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Free-Body Diagrams
Use on-screen controls to construct the free-body diagrams for each of 12 physical situations. Earn a “star" for each correct diagram. Think Physics!
Start
Situation 7
Situation 11
Situation 1
Situation 6
Situation 10
Situation 5
In this activity, you will construct free-body diagrams for 12 different situations.  Once you have correctly constructed the free-body diagram, a star will appear next to the button for that situation.
Situation 9
Situation 4
Situation 3
Situation 12
Situation 8
Situation 2
Situation 1
0
Normal
A rightward-moving car is skidding to a stop across a level roadway with locked wheels. Ignore air resistance.    
Gravity
Check
A rightward force is applied to a crate to push it across the floor at a constant speed. Ignore air resistance.
A football is moving upward and rightward towards the peak of its trajectory. Ignore air resistance.    
None
Air Resistance
Identify the rightward force:
Spring
The cabin of a small freight elevator is secured to a motor by a cable and is moving upward with a constant speed. There is no contact between the cabin and the elevator shaft. Ignore air resistance.    
Select a button to add, remove or change a force. Use the Check button to evaluate your FBD.
Tension
Applied
0
A downward-moving skydiver is falling with a constant speed.   
A football, originally kicked at an 40-degree angle to the horizontal, is at the peak of its trajectory. Ignore air resistance.    
Friction
A rightward force is applied to a dresser to accelerate it to the right across the bedroom floor. Ignore air resistance.    
A downward-moving skydiver who has just opened the parachute is slowing down. (Diagram the forces on the skydiver/parachute combination.)   
The cabin of a small freight elevator is secured to a motor by a cable and is moving upward while slowing down. There is no contact between the cabin and the elevator shaft. Ignore air resistance.   
Congratulations! You have accurately constructed the free-body diagram for this situation. Click the button below to return to the main menu and complete additional free-body diagrams.
Sorry. Your free-body diagram is NOT correct. To begin with, correct the force types. One or more of the force types that you have chosen is incorrect. Please try again.
Left
A softball player does a head-first dive and is sliding to the right across the infield dirt. Ignore air resistance. 
Sorry. Your free-body diagram is NOT correct. The force types that you have chosen are correct. The errors pertain to the sizes of your forces. Re-read the question; think about how the direction of the acceleration relates to the relative size of two opposing forces. Then try again.
Up
Right
Down
Return to Main Menu
OK. Let me Try Again.
A hockey puck glides to the right across the ice at a constant speed. Ignore air resistance.  
Return
A sledder has reached the bottom of a hill and is coasting to the right while slowing down along the loosely-packed snow. Ignore air resistance.   
1
Free-Body DiagramClick on an arrow to change its size.