FORCES https www brainpop comscienceenergyforces Stationary Forces Sliding

FORCES

https: //www. brainpop. com/science/energy/forces/ Stationary Forces: Sliding Forces:

P. 13. 3: Investigate and describe that an unbalanced force acting on an object changes its speed, direction, or motion. Force: push or pull on an object Net Force: sum of the forces. Measured in Newtons (N) Balanced Force: sum of the forces that is = to zero Unbalanced Force: sum of the forces that is NOT = to zero Friction: the resistance a surface puts on anything sliding over it examples of sliding friction examples of stationary friction

Drag: the friction of air molecules Velocity: the change in speed or direction Thrust: the force that propels the plane upward Lift: the downward force on the air as it flows past What would make the plane descend to the ground below?

A The lift is equal to the drag. B The lift is less than the weight. C The thrust is equal to the weight. D The thrust is greater than the drag.

Propulsion Lab Can your plane travel 2 Meters using forces? Materials Manager: materials Scribe: measures string and length traveled Group Leader: holds string Time Keeper: tests ideas and is the propeller Encourager: keeps the group focused 1. Find a group of 4 or 5 2. Have materials manager get the supplies 3. Figure out a way to propel the balloon down the string. 4. The balloon must be untied. It must go at least 2 Meters. Must only use 2 - 2 inch pieces of tape. 5. Figure it out? Early finishers can figure out a way to add a passenger (paperclip) to your “plane”.