2]->setSpeed(particles[particles.size() / 2]->getSpeed() + mk2->getSpeed()/2.f);
+		mk2->setEnableGravity(false);
+		mk2->setSpeed(glm::vec3(0));
+		//mk2->setPosition({ 0,-100,0 });
+	}
+
 }
 
 void DemoWorld::rendererTick(float deltaTime)
diff --git a/ToyEngine/src/Particle.cpp b/ToyEngine/src/Particle.cpp
index e2e4032..a083b3a 100644
--- a/ToyEngine/src/Particle.cpp
+++ b/ToyEngine/src/Particle.cpp
@@ -120,8 +120,8 @@ void Particle::setEnableGravity(bool enable)
 		if (!gravity)
 		{
 			gravity = std::make_shared<Force>(glm::vec3(0.f, -getMass() * 9.80665f, 0.f));
-			addForce(gravity);
 		}
+		addForce(gravity);
 	}
 	else
 	{