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Physics-Cockman
physics final conceptual questions
| Question | Answer |
|---|---|
| Which of the following operations will not change a vector? | Translate it parallel to itself |
| The resultant of two vectors is the smallest when the angle between them is | 180 |
| Ignoring air resistance, the horizontal component of a projectile's velocity | remains constant |
| Ignoring air resistance, the horizontal component of a projectile's acceleration | is zero |
| If the acceleration vector of an object is directed parallel to the velocity vector | the object is speeding up |
| When a football in a field goal attempt reaches its maximum height, how does its speed compare to its initial speed? | it is less than its initial speed |
| A stone is thrown horizontally from the top of a tower at the same instant a ball is dropped vertically. Which object is traveling faster when it hits the level ground below? | the stone |
| A bullet is fired horizontally, and at the same instant a second bullet is dropped from the same height. Ignore air resistance. Compare the times of fall of the two bullets. | they hit at the same time |
| A pilot drops a bomb from a plane flying horizontally at a constant speed. Neglecting air resistance, when the bomb hits the ground the horizontal location of the plane will | be over the bomb |
| The metric prefix for one one-thousandth is | milli |
| The number of significant figures in 10001 is | 5 |
| Suppose that an object travels from one point in space to another. Make a comparison between the displacement and the distance traveled. | The displacement is either less than or equal to the distance traveled |
| Suppose that a car traveling to the East (+x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its acceleration. | The car is decelerating, and its acceleration is negative |
| Suppose a can, after an initial kick, moves up along a smooth hill of ice (no friction). Make a statement concerning its acceleration. | It will have the same acceleration, both up the hill and down the hill. |
| Suppose a ball is thrown straight up. Make a statement about the velocity and the acceleration when the ball reaches the highest point. | Its velocity is zero and its acceleration is not zero |
| A ball is thrown straight up, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball is coming down. | Both its velocity and its acceleration point downward. |
| Ball A is dropped from the top of a building. One second later, ball B is dropped from the same building. As time progresses, the distance between them | increases |
| Ball A is dropped from the top of a building. One second later, ball B is dropped from the same building. As time progresses, the difference in their speeds | remains constant |
| The area under a curve in a velocity versus time graph gives | displacement |
| The slope of a velocity versus time graph gives | acceleration |
| Can work be done on a system if there is no motion? | No, because of the way work is defined. |
| If you push twice as hard against a stationary brick wall, the amount of work you do | remains constant at zero |
| Does the centripetal force acting on an object do work on the object? | No, because the force and the displacement of the object are perpendicular. |
| The area under the curve, on a Force versus position (F vs. x) graph, represents | work |
| A truck weighs twice as much as a car, and is moving at twice the speed of the car. Which statement is true about the truck's kinetic energy compared to that of the car? | The truck has 8 times the kinetic energy of the car. |
| You slam on the brakes of your car in a panic, and skid a certain distance on a straight, level road. If you had been traveling twice as fast, what distance would the car have skidded, under the same conditions? | It would have skidded 4 times farther |
| The quantity Fd/t is | the power supplied to the object by the force |
| When a cannon fires a cannonball, the cannon will recoil backward because the | momentum of the cannonball and cannon is conserved. |
| A rubber ball and a lump of putty have equal mass. They are thrown with equal speed against a wall. The ball bounces back with nearly the same speed with which it hit. The putty sticks to the wall. Which objects experiences the greater momentum change? | the ball |
| A small car meshes with a large truck in a head-on collision. Which of the following statements concerning the magnitude of the average collision force is correct? | The small car and the truck experience the same average force |
| Two objects collide and bounce off each other. Linear momentum | is definitely conserved. |
| In an inelastic collision, if the momentum is conserved, then which of the following statements is true about kinetic energy? | Kinetic energy is lost. |
| When you sit on a chair, the resultant force on you is | zero |
| You are standing in a moving bus, facing forward, and you suddenly fall forward. You can imply from this that the bus's | velocity decreased |
| A constant net force acts on an object. Describe the motion of the object | constant acceleration |
| The acceleration of an object is inversely proportional to | its mass |
| If you exert a force F on an object, the force which the object exerts on you will | always be F |
| A child's toy is suspended from the ceiling by means of a string. The Earth pulls downward on the toy with its weight force of 8.0 N. If this is the "action force," what is the "reaction force"? | The toy pulling upward on the Earth with an 8.0-N force. |
| Mass and weight | are two different quantities |
| A stone is thrown straight up. At the top of its path, the net force acting on it is | equal to its weight |
| A packing crate slides down an inclined ramp at constant velocity. Thus we can deduce that | a frictional force is acting on it |
| A block of mass M slides down a frictionless plane inclined at an angle θ with the horizontal. The normal reaction force exerted by the plane on the block is | Mg cos θ |
| Is it possible for an object moving with a constant speed to accelerate? Explain | Yes, although the speed is constant, the direction of the velocity can be changing |
| When an object experiences uniform circular motion, the direction of the acceleration is | is directed toward the center of the circular path |
| A pilot executes a vertical dive then follows a semi-circular arc until it is going straight up. Just as the plane is at its lowest point, the force on him is | more than mg, and pointing up |
| A car goes around a curve of radius r at a constant speed v. What is the direction of the net force on the car? | toward the curve's center |
| The gravitational force between two objects is proportional to | the product of the two objects |
| Two objects attract each other gravitationally. If the distance between their centers is cut in half, the gravitational force | quadruples |
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