Physical Science1.txt

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Physical Science1.txt
2011-10-03 04:23:10
Physical Science

Test 1
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  1. 1) A kilogram is a measure of an object's
    • A) gravity.
    • B) mass.
    • C) force.
    • D) weight.
    • E) center of mass.
  2. 2) Compared with the mass of a certain object on Earth, the mass of the same object on the Moon is
    • A) more.
    • B) the same.
    • C) less.
  3. 3) Which has zero acceleration? An object
    • A) moving at constant velocity.
    • B) at rest.
    • C) in mechanical equilibrium.
    • D) all of these
    • E) none of these
  4. 4) Hang from a pair of gym rings and the upward support forces of the rings will always
    • A) add up to equal your weight.
    • B) each be half your weight.
    • C) each be equal to your weight.
  5. 5) The two measurements necessary for calculating average speed are
    • A) distance and acceleration.
    • B) acceleration and time.
    • C) distance and time.
    • D) velocity and time.
    • E) velocity and distance.
  6. 6)If a freely falling object were somehow equipped with an odometer to measure the distance it travels, then the amount of distance it travels each succeeding second would be
    • A) less and less.
    • B) greater than the second before.
    • C) constant.
  7. 7) An object maintains its state of motion because it has
    • A) weight.
    • B) mass.
    • C) acceleration.
    • D) speed.
    • E) all of these
  8. 8) A force is a vector quantity because it has both
    • A) mass and acceleration.
    • B) magnitude and direction.
    • C) action and reaction counterparts.
  9. 9) The force required to maintain an object at a constant velocity in free space is equal to
    • A) the mass of the object.
    • B) the force required to stop it.
    • C) the weight of the object.
    • D) zero.
    • E) none of these
  10. 10) A player hits a ball with a bat. The action force is the impact of the bat against the ball. The reaction to this force is the
    • A) force of the ball against the bat.
    • B) air resistance on the ball.
    • C) grip of the player's hand against the ball.
    • D) weight of the ball.
    • E) none of these
  11. 11) Which of the following has the largest momentum relative to the earth?
    • A) a tightrope walker crossing Niagara Falls
    • B) a dog running down the street
    • C) the Science building on campus
    • D) a Mack truck parked in a parking lot
    • E) a pickup truck speeding along a highway
  12. 12) If you push an object just as far while applying twice the force, you do
    • A) the same amount of work.
    • B) four times as much work.
    • C) twice as much work.
  13. 13) What does an object have when moving that it doesn't have when at rest?
    • A) energy
    • B) momentum
    • C) mass
    • D) inertia
    • E) none of these
  14. 14) Newton discovered
    • A) gravity.
    • B) that gravity is universal.
    • C) neither
  15. 15)For the astronauts inside the orbiting space shuttle, there is no force of Earth's gravity acting on them. This statement is
    • A) sometimes true while in orbit.
    • B) always false.
    • C) always true while in orbit.
  16. 16)A rock is thrown upward at 50e with respect to the horizontal. As it rises, its vertical component of velocity
    • A) decreases.
    • B) remains unchanged.
    • C) increases.
  17. 17) earth satellites are typically more than 100 km high so as to be above the earth's
    • A) atmosphere.
    • B) gravitational field.
    • C) both of these
  18. 18) Water pressure is greatest against the
    • A) bottom of a submerged object.
    • B) sides of a submerged object.
    • C) is the same against all surfaces.
    • D) top of a submerged object.
    • E) none of these
  19. 19) When you touch a cold piece of ice with your finger, energy flows
    • A) from your finger to the ice.
    • B) from the ice to your finger.
    • C) actually both ways
  20. 20) The lowest temperature possible in nature is
    • A) 4 K.
    • B) 0eC.
    • C) -273eC.
  21. 21) A substance can absorb heat energy by the process of
    • A) radiation.
    • B) convection.
    • C) conduction.
    • D) all of these
  22. Do problems 22-26 or the essay questions:
  23. 22) What is the average speed of a cheetah that sprints 280 meters in 6 seconds?
  24. 23) What is the acceleration of a vehicle that changes its velocity from 200 km/hr to a dead stop in 2 seconds?
  25. 24) Calculate the applied force on an object of mass m=5 kg from rest to produce an acceleration of 10 m/s.
  26. 25) What is the momentum of a truck with mass m = 1000kg, moving at 80 m/s?
  27. 26). Calculate the work done on the Earth by a colliding comet of mass m=10,000kg traveling at a speed of v=200,000m/s.
  28. Essay questions:
  29. 27) State the impulse-momentum relationship and give an example.
  30. 28) State Newton�s laws of motion and give examples.
  31. 29) Distinguish between velocity and acceleration.