⚖️ Internal and External Forces
This quiz explores how forces act on structures and materials in Grade 7 physics. You'll learn to identify whether forces are internal (compression, tension, torsion, shear) or external, understand how forces cause deformation or failure, and use vector diagrams and Newton units to analyze structural behavior. **What you'll learn:** - Distinguish between internal and external forces - Recognize compression, tension, torsion, and shear in real structures - Apply vector diagrams to represent multiple forces - Measure and interpret forces in Newtons - Predict how forces affect structural integrity
Questions in this quiz
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- Question 1
A rope holding up a hanging picture is experiencing which type of internal force?
- Question 2
External forces are always visible on the surface of an object, while internal forces act only inside the material.
- Question 3
When you twist the ends of a towel in opposite directions to wring out water, which internal force is the towel experiencing?
- Question 4
Which of the following is an example of an external force acting on a structure?
- Question 5
A concrete pillar supporting the roof of a parking garage experiences which type of internal force?
- Question 6
Force is measured in Newtons, and 1 Newton equals the force needed to accelerate 1 kilogram of mass at 1 meter per second squared.
- Question 7
When you cut paper with scissors, the blades apply which type of internal force to the paper?
- Question 8
A vector diagram showing forces acting on a bridge beam uses arrows to represent forces. What does the length of each arrow represent?
- Question 9
A rubber band stretched between your fingers experiences tension. What happens to the tension when you stretch it further?
- Question 10
A structure fails when internal forces exceed the material's strength to resist those forces.
- Question 11
Which statement correctly describes the relationship between external and internal forces?
- Question 12
A suspension bridge uses long steel cables that hang from tall towers. Which type of internal force do these cables experience?
- Question 13
Compression and tension are opposite types of internal forces that cannot occur in the same structure at the same time.
- Question 14
When a building sways in the wind, the external force is wind pressure. What internal forces develop in the building's walls and framework?
- Question 15
A force of 50 N is applied to a block on a frictionless table, and another force of 30 N is applied in the opposite direction. Using vector addition, what is the net force on the block?
- Question 16
A wooden beam is positioned horizontally and supported at both ends. Which statement best describes the internal forces in this beam?
- Question 17
Different materials have different strengths against the same type of internal force; for example, steel resists tension better than concrete.