Physics Chap 7 Review

At the top of a loop of a roller coaster, the centripetal force is caused by

• torsion

• magnetism
• gravity

• friction

Answer explanation

read p. 162 of the textbook

The scientists who calculated the density of the earth was

• Isaac Newton
• Galileo Galilei
• Archimedes

• Cavendish

the time it takes for one heavenly body to make one complete revolution around another heavenly body is called its

• stellar rotation
• celestial cycle
• galactic orbit
• orbital period

The observation that a solar system body moves in its orbit at varying speeds depending on its distance from the sun is Kepler's

• first law
• third law
• fourth law
• second law

Ptolemy added the concept of ______ to Aristotle's model to explain retrograde motion.

• epicycles
• eccentricity
• orbits
• ellipses

The vector quantity that causes rotational acceleration of a rigid system is called

• force
• torque
• velocity
• momentum

The force on a revolving object that causes it to accelerate is

• centrifugal force

• frictional force
• centripetal force
• tangential force

The change in the angle of circular motion is analogous to _____ in linear motion

• displacement
• force
• acceleration
• velocity

The rate of change of angular speed with respect to time is called

• angular acceleration

• centripetal acceleration

• tangential acceleration

• rotational acceleration

In circular motion, position vectors and velocity vectors are _____ to one another

• opposite
• perpendicular
• tangent
• parallel