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40 Cards in this Set
- Front
- Back
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Which of the following quantities would be different on the moon than on the earth?
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acceleration due to gravity
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Which of the following relationships is correct?
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m = F / a
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What determines the time a horizontally projected object remains in the air?
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projection height
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If an object of constant mass travels with a constant velocity, which statement is true?
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-momentum is constant
-acceleration is 0 both A & B |
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A skater gliding on ice will continue to move in the same direction and with the same speed (in the absence of the action of additional forces). This exemplifies which of the following laws?
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Newton's first law of inertia
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A 500N gymnast performing a giant swing with an angular velocity of 5 rad/sec, exerts 90 Nm of torque on the support bar. How much torque is exerted by the bar on the gymnast's hands?
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90 Nm
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The higher the jump, the "harder" the landing. This statement reflects which of the following laws
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the law of action/reaction
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Which quantity is not a force?
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mass
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The 2 variables that determine momentum are
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velocity and mass
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In sporting activities, what amount of friction is desired?
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depends on the situation
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What variable may be described as "the quantity of motion" possessed by an object?
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momentum
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The principle of conservation of momentum restates which of Newton's laws?
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inertia
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Which of the following mechanical quantities is not dependent on time?
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work
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Which of the following correctly describes impact?
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large force applied over a short period of time
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Which of the following is true of the coefficient of restitution of a racquetball?
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it is a number relating to the elasticity of a ball against a particular surface
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The product of a force and the time during which it acts defines what?
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impulse
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The capacity for doing work that a body possesses because of its height or position is called what?
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potential energy
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Energy of motion is also called what?
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kinetic energy
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Which of the following mechanical quantities is evident in explosive track and field events, such as the long jump and the shot put
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mechanical power
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Which of the following pairs of quantities are expressed in the same units of measure?
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-friction and weight
-work and energy both A and B |
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Which of the following is a correct unit of mechanical energy?
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Joules
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When two bodies collide head-on and then continue to travel collectively in the original direction of motion of one of the bodies, what factor determines the direction of collective motion after the collision?
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the relative momenta of the two bodies
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Which of the following statements is true of the amount of horizontal force required to start an object sitting on a horizontal surface in motion?
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it must be greater than the maximum static friction force
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Which of the following statements is true about the relationship between impact and impulse?
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impacts generate impulses
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Which of the following factors does not affect the amount of friction generated between two dry surfaces?
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the surface area in contact
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What type of energy is strain energy?
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potential
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Which of the following would be typical for vertical ground reaction force (GRF) during running?
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GRF = 2 X body weight
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What is/are the direction(s) for vertical ground reaction force?
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up
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Which of the following is/are true statement(s) regarding the law of gravitation?
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both A and B
-All bodies are attracted to one another with a force proportional to the product of their masses. -All bodies are attracted to one another with a force inversely proportional to the square of the distance between them. |
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Which of the following relationships is always true?
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μk < μs
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How does adding weight to the back of a pickup increase the friction between the tires and the icy road?
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changes R
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How does wearing gloves increase the friction between the hands and the bat?
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changes μs
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Which of the following is a correct unit for linear momentum?
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kg•m/s
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What happens to momentum when an impulse acts on a system?
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momentum is changed
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Which of the following is closest to a perfectly elastic impact?
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superball dropped on a hard surface
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Which of the following affects the coefficient of restitution between a tennis racket and tennis ball?
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-how long the ball has been out of the can
-how many times the ball has been hit -tightness of the grip All of the above |
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The formula for mechanical work is the product of which of the following?
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force and displacement
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Negative mechanical work involves which of the following?
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net torque and angular motion are in different directions
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Which of the following is/are correct formula(s) for mechanical power?
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P = W/t
P = Fd/t P = Fv All of the above |
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Which of the following is a correct unit of mechanical power?
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Watts
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