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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
Version 2.0
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