Chapter 2

c. inertia

A sheet of paper can be quickly jerked beneath a container of milk without toppling, which best demonstrates a. net force b. the difference between force adn mass c. inertia

B. Copernicus (was the first scientist to be credited for postulating Earth circled the sun)

The first scientist to be credited for postulating Earth circled the sun was a. Aristotle b. Copernicus c. Galileo D. Newton

B. Galileo (was the first scientist to introduce the concept of inertia)

The first scientist to introduce the concept of inertia a. Aristotle b. Galileo c. Newton D. Copernicus

c. follow a straight line path

When a rock at the end of a string follows a circular path. If the string breaks, the tendency of the rock is to a. follow a circular path b. slow down c. follow a straight line path d. stop

c. no longer gains speed

When a rocket ship gaining speed in outer space runs out of fuel, it A) gains speed for a short time, then slows down to a constant velocity. B) gains speed for a short time, slows down, and eventually stops. C) no longer gains speed.

a. straight lines

When no forces act on an moving objects their paths are normally a. straight lines b. circles c. ellipses d. all of the above

a. inertia

When you flick a card from beneath a coin that hardly moves, your illustrating a. inertia b.equilibirum c. support force d. friction

D. Inertia

Which concept is being illustrated when a table cloth is quickly yanked beneath dishes resting on a table? a. equilibirum b. friction c. support force d. inertia

d. a straight-line path

if gravity between the Sun and earth suddenly vanished, Earth would continue moving in a. a curved path b. an outward spiral path c. an inward spiral path d. a straight-line path

c. none of these

the amount of force needed to stustain motion of a rock in outer space is a. a force equal to its weight b. a force less than its weight if friction is absent c. none of these

d. none of the above

A hockey puck is set in motion across a frozen pond. If ice friction and air resistance are neglected, the force required to keep the puck sliding at constant velocity is a. equal to its weight b. equal to its weight divided by it smass c. equal to its mass times its weight d. none of the above

b. of friction

A hockey puck sliding across the ice finially comes to rest because a. it seeks its proper and natural state b. of friction c. thats just the way it is

b. exactly below the midpoint of the ceiling

A moving van with a stone lightly glued to the midpoint of its ceiling smoothly moves at constant velocity. When the glue gives way, the stone falls and hits the floor A) ahead of the midpoint of the ceiling. B) exactly below the midpoint of the ceiling. C) behind the midpoint of the ceiling. D) none of the above

c. about 30 m/s

A package falls off a truck that is moving at 30 m/s. Neglecting air resistance, the horizontal speed of the package just before it hits the ground is a. zero b. less than 30 m.s but more than zero about 30 m/s d. more than 30 m/s

b. 3 minutes

A roller-coaster ride with 6 passengers takes 3 minutes. Neglecting friction, a similar ride with 12 passengers aboard would take a. 1.5 minutes b. 3 minutes c. 6 minutes d. 18 minutes

B. Keep rolling if friction is absent (Galileo taught us that if you roll a ball along a level surface it will do this)

Galileo taught us that if you roll a ball along a level surface it will a. soon slow down due to its natural place b. keep rolling if friction is absent c. roll as long as its inertia nudges it along d. soon roll in the opposite direction

B. rates of time

Galileo's interpretation of motion differed from Aristotle's in that Galielo emphasized a. the acceleration of free fall b. rates of time c. the role of distance in describing motion d. none of the above

A. Slow down the ball's changes in speed (galileo's use of inclined planes allowed him to effectively do this)

Galileo's use of inclined planes allowed him to effectively a. slow down the ball's changes in speed b. reduce the time of the ball's changes in speed c. eliminate all changes in speed d. eliminate friction

A. continue moving at the same speed

If no external force acts on a moving object, it will a.continue moving at the same speed b. move slower and slower until it finally stops c. come to an abrupt halt d. none of the above

A. inertia

If your automobile runs out of fuel while driving, the engine stops. You don't come to an abrupt stop due to a. inertia b. gravity c. resistance d.the principle of continuation

B. Property of matter (inertia is defined as)

Inertia is defined as a. force b. property of matter c. change in motion d. none of the above

B. Experiment over philosophical discussions

Science later greatly advanced when Galileo favored a. philosophical discussions over experiment b. experiment over philosophical discussions c. mathematical thinking d. none of the above