Which of the following relationships is always true?
A. µk < µs
B. µs < µk
C. µk = µs
D. none of the above
Answer: A
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Biomechanics Chapter 12
- From a mechanical perspective, it is easier to pull an object than to push it.
- A motionless object sitting on a motionless surface, with no horizontal force application, has no friction.
- Harder running surfaces result in greater ground reaction forces.
- Elite sprinters display greater impulse against the starting blocks than sub-elite sprinters.
- New blade designs have resulted in extremely low values for the kinetic friction coefficients of ice hockey skates on ice.
- An impact resulting in the total loss of velocity would be called a perfectly _______________ impact.
- Two common forces that act to reduce momentum are _______________ and _________________.
- Newton's law of acceleration demonstrates the relationship between acceleration, _______________ and ___________________.
- A number that serves as an index of elasticity for colliding bodies is called coefficient of ___________________.
- Newton's law of _______________ can be restated as the conservation of ________
- Which of the following is a correct unit of mechanical power?
- Which of the following is/are correct formula(s) for mechanical power?
- Negative mechanical work involves which of the following?
- The formula for mechanical work is the product of which of the following?
- Which of the following affects the coefficient of restitution between a tennis racket and tennis ball?
- Which of the following is closest to a perfectly elastic impact?
- What happens to momentum when an impulse acts on a system?
- Which of the following is a correct unit for linear momentum?
- How does wearing gloves increase the friction between the hands and the bat?
- How does adding weight to the back of a pickup increase the friction between the tires and the icy road?
- Which of the following is/are true statement(s) regarding the law of gravitation?
- What is/are the direction(s) for vertical ground reaction force?
- Which of the following would be typical for vertical ground reaction force (GRF) during running?
- What type of energy is strain energy?