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Physics Sem. Exam
| Question | Answer |
|---|---|
| What type of velocity of an object projected into the air is constant? | vertical |
| What type of velocity of an object thrown into the air changes? | horizontal |
| What is the maximum range of a projectile when projected into the air? | forty-five degrees |
| The number of miles traveled is? | distance |
| The change in displacement per unit of time is? | velocity |
| The rate of change of velocity is? | acceleration |
| Scalar units are what? | magnitude |
| Vector units are what? | magnitude and direction |
| The constant acceleration of an object in free fall is always? | 9.8m/s^2 |
| When no air is present all objects will fall at the same rate, what is known to do this? | vacuum tube |
| The slope of a displacement-time graph equals what? | velocity |
| The slope of a velocity-time graph equals what? | acceleration |
| The area under a velocity-time graph equals what? | displacement |
| The area under an acceleration-time graph equals what? | velocity |
| The speed of an object thrown upward will what until they stop going up? | decreases |
| Once the upward thrown object has stopped in the air it’s speed will begin to what on the way down at the same right? | increases |
| Vertical and horizontal velocities are completely what of each other? | independent |
| 1 meter equals how many centimeters? | one hundred |
| 1 kilometer equals how many meters? | one thousand |
| 1 meter equals how many millimeters? | one thousand |
| Which of Newton’s Laws of Motion says, for every action there is an equal and opposite reaction? | third |
| Which of Newton’s Laws of Motion says, an object will remain in its present state of motion unless acted upon by an unbalanced force also called Inertia? | first |
| Which of Newton’s Laws of Motion says, when an unbalanced force acts on an object it will accelerate in the direction of the force? | second |
| What are the units used to measure force? | newtons |
| What are the fundamental units that make up a newton? | kilogram times meter per second squares |
| What 2 things does the force of gravity depend on between objects? | mass and distance |
| With more space between the objects there is more or less force present that there would be if there was more mass? | less |
| With more mass present than force then it will have more or less force than that of an object with less mass? | more |
| The force of gravity on an object is also called? | weight |
| If you weigh yourself in an elevator while it is accelerating upward, your weight appears to be what? | more |
| If you weigh yourself in an elevator while it is accelerating downward, your weight appears to be what? | less |
| If you weigh yourself in an elevator while it is in free-fall, your weight appears to be what? | weightless |
| If you weigh yourself in an elevator while it is accelerating at a constant speed, your weight appears to be what? | normal |
| Defined as the force on an object time the displacement of an object, measured in joules, is called? | work |
| What are the fundamental units that make up a joule? | newton times mass |
| Work done on an object divided by the time taken to do the work, measured in joules, is called? | power |
| What are the fundamental units that make up a watt? | joules per speed |
| The energy of motion, measured in joules, is called? | kinetic energy |
| The energy of position that depends completely on the distance an object is the ground? | potential energy |
| What is conserved during a collision? | momentum |
| What must equal before and after a collision? | total momentum |
| When the momentum changes in one object, the object it is acting on will have the same what? | impulse |
| The attractive force between all objects directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers is called what? | law of universal gravitation |
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Blondie1129
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