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Physics
Chapters 4 & 5 (Clicker & Reading Questions)
| Is force a scalar or a vector? | Vector |
| An object has two forces acting on it. One force with a magnitude of 10 N acts in a northerly direction. The other force with a magnitude of 10 N acts in an easterly direction. What is the magnitude of the net force acting on this object? | Less than 20 N but not zero |
| A car is moving at a constant velocity in a straight line. | The net force acting on the car is zero. |
| T or F: Forces acting in the vertical direction can influence motion in the horizontal direction, and forces acting in the horizontal direction, can influence motion in the vertical direction. | False |
| What happens to an object that has a non-zero net force acting on it? | It will accelerate. Its velocity will change. |
| Newton's second law and the equations in Chapter 2 both include the concept of | Acceleration |
| T or F: In every circumstance, no matter what else may be happening, the force of object A on object B is equal in magnitude and opposite in direction to the force of object B on object A. | True |
| Yes or No: Is the Normal force acting on an object always equal to the weight of the object? | No |
| T or F: You pull on a "massless"rope that is tied to a tree. The tension of the string pulling on you is the same as the tension of the string pulling on the tree. | True |
| Correct answers about a Free Body Diagram. | A free body diagram shows all the forces acting on a single object. Forces are represented as vectors on a free body diagram. |
| T or F: When there are two or more objects in a problem, a separate free body diagram should be drawn for every object. | True |
| Match the terms and descriptions: A measurement of an object's inertia The force of gravity acting on an object Will be different on a different planet Will be the same on a different planet | Mass Weight Weight Mass |
| When a car is turning on a banked corner, which force(s) contribute to the net radial force that causes a centripetal acceleration. (Choose all that apply) | Friction. Normal |
| When a car is turning on a flat road, what force is responsible for creating the necessary centripetal acceleration? | The frictional force of the road on the car. |
| Which of the following could contribute to the net radial force that causes a centripetal acceleration? | Gravity, Tension, Friction, & Normal. |
| T or F: Centripetal force is a new, distinct force, like tension or friction. | False |
| The SI units of frequency are: | 1/s |
| T or F: Your book writes radial, or centripetal, acceleration as ar = v2/r. Using bold face letters to represent vectors, it would also be correct to write this equation as ar = v2/r. | False |
| A bicycle turns a corner at a constant speed. Which of the following is true about the bicycle at any moment while it is turning.? | It has an acceleration perpendicular to the direction of motion. |
| The direction of centripetal acceleration is | toward the center of the circle. |
| T or F: When solving force problems along an inclined slope, it is usually best to define the x and y axes parallel to the horizontal and vertical directions, repsectively. | False |
| Static Friction or Kinetic Friction: --This is not always proportional to the normal force. --This is always proportional to the normal force. --Occurs when two objects slide across each other. --The type of friction that is generally greater. | --Static --Kinetic --Kinetic --Static |
| Choose the direction of the frictional force is horizontal, vertical, or neither: --You put a book up against a wall and push horizontally on the book so that it does not slide down the wall. --You push sideways on a bookcase that does not move. | --Horizontal --Vertical |
| Choose whether the direction of the frictional force is horizontal, vertical, or neither: --A box slides down a ramp. --You push sideways on a bookcase that does move. --A car accelerates from rest and speeds up on a flat horizontal road. | --Neither --Horizontal --Horizontal |
| T or F: Radial acceleration causes an object to turn and tangential acceleration causes an object to speed up or slow down. | True |
| T or F: The earth attracts you with a certain force and you attract the earth with exactly the same magnitude of force. | True |
| T or F: If you go far enough from the Earth, the force of gravity from the Earth acting on you will be zero. | False |
| If you wanted to calculate the acceleration of gravity (g=9.8 m/s2) what value would you use for the distance r in Newton's universal law of gravitation? | The radius of the earth |
| T or F: A person orbiting around the Earth in the space station feels weightless because there is no force of gravity acting on her. | False |
| Which of the following are in free fall? (Choose all that apply). | --An apple falling from a tree. --A dancer jumping through the air --A satellite in orbit --A motorcyclist performing an aerial stunt. |
| Consider two planets orbiting in circular orbits around a certain star. Which of the following is true? (Choose all that apply). | --The farther planet will always take longer to orbit than the closer planet. --The farther planet will always move slower than the closer planet. --The orbit of the farther planet will always be a longer distance than the orbit of the closer planet |
| When a comet orbits the sun, how does its speed depend on where it is in the orbit? | The speed is slower when the comet is far from the sun and faster when it is close to the sun. |
| Which of the following are the fundamental forces of nature? (Choose all that apply) | --Gravity --Electromagnetic --Strong nuclear --Weak nuclear |
| T or F: Energy can be transformed from one form to another or transferred from one system to another, but the total amount of energy does not change. | True |
| Are work and energy scalars or vectors? | Scalars |
| In which of the following circumstances is the work done by you not equal to zero? | You carry a box up a hill at a constant velocity. |
| Which of the following must occur if a force is to to work on an object? | --The object must move. --The force must be applied to the object. --The direction of the force vector must have a component parallel to the direction of motion. |
| T or F: The work done on an object is always positive and the work done by an object is always negative. | False |
| T or F: It is possible some forces to do work on an object even if there is no net work done on the object. | True |
| What variable in the definition of kinetic energy was also found in our discussion of motion in Chapters 2-3? | Velocity |
| T or F: If the total work done on an object is not zero, the kinetic energy of the object will change. | True |
| Which of the following is a type of potential energy? | --Gravitational --Elastic |
| T or F: When something changes height its gravitational potential energy will change. | True |
| Potential energy can be associated with | conservative forces only. |
| ***** | ***** |
| When the rocket engines of a starship are suddenly turned off, while traveling in empty space far from any stars or planets, the starship will | move with a constant velocity |
| You are driving your car down a straight road at a constant velocity of 65 mph. What can you conclude about the forces acting on your car? | The total force pushing the car in the forward direction must be equal to the total force pushing the car in the backward direction. |
| An object has two forces of equal magnitude but opposite direction applied to it as shown. Which is true? <--[]--> | Ans: None of the Above A.) The object must be moving to the right B) The object must be moving to the left C) The object must not be moving D) The object is moving in some direction |
| An object has two forces of different magnitude but opposite direction applied to it as shown. Which is true about the object at the instant shown? <--[]--> | Ans: None of the Above A) The object must be moving to the right B) The object must be moving to the left C) The object must not be moving D) The object must be moving |
| An object has two forces of different magnitude but opposite direction applied to it as shown. Which is true? <--[]--> | The object must be accelerating to the right |
| A net force F is required to give a mass m an acceleration a. If a net force of 6F is applied to a mass 2m, what acceleration results. | 3a |
| Consider a person standing in an elevator that is moving upward at a constant velocity. The upward normal force N exerted by the elevator floor on the person is | Identical to |
| Consider a person standing in an elevator that is accelerating upward. The upward normal force N exerted by the elevator floor on the person is: | Larger Than |
| Consider a car at rest. We can conclude that the gravitational pull of the Earth on the car and the upward constant force of Earth on it are equal and opposite because | The net force on the car is zero (Newton’s second law) |
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