Physical Science Chapter 1-3 Test

compared with falling on a wooden floor, a wine glass may not break when it falls on a carpeted floor because of

longer time to stop

a kilogram is a measure of an object's

mass

when a cannon fires a cannonball at a given speed, the smaller recoil speed of the cannon is due to different

masses

a mack truck and a mini cooper traveling at the same speed collide head-on. the vehicle to undergo the greatest change in velocity will be the

mini cooper

you would have the largest mass of gold if it weight 1N on the

moon

a dog and a mouse run along a road with the same kinetic energy. the faster runner is the

mouse

a falling object that has reached its terminal speed continues to gain

neither acceleration nor speed

the power expended for a barbell raised 2 m in 2 sec is

not enough inormation

if you push for an hour against a stationary wall, you do no work

on the wall

a rock is thrown vertically upward. at the top of its straight-line path the force acting on it is

only the force due to gravity

According to Galileo, inertia is a

property of all matter

a 5-kg fish swimming at speed of 1 m/s swallows an absent-minded 1-kg fish at rest. The speed of the larger fish after lunch is

5/6 m/s

a girl pushes a cart to the left wit a 100-N force. A boy pushes it to the right with a 50-N force. the net force exerted on the cart is

50 N to the left

a diver who weighs 500 N steps off a diving board 10 m above the water hits the water with kinetic energy of

5000 J

a skydiver who weighs 500N reaches terminal velocity at 90 km/h. the air resistance on the skydiver is

500N

a 5000-kg freight car at rest. they couple upon collision and move with a speed of 2 m/s. what was the initial speed of the 5000-kg freight car?

6 m/s

a skydiver who weighs 600 N reaches terminal velocity at 80 km/h. the air resistance on the skydiver is

600N

a 10N falling object encounters 4N of air resistance. the net force on it is

6N

a 2-kg mass weighs 20N and is held 4 m above the ground. Its potential energy relative to the ground is

80J

a car moves 3 times as fast as another identical car. compared with the slower car, the faster car has

9 times the kientic energy

a shopping cart moves with a kinetic energy of 40J. if it moves at twice the speed, its kinetic energy is

160 J

if you exert 100 J in 50 sec and your power output is

2 W

a sandbag in outer space moves at 3 m/s when it collides and sticks to a half-as-massive sandbag initially at rest. Compared with the kinetic energy of the moving sandbag before collision, the kinetic energy of the coupled sandbags after collision is

2/3

at the end of two seconds of free fall, an object released from rest will have a speed of

20 m/s

a tow truck exerts a force of 4000N on a car that accelerates at 2 m/s^2. the mass of the car must be

2000 kg

a 1000 kg car moving at 10m/s that brakes to a stop in 5 s has an average braking force of

2000N

what applied horizontal force will accelerate a 400-kg crate a 1m/s^2 across a factory floor against a friction force half its weight?

2000N

a 50N object falling in air experiences 30N of air resistance. The amount of net force on the falling object is

20N

when you are in the way of a fast-moving object and can't get escape, you will suffer a smaller force if the collision time is

long

if gravity between the Sun and Earth suddenly vanished, Earth would continue moving in

a straight-line path

when you step off a bus moving at 10m/s, your horizontal speed when you meet the ground is

about 10m/s

If the mass of an object does not change, a constant net force on the object produces constant

acceleration

a skydiver steps from a helicopter and falls for 5s before reaching terminal velocity. During this 5 sec interval, he acceleration

decreases

when an object falls through the air and gains velocity, the net force actually

decreases

a tutor will be correct in saying that velocity and acceleration are

different concepts

which one of the following choices is a vector quantity?

displacement

a freight train rolls along a track with considerable momentum. if it rolls at the same speed but has twice as much mass, its momentum is

doubled

when you toss a coin straight up, it moves upward, turns around, and drops. During this time the acceleration of the coin is

downward adn constant

when you toss a coin straight up, it moves upward, turns around, and drops. During this time the acceleration of the coin is

downward and constant

an object in motion tends to remain in motion

due to their nature

when you toss a coin straight up, it moves upward, turns around, and drops. During this time the velocity of the coin is

first decreasing, then increasing

if you do work on an object in double the time, your power output is

half

when a crate slides down an incline at a constant velocity it is

in dynamic equillibrium

during each second of free fall, the speed of an object

increases the same amount

compared with a 1-kg block of solid iron, a 2-kg block of solid iron has twice as much

inertia, mass, and volume

if a rhinoceros has momentum, it must also have

kinetic energy

a ball is thrown vertically upward. because of air resistance, its speed when returning to its starting level compared with it's initial speed is

less

an object has potential energy because of its

location

an object may have potential energy because of its

location

a 50-kg sack is lifted 2 m in the same time as a 25-kg sack is lifted 4 m. the power expended in raising the 50-kg sack compared to the power used to lift the 25-kg sack is

the same

a force of 1N accelerates a 1-kg mass at 1m/s^2. the acceleration of a 2-kg mass acted upon by a force is 2N is

the same

compared with the mass of a certain object on Earth, the mass of the same object on the Moon is

the same

you're driving down the highway and a ladybug spatters onto your windshield. which undergoes the greater impulse?

