Effects of Forces Quiz
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5 questions, one answer each
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1. A spring has a spring constant of 250 N/m. What is the extension of the spring when a force of 50 N is applied to it?
- A. 0.2 m
- B. 0.5 m
- C. 5 m
- D. 200 m
2. Which of the following best describes friction?
- A. A force that always accelerates an object in the direction of motion
- B. A force between two surfaces that may impede motion and produce heating
- C. A force that only acts on objects moving through liquids
- D. A force that increases the velocity of an object
3. Two forces of 12 N and 8 N act along the same straight line in opposite directions. What is the resultant force?
- A. 20 N
- B. 4 N
- C. 96 N
- D. 0 N
4. A student plots a load-extension graph for a spring and notices that the gradient changes after a certain point. What does this point represent?
- A. The spring will snap
- B. The limit of proportionality
- C. The maximum load the spring can support
- D. The point where elastic potential energy is greatest
5. An object is moving in a circular path at constant speed. The centripetal force acting on the object is perpendicular to its motion. If the radius of the circular path is decreased whilst keeping the mass and speed constant, what happens to the required centripetal force?
- A. It decreases proportionally
- B. It remains unchanged
- C. It increases proportionally
- D. It decreases and then increases