General Physics Study Guide

Topics: Force, Classical mechanics, Mass Pages: 15 (3264 words) Published: October 12, 2012
1.All except one of the following require the application of a net force. Which one is the exception? | Changing an object's speed without changing its direction of motion| | Changing an object's direction of motion without changing its speed| | Maintaining an object in uniform circular motion|

| Changing an object from a state of rest to a state of motion| | Maintaining an object in motion at a constant velocity|

2.The force that accelerates a car on a level road is exerted by the | motor.|
| gears.|
| gasoline.|
| road.|
| tires.|

3.The frictional force, due to air resistance, acting on an object is always | in the upward direction.|
| in the direction of the object's motion.|
| in the opposite direction to the object's motion.|
| greater than the net force.|
| smaller than object's weight.|

4. The erroneous idea that an object needs a force on it to keep moving even at constant velocity was held by | Newton.|
| Galileo.|
| Aristotle.|

5. Two pieces of kryptonite, #1 and #2, have identical masses, but the net force applied to #1 is 20 N and to #2 is 400 N. The acceleration | of each piece of kryptonite is the same.|
| depends on the weight of each piece of kryptonite.|
| of #2 is larger.|
| of #1 is larger.|

6. A car rounds a curve while maintaining constant speed. The correct statement is: | The velocity of the car is constant.|
| The velocity of the car is zero.|
| The acceleration of the car is zero.|
| No net force acts on the car.|
| A net force acts upon the car.|

7. A block of mass 5.0 kg is acted upon by a single force, producing an acceleration of 2.0 m/s2. The force has a value of | 10 N.|
| 5.0 N.|
| 0.5 N.|
| 2.5 N.|

8. A 10.0 kg block on a smooth horizontal surface is acted upon by two forces: a horizontal force of 70 N acting to the right and a horizontal force of 30 N to the left. The acceleration of the block will be | 10.0 m/s2 to the right.|

| 2.3 m/s2 to the right.|
| 210.0 m/s2 to the right.|
| 4.0 m/s2 to the right.|

9. A crate is acted upon by a net force of 100 N. An acceleration of 5.0 m/s2 results. The weight of the crate is | 196 N.|
| 20 N.|
| 196 lb.|
| 0|
10. An elevator of mass 500 kg is caused to accelerate upward at 4.0 m/s2 by a force in the cable. What is the force exerted by the cable? | 2,000 N|
| 4,900 N|
| zero|
| 2,900 N|
| 6,900 N|

11. A certain force causes a 50 kg person to accelerate at 1.0 m/s2. The same force applied to a 75-kg person would cause | a greater acceleration.|
| a smaller acceleration.|
| the same acceleration.|

12. A dog weighs 250 N. What is his approximate weight in pounds (lb)? | 25 lb.|
| 100 lb.|
| 55 lb.|
| 250 lb.|
| 32 lb.|
13. Your mass is 50 kg. Suppose you are standing on a scale in an elevator that is approaching a top floor and decreasing its speed at the rate of 2 m/s every second. What would be the reading on the scale? | 490 N.|

| 0.|
| 590 N.|
| 100 N.|
| 390 N.|


Three forces act on the object in the sketch. In what direction will the object move? | To the left.|
| Upward.|
| To the right.|
| To the left and up.|
| To the right and up.|

15. A father and his young daughter are on very clean ice, so there is very little friction (the father has more mass than the daughter). The father pushes his daughter forward and she slides away at a speed of 3 m/s. The father's velocity is | smaller than 3 m/s in the same direction as his daughter.| | 3 m/s in the same direction as his daughter.|

| smaller than 3 m/s in the opposite direction as his daughter.| | zero.|
| 3 m/s in the opposite direction as his daughter.|

16. Earth's gravity attracts a person with a force of 120 lbs. The force with which the Earth is attracted towards the person is | small...
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