Physics Chapter 2 and 4 Multiple Choice

A ball is thrown vertically into the air. Because of air resistance, its speed when it returns to its starting level compared with its initial speed is A) less B) the same C) more

A

A coconut and a feather fall from a tree through the air to the ground below. The amount of air-resistance force on each object just before hitting the ground is A) greater on the coconut B) greater on the father C) the same on each

A

A truck is moving at constant velocity. Inside the storage compartment, a rock is dropped from the midpoint of the ceiling and strikes the floor below. The rock hits the floor A) exactly below the midpoint of the ceiling B) ahead of the midpoint of the ceiling C) behind the midpoint of the ceiling D) More information is needed to solve this problem E) none of these

A

The mass of a pet turtle that weighs 10 N is A) about 1 kg B) about 10 kg C) about 100 kg D) about 1000 kg E) none of these

A

The newton is a unit of A) force B) mass C) density D) inertia

A

A girl pulls on a 10-kg wagon with a constant horizontal force of 30 N. If there are no other horizontal forces, what is the wagon's acceleration in m/s^2? A) 0.3 B) 3.0 C) 10 D) 30 E) 300

B

A ride on a roller-coaster car containing 6 passengers take 3 minutes. Neglecting friction, a similar ride when 12 passengers aboard would take A) 1.5 minutes B) 3 minutes C) 6 minutes D) 18 minutes

B

An object following a straight-line path at constant speed A) has a net force acting upon it in the direction of motion B) has zero acceleration C) has no forces acting on it D) none of these

B

The maximum acceleration of a car while towing a second car twice its mass, compared to its acceleration with no car in tow, is A) one half B) one third C) one fourth D) the same E) none of these

B

A 300 kg bear grasping a vertical tree slides down at constant velocity. The friction force between the tree and the bear is A) 30 N B) 300 N C) 3000 N D) more than 3000 N

C

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 larger than zero C) about 30 m/s D) more than 30 m/s E) More information is needed for an estimate

C

An object's weight may properly be expressed in units of A) meters B) kilograms C) newtons D) cubic centimeters

C

If a non-rotating object has no acceleration, then we can say for certain that it is A) at rest B) moving at constant non-zero velocity C) in mechanical equilibrium D) all of these E) none of these

C

The force of friction on a sliding object is 10 newtons. The applied force needed to maintain a constant velocity is A) more than 10 N B) less than 10 N C) 10 N

C

Two factors that greatly affect air resistance on falling objects are the A) size and mass of the object B) size and weight of the object C) size and speed of the object D) roham and acceleration of the object

C

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

C

When you stand at rest on a pair of bathroom scales, the readings on the scales will always A) each be half your weight B) each equal your weight C) add up to equal your weight

C

A 500-N parachutist opens his chute and experiences an air resistance force of 800 N. The net force on the parachutist is A) 300 N downward B) 500 N downward C) 800 N downward D) 300 N upward E) 500 N upward

D

A car has a mass of 1000 kg and accelerates at 2 m/s^2. What is the magnitude of the net force exerted on the car? A) 500 N B) 1000 N C) 1500 N D) 2000 N E) none of these

D

A lightweight feather slides off a table and falls through the air until it reaches the floor. During the time of its fall, its acceleration A) keeps increasing B) keeps decreasing C) never changes D) is sometimes zero

D

A skydiver steps from a helicopter and falls for a few seconds until he reaches his terminal velocity. Thereafter, until he opens his parachute, his acceleration A) is constant B) increases C) decreases D) is zero E) none of these

D

An object in mechanical equilibrium is an object A) at rest B) moving with constant velocity C) having no acceleration D) all of these

D