the same

when you push a crate across a level floor at constant speed, friction between the crate and the floor is

the same amount as your pushing force

a roller coaster car at an amusement park carrying 1 passenger takes 3 min to make its ride from start to finish. Neglecting friction, a car with 5 passengers would take

the same time

an object lifted 10 m gains a certain amount of potential energy. if it is lifted 20 m, its gain in potential energy is

twice as much

when you stand at rest on a floor, the number of vertical forces acting on you is

two

as an object freely falls, its

velocity increaseds

Drop a rock from a 5-m height and it accelerates at 10 m/s2 and strikes the ground in

1 second

Nellie runs the length of a 100-yard football field in a time of 20 seconds. Her average running speed is

5 yards/s

a 10-N falling object encounters 10 N of air resistance. the net force on it is

0 N

two billiard balls having the same mass roll toward each other at the same speed. what is the net momentum of the two-ball system?

0 kg.m/s

two identical freight cars roll without friction towards each other on a level track. one car rolls at 2 m/s and the other car rolls at 1 m/s. After the cars collide, they couple and roll together with a speed of

0.5 m/s

when a skydiver of mass 100 kg experiences air resistance of 400N, her acceleration is

0.6g

when a 20-N object is suspended at rest by a two vertical strands of rope, the tension in each rope is

10 N

the gain in speed each second for a freely falling object is about

10 m/s

A push on a 1 kg brick accelerates the brick. Neglecting friction, to equally accelerate a 10 kg brick requires the force to be

10 times as much

a tow truck exerts a force of 3000N on a car that accelerates a 2 m/s^2. the mass of the car must be

1000 Kg

when a baseball player hits a ball with a force of 1000 N, the ball exerts force on the bat of

1000 N

when a baseball player hits a ball with a force of 1000N, the ball exerts force on the bat of

1000N

a 1-kg mass at Earth's surface weights about

10N

the force of friction on a sliding object is 10N. The applied force needed to maintain a constant velocity is

10N

a rock is thrown vertically into the air. at the top of its path, its acceleration is

10m/s^2

a ball is moving at 4 m/s and has a momentum of 48 kg.m/s. what is the ball's mass?

12 kg

a 4-kg ball has a momentum of 12 kgxm/s. what is the ball's speed?

3 m/s

a man weighing 800N stands at rest on two bathroom scales so that one scale shows a reading of 500N. the reading on the other scale is

300 N

a karate chop breaks a board with a blow of 3000N. the force that acts on the hand during this event is

3000N

the average speed of a deer traveling a distance of 2 km in a time of one-half hour is

4 km/hr

a music console is pushed a distance of 2 m with a force of 20 N. the work done on the console is

40 J

a jumbo jet has a mass of 100,000 kg. the thrust for each of its 4 engines is 50,000N. the acceleration of the jet when taking off is

4m/s^2

if a ball rolls down an inclined plane and picks up 4m/s each second it rolls, its acceleration is

4m/s^2

an object is pulled with two forces, 10 N northward and 15 N southward. the magnitude of the net force is

5 N

an object is pulled with two forces, 10 N northward and 15N southward. The magnitude of the net force is

5 N

which has zero acceleration?

an object at rest, an object moving at constant velocity, an object in mechanical equilibrium

a given net force propels an object along a straight-line path by a force. if the mass were doubled, its acceleration would

be half

it is correct to say that impulse is equal to

change in momentum

Galileo's demonstration at the Leaning Tower of Pisa..

refuted Aristotle's teachings.

a mack truck and a mini cooper traveling at the same speed collide head-on. the Collison force is greatest on the

same

a mack truck and a mini cooper traveling at the same speed collide head-on. the collision force is greatest on the

same

which one of the following statements is true concerning scalar quantities?

scalar quantities can be added to other scalar quantities using rules of ordinary addition

from the same height you simulataneously drop a lightweight tennis ball and a heavyweight bowling ball. when they hit the floor they have the same

speed

it is correct to say that impulse is equal to

the change in momentum

your weight is

the gravitational attraction between you and Earth