Physical Science1.txt

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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
• 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
• 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 Newtonï¿½s laws of motion and give examples.
31. 29) Distinguish between velocity and acceleration.
 Author: Anonymous ID: 105974 Card Set: Physical Science1.txt Updated: 2011-10-03 08:23:10 Tags: Physical Science Folders: Description: Test 1 Show Answers: