Exam 3: Laws of Motion

Which of Newton's Laws states that if an unbalanced force acts on an object,then the object's motion changes?

What is required to change an object's motion?

What is your acceleration if you go from 0 to 60 mph in 4 seconds?

__________ hypothesized that planetary motions could be explained by a force arising from the attraction between the mass of the planet and Sun that decreased with the square of the distance between them.

A satellite is a less massive object in free fall around a more massive object.

If you weighed 150 lbs on Earth,what would you weigh on Mars? For reference,Mars has a mass that is 0.1 times the Earth's mass and Mars has a radius that is 0.5 times the Earth's radius.

An unbound orbit results when a satellite has a velocity greater than the escape velocity.

Which of the following did NOT require the use of a telescope to observe?

Which of the following properties of an astronaut changes when he/she is standing on the Moon,relative to when the astronaut is standing on Earth?

To find the mass of Jupiter,we only need to know the semimajor axis and period of one of its moons.

An astronaut orbiting the Earth in a circular orbit at a constant speed does not feel the force of gravity because his/her acceleration is zero.

Which scientist ended up under house arrest due to his support of the heliocentric model?

More massive objects fall faster in the Earth's gravitational field than less massive objects.

In the figure below,draw an arrow representing the direction of the acceleration in each case.If the acceleration is zero,write zero.

If the distance between the Earth and Sun were cut in half,the gravitational force between these two objects would:

What two pieces of information do we need to know about the Earth in order to calculate the mass of the Sun?

The only acceleration you experience on a merry-go-round is when it starts or stops.

Isaac Newton was the first scientist to use a telescope for astronomical discoveries.

Gravity holds planets in orbit.

The figure below shows Newton's cannonball thought experiment.At the three locations of the cannonball shown,draw and label arrows representing the circular velocity and acceleration.