Inferring... Objective: Infer how friction affects the movement of an object Materials: ball, clear pavement or pathway Procedure: 1. Let a ball roll on a pavement or a clear pathway. 2. Observe what happens to the ball as it rolls along the pavement. Guide Questions: 1. When you rolled the ball on the pavement, did you exert a force? 2. While the ball is rolling along the pavement are you still exerting a force? a 3. What happened to the ball after some time? 4. Why did the ball stop rolling? 5. Did friction affect the movement of an object? How?
Answers & Comments
Answer:
1.These are all the forces acting on the ball: friction, gravity, and a normal force.
2.When you roll a ball on the ground, the electrons in the atoms on the surface of the ground push against the electrons in the atoms on the surface of your ball that is touching the ground. A rolling ball stops because the surface on which it rolls resists its motion. A rolling ball stops because of friction.
1.On occasions, a normal force is exerted horizontally between two objects that are in contact with each other.
Types of Forces.
Contact Forces Action-at-a-Distance Forces
Frictional Force Gravitational Force
Tension Force Electrical Force
Normal Force Magnetic Force
Air Resistance Force
2.The forces are the weight, drag, and lift. Lift and drag are actually two components of a single aerodynamic force acting on the ball.
3.The force in question is friction. ... There is also friction between the ground and part of the ball that touches the ground as it rolls. The friction force acts in the opposite direction to the motion of the ball, slowing it and eventually stopping it.
4When you roll a ball on the ground, the electrons in the atoms on the surface of the ground push against the electrons in the atoms on the surface of your ball that is touching the ground. A rolling ball stops because the surface on which it rolls resists its motion. A rolling ball stops because of friction.