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Name: ____________________________________________ Date: _______________________ Class: ____________________
Bone Crusher Activity — Fracture Worksheet Answer Key 1
Bone Crusher Fracture Worksheet Answer Key
Questions
- In general, which bones will require more force to break? Explain why. The more dense bones require more force to break because they are the ones that support the weight and movement forces of the body and help the body to move. They must withstand more force because they are impacted by forces more directly than other bones. For example, when you jump, the femur and tibia must be able to withstand the impact when your body returns to the ground.
- Does the direction in which the force is applied make a difference? Explain. Yes, the direction the force is applied does make a difference because bones are made to withstand impact in certain directions, but not others. Thus, more injuries are seen in football because the body is incurring forces at odd angles.
- Which bones in the body are harder to repair? The bones located at joints, such as elbows, hips and knees, are harder to repair because the ability to isolate the fracture is limited. When these joints are immobilized, such as with casts, calcification begins to occur. So the casts must be removed before the fracture is completely healed.
Name: ____________________________________________ Date: _______________________ Class: ____________________
Bone Crusher Activity — Fracture Worksheet Answer Key 2
Data Collection
Bone (from cat)
Bone Mass (g)
Bone Volume (ml)
Bone Density (g/ml)
Predicted Fracture Force (N or lbs)
Experimental Fracture Force* (N or lbs)
femur (^) in tension100 lbs
tibia (^) in compression^120 lbs
fibula (^) in compression85 lbs
humerus (^) in tension80 lbs
rib (^) in compression15 lbs
tail (^) in compression35 lbs
- Indicate whether the bone was subjected to tension or compression force.
Were your predictions of bone strength accurate? Explain. Answers will vary, depending on students ’ predictions.
Fracture Examination and Type Determination
Bone (from cat) Description of How^ the Bone Fractured^ Type of Bone Fracture
femur Answers will vary. Answers will vary.
tibia
fibula
humerus
rib
tail
Types of bone fractures : avulsion, comminuted, fissure, greenstick, impacted, oblique, transverse
Example answers : The bone broke into multiple pieces; it broke at the end or the middle; the break is straight across, angled or spiral; the break was not all the way across, etc.
Example answers : avulsion, comminuted, fissure, greenstick, impacted, oblique, transverse
Answers will vary.
Note : Compression mode requires more force to break bones than tension mode.
