Physics Lab Pretest

When we add a displacement vector to another displacement vector, the result is:

Another displacement

Which of the following is true?

Astronauts in space can be weightless.

Suppose the Sun shrank in size but its mass remained the same. What would happen to the orbit of Earth?

Earth's orbit would be unaffected.

The fact that Voyager 1 continues to speed out of the solar system, even though its rockets have no fuel, is an example of

Newton's first law of motion.

Which of the following expresses a principle, which was initially stated by Galileo and was later incorporated into Newton's laws of motion?

The natural condition for a moving object is to remain in motion.

If we know that a nonzero net force is acting on an object, which of the following must we assume regarding the object's condition? The object is:

being accelerated

In a 2 dimensional Cartesian system, the x-component of a vector is known, and the angle between vector and x-axis is known. Which operation is used to calculate the magnitude of the vector? (taken with respect to the x-component)

dividing by cosine

According to the first law of thermodynamics, the sum of the heat gained by a system and the work done on that same system is equivalent to which of the following?

internal energy change

Which of the following is that form of energy associated with an object's motion?

kinetic

The impulse experienced by a body is equivalent to its change in:

momentum

An adiabatic expansion refers to the fact that:

no heat is transferred between a system and its surroundings.

Which of the following is that form of energy associated with an object's location in a conservative force field?

potential

During an isobaric process which one of the following does not change?

pressure

The value of an object's acceleration may be characterized in equivalent words by which of the following?

rate of change of velocity

Heat flow occurs between two bodies in thermal contact when they differ in what property?

temperature

Which best describes a system made up of ice, liquid water and steam existing together?

triple point

Displacement is which of the following types of quantities?

vector

Which type of quantity is characterized by both magnitude and direction?

vector

Newton's Laws of Motion and Newton's Law of Gravity explain why

- the Earth moves around (orbits) the Sun. - the Moon moves around Earth. - an apple from a tree falls down to ground (as opposed to "rising up into the sky").

If you could go shopping on the Moon to buy an amount of chocolate that weighs a pound, you'd get a lot more chocolate than if you bought a pound on Earth.

Yes, because of the lower gravity on the Moon, it would take more chocolate to weigh a pound than on Earth.