WGU C165 (Integrated Physical Sciences) Final Exam Questions and Answers - Latest Verified 2023/2024 (Graded A+)

Which of the following derived units do NOT measure speed? mm/min2 cm/day m/s km/hr Question 2 of 10 A non-zero net force is necessary to Question 3 of 10 Which of the following force statements is FALSE? A force is a push or a pull. A force can cause a change in motion. A force is not needed to cause acceleration. Acceleration is caused by a force. A force is always needed to cause an object to accelerate. Question 4 of 10 A car’s engine provides a force of 200 N forward, while a force of 150 N from air resistance acts to oppose the car’s motion. What is the net force and its direction on the car? 50 N, forward 350 N, backward 350 N, forward 50 N, backward The net force is 200 N – 150 N. This gives a positive force, indicating the forward direction. Question 5 of 10 Two tug boats attach their lines to a separate barges with the same masses in a shipping channel. If one tugboat pulls Barge A towards the west while the other tugboat pulls Barge B in the same direction applying twice as much force, which barge will accelerate more? Barge A Neither will accelerate. Barge B Neither, they will accelerate at the same rate. Barge B will accelerate twice as fast because acceleration is directly proportional to the applied force. Question 6 of 10 Which of the following statements regarding inertia is FALSE? Inertia is the tendency of an object to keep its same motion. Objects with less mass have less inertia. It is more difficult to cause objects with more inertia to change velocity. Objects with more inertia are easier to accelerate. Question 7 of 10 Inertia depends on an object’s mass. Mass alone determines an object’s inertia. Question 8 of 10 If you press your hand downward on a book lying on a table, the reaction force to your hand is . the table pushing up against your hand the book pushing up against your hand your hand pushing the book down against the table gravity pulling your hand downward Question 9 of 10 Which of the following is an INCORRECT statement regarding action-reaction forces? For every action there is an equal and opposite reaction. Objects that are interacting must be moving for Newton’s third law to apply to them. Both action and reaction forces are real forces. Action and reaction forces are always equal and opposite. Newton’s third law applies to both stationary and inanimate objects. Question 10 of 10 A driver uses a forklift to push a full cart of bricks halfway down an aisle with a force of 20 newtons. If the driver pushes an empty cart the rest of the way down the aisle using the same 20 newtons of force, how does the acceleration of the empty cart compare with that of the full cart of bricks? The acceleration of the empty cart will be less than that of the full cart because it has less mass. The acceleration will be the same. The acceleration of the empty cart will be more than that of the full cart because it has less mass. The acceleration will be zero. The acceleration is inversely proportional to mass, so the empty cart with less mass will have a greater acceleration than the full cart. FRICTION, GRAVITY, AND MOMENTUM Question 1 of 9 If the mass of an object is halved and its speed doubled, its momentum will . halve double increase by a factor of 4 not change Question 2 of 9 The law of conservation of total linear momentum states that . Any momentum lost by one object in a collision will be gained by the other. The total momentum in a system is different before and after a collision. The momentum of any object involved in a collision does not change. The type of collision determines whether or not the total momentum is conserved. Because the total momentum remains the same in a collision, the momentum lost by one object must be gained by the other. Question 3 of 9 Which of the following is a disadvantage of friction? Friction enables you to walk. Friction reduces the efficiency of engines and other machines by converting parts of their kinetic energy into heat. Air resistance of a parachute slows down the descent of a skydiver. Friction makes it possible for you to grasp items with your hand. Question 4 of 9 A brick is dragged across a concrete floor. The type of friction that acts between the brick and the floor is friction. kinetic static fluid rolling Kinetic friction acts between moving surfaces. Question 5 of 9 Why is an applied force necessary to keep most objects in our world moving at a constant velocity? Because the object’s weight acts to slow it down Because the natural tendency of any object is to come to rest Because a frictional force opposing motion acts on most objects Because a force is needed to accelerate an object Question 6 of 9 Which of the following statements is inaccurate about gravity? Only very large objects exert a gravitational force. Gravity is an attractive force. It would be impossible to walk without gravity. The force of gravity is what holds us to Earth’s surface. As far as we know, gravity exists between any two objects in the universe. Question 7 of 9 If we could stop a planet for just an instant and then let it go, what would happen to it? It would continue orbiting the sun. It would spiral away from the sun into space. It would fall into the sun. It would remain motionless. Question 8 of 9 Consider a box lying on a table. If another box is stacked on top of it, how will the gravitational force (weight) of the top box affect the frictional force between the bottom box and the table if someone pushes slowly on the lower box? The frictional force will remain the same. It is impossible to determine how the frictional force will change. The frictional force will decrease. The frictional force will increase. The added weight will increase the contact force between the bottom book and table, thus increasing the frictional force. Question 9 of 9 If the distance between Earth and sun were decreased, how would the gravitational force between them change? The gravitational force would increase. The gravitational force would decrease. The gravitational force would remain the same. The gravitational force does increase. The gravitational force is inversely proportional to the square of the distance between masses. CONSERVATION OF ENERGY