FREE AND STUDY GAMES ABOUT PHYSICS EXAM

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FREE AND STUDY GAMES ABOUT PHYSICS EXAM

QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -54 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation Question 1: Which of the following must occur if a force is to to work on an object?

Answer:

--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.Question 2: 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.

Answer:

False Question 3: T or F: When something changes height its gravitational potential energy will change.

Answer:

True

Question 4: 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

Answer:

Mass Weight Weight Mass Question 5: 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.

Answer:

True Question 6: What variable in the definition of kinetic energy was also found in our discussion of motion in Chapters 2-3?

Answer:

Velocity Question 7: Which of the following are the fundamental forces of nature? (Choose all that apply)

Answer:

--Gravity --Electromagnetic --Strong nuclear --Weak nuclear

Question 8: 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:

Answer:

Larger Than

Question 9: 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

Answer:

move with a constant velocity

Question 10: Is force a scalar or a vector?

Answer:

Vector Question 11: Newton's second law and the equations in Chapter 2 both include the concept of

Answer:

Acceleration Question 12: 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.

Answer:

True Question 13: 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.

Answer:

False Question 14: T or F: Radial acceleration causes an object to turn and tangential acceleration causes an object to speed up or slow down.

Answer:

True Question 15: When a comet orbits the sun, how does its speed depend on where it is in the orbit?

Answer:

The speed is slower when the comet is far from the sun and faster when it is close to the sun.

Question 16: 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.

Answer:

False Question 17: 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

Answer:

The net force on the car is zero (Newton's second law) Question 18: Consider two planets orbiting in circular orbits around a certain star. Which of the following is true? (Choose all that apply).

Answer:

--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 Question 19: Which of the following could contribute to the net radial force that causes a centripetal acceleration?

Answer:

Gravity, Tension, Friction, & Normal.

Question 20: 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?<--[]-->

Answer:

Ans: None of the Above

• The object must be moving to the right

• The object must be moving to the left

• The object must not be moving

• The object must be moving