1. The application of knowledge to solve practical problems is known as
A.science.
B.curiosity.
C.technology.
D.experimentation.
2. Which is not a branch of natural science?
A.physical science
B.life science
C. Earth science
D.social science
3. What is the purpose of an experiment?
A.to communicate data
B.to test a hypothesis
C.to prove a scientific law
D.none of the above
4. A representation of an object or event is called
A.a scientific law.
B.a model.
C.a hypothesis.
D.a variable.
5. Which value is equivalent to 5 × 106?
A.five thousand
B.fifty thousand
C.five million
D.fifty million
6. What is the SI base unit of mass?
A.gram
B.kilogram
C.milligram
D.pound
7. An electric generator produces 10 megawatts. This amount is equivalent to
A. 10,000 watts.
B. 1,000,000 watts.
C. 10,000,000 watts.
D. 0.010 watt.
8. Motion is described with respect to a
A.graph.
B.displacement.
C.slope.
D.frame of reference.
9. Displacement is distance combined with
A.direction.
B.speed.
C.velocity.
D.magnitude.
10. Displacement vectors of 3 m and 5 m in the same direction combine to make a displacement vector that is
A. 2 m.
B. 0 m.
C. 8 m.
D. 15 m.
11. Average speed is the total distance divided by the
A.average distance.
B.average acceleration.
C.total time.
D.slope.
12. The slope of a distance-time graph is equal to the
A.speed.
B.acceleration.
C.displacement.
D.motion.
13. Velocity is
A.the slope of a linear graph.
B.acceleration divided by displacement.
C.speed with direction.
D.the same in all reference frames.
14. Two or more velocities can be combined by
A.graphing the slope.
B.using vector addition.
C.calculating the instantaneous speed.
D.determining the rate.
15. A ball just dropped is an example of
A.constant speed.
B.instantaneous speed.
C.combining displacements.
D.free fall.
16. Acceleration is equal to
A.distance divided by time.
B.change in speed divided by time.
C.the slope of a distance-time graph.
D.change in speed multiplied by time.
17. The rate at which velocity is changing at a given instant is described by
A.instantaneous acceleration.
B.average speed.
C.constant speed.
D.vector addition.
18. Which is not a force?
A.friction
B.gravity
C.momentum
D.weight
19. You push on a box and are unable to move it. What force opposes your push?
A.static friction
B.rolling friction
C.sliding friction
D.air resistance
20. Air resistance depends on
A.the velocity of a moving object.
B.the weight of a moving object.
C.the mass of a moving object.
D.the inertia of a moving object.
21. What force besides gravity acts on a projectile?
A.weak nuclear
B.electrical
C.magnetic
D.air resistance
22. Newton's first law of motion is sometimes called the law of
A.inertia.
B.conservation.
C.momentum.
D.resistance.
23. A change in which of the following affects the weight of an object?
A.momentum
B.velocity
C.acceleration due to gravity
D.friction
24. Which represents Newton's second law?
A.
B.
C. F = mv
D. F = 0
25. For every action force there is a
A.reaction force.
B.net force.
C.friction force.
D.unbalanced force.
26. Momentum depends upon
A.force only.
B.velocity and friction.
C.weight and mass.
D.mass and velocity.
27. Work is the product of
A.speed and force.
B.force and distance.
C.power and force.
D.motion and force.
28. Which of the following is a unit of work?
A.joule
B.watt
C.horsepower
D.newton
29. How much work, in N·m, is done when a 10.0-N force moves an object 2.5 m?
A. 0.25 N·m
B. 2.5 N·m
C. 25 N·m
D. 4.0 N·m
30. Power is equal to work divided by
A.time.
B.force.
C.distance.
D.mechanical advantage.
31. If a machine has a mechanical advantage much larger than 1, its output force is
A.much larger than its input force.
B.much less than its input force.
C.about the same as its input force.
D.in the same direction as its input force.
32. How is the work output of a machine related to its work input?
A.always less
B.always greater
C.always equal
D.always zero
33. A machine with a 5-N input force and a 25-N output force has a mechanical advantage of
A. 2.
B. 5.
C. 20.
D. 125.
34. The mechanical advantage of a pulley system depends upon
A.the diameter of the pulley wheels.
B.the length of the rope.
C.the number of sections of rope.
D.the direction of the input force.
35. A screw can be considered a type of
A.lever.
B.inclined plane.
C.pulley.
D.compound machine.
36. Which is not a simple machine?
A.wedge
B.screw
C.lever
D.fulcrum
37. The energy of a moving object is
A.kinetic energy.
B.potential energy.
C.chemical energy.
D.nuclear energy.
38. If the speed of an object doubles, its kinetic energy
A.doubles.
B.quadruples.
C.stays the same.
D.is halved.
39. An example of an object having elastic potential energy is
A.a stretched spring.
B.books on a shelf.
C.a moving arrow.
D.a falling oyster.
40. An example of electromagnetic energy is
A.a falling rock.
B.a stretched spring.
C.a speeding train.
D.sunlight.
41. Energy stored in the bonds between atoms is called
A.kinetic energy.
B.mechanical energy.
C.chemical energy.
D.thermal energy.
42. Mechanical energy is
A.found in machinery only.
B.usually measured at the atomic level.
C.the sum of the chemical and thermal energy of an object.
D.the sum of the kinetic and potential energy of an object.
43. An example of the conversion of gravitational potential energy into kinetic energy is
A.a falling raindrop.
B.a gasoline-powered engine.
C.striking a match.
D.a hockey puck sliding on ice.
44. The law of conservation of energy states that
A.energy cannot be converted from one form to another.
B.energy cannot be created or destroyed.
C.energy resources must be used efficiently.
D.energy is constantly being lost to friction.
45. Which of the following energy resources accounts for most of the world's present energy use?
A.uranium
B.solar energy
C.fossil fuels
D. wind energy