Physics Practice test #1

For the astronauts inside the orbiting space shuttle, there is no force of Earth gravity acting on them. This statement is: A. always false B. sometimes true while in orbit C. always true while in orbit

A. always false

According to Newton, doubling the distance between tow iteracting objects: A. divides by four the gravitation force between them B. divided by two the gravitation force between them C. multiplies by four the gravitational force between them D. multiplies by two the gravitational force between them

A. divides by four the gravitational force between them

Your pet hamster sits on a record player whose angular speed is consant. If he moves to a point twice as far from the center, then his linear speed: A. doubles B. remains the same C. halves

A. doubles

Whirl a rock at the end of a string and it follws a circular path. If the string breaks, the tendency of the rock is to: A. follow a straight line path B. increase its speed C. continue to follow a circular path D. revolve in a smaller cirlce

A. follow a straight line path

A rifle recoils while firing a bullet. The speed of the rifle's recoil is small becuase the: A. rifle has much more mass than the bullet B. force against the rifle is smaller than against the bullet C. momentum in mainly concentrated in the bullet D. momentum of the rifle is smaller

A. rifle has much more mass than the bullet

A mack truck and volkswagen traveling at the same speed have a head-on collision. the vehicle that undergoes the greatest change in velocity will be the: A. volkswagen B. mack truck C. same for both

A. volkswagen

If a projecti;e os fored straight up at a speed of 10 m/s, the total time to return to its starting position is about: A. 2 seconds B. 1 second C. 20 seconds D. 10 seconds E. not enough information to estimate

B. 1 second - g is 10 m/s

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

B. 2000 N

When you jump from an elevated position you usually bend your knees upon reaching the ground. By doing this, you make the time of impact about 10 times as great as for a stiff-legged landing. In this way the average force your body experiences is: A. more than 1/10 as great B. about 1/10 as great C. less than 1/10 as great D. about 10 times as great

B. about 1/10 as great

Your friend says that the heavyweight champion of the world cannot exert a force of 50 N on a piece of tissue paper with his best punch. The tissue paper is heald in midair- no wall, no tricks. You: A. have reservations about this assertion B. agree that it can not be done C. disagree, for a good punch easily delivers this much force

B. agree that it can not be done

A coin and a ring roll down an incline starting at the same time. The one to reach the bottom first will be the: A. ring B. coin C. both will reach the bottom at the same time

B. coin - coin has more mass towards the center

According to Kepler's laws, the paths of planets about the sun are: A. circles B. ellipses C. parabolas D. straight line E. none of these

B. ellipses

A sheet of paper can be withdrawn from under a container of milk without toppling it if the paper is jerked quickly. This best demonstrates that: A. the milk carton has no acceleration B. the milk carton has inertia C. there is an action-reaction pair of forces D. gravity tends to hold the milk carton secure E. none of these

B. the milk carton has inertia

The attraction of a person's body toward the Earth is called weight. Teh reaction to this force is: A. the Earth's surface pushing against the person's body B. th person's body pulling on the Earth C. the person's body pushing against the Earth's surface D. none of these

B. the person's body pulling on the Earth

A sack of potatoes weighing 200 N falls from an airplane. As the velocity of fall increases, air resistance also increases. When air resistance equals 200 N, the sack's acceleration in meters per second per second is: A. 4.9 B. 9.8 C. 0 D. infinite E. none of these

C. 0

An apple falls from a tree and hits the ground 5 meters below. It hits the groud with a speed of about: A. 15 m/s B. 5 m/s C. 10 m/s D. 20 m/s E. not enough information given to estimate

C. 10 m/s

A 4 kg ball has a momentum of 12 kg m/s. What is the balls speed? A. 4 m/s B. 48 m/s C. 3 m/s D. 12 m/s E. none of these

C. 3 m/s - 12kg m/s/4kg = 3m/s

An object is pulled northward by a force of 10 N and at the same time another force of 15N pulls it southward. The magnitude of the resultant force on the object is: A. 25 N B. 150 N C. 5 N D. 0 N

C. 5 N

What task requires the most work; lifting a 50-kg sack 2 meters or lifting a 25-kg sack 4 meters? A. the 50-kg sack B. the 25-kg sack C. both requre the same amount of work D. impossible to determine without knowing the contents of the sack

C. both require the same amount of work

Arnold Strongman and Suzie Small each pull very hard on opposite ends of a massless rope in a tug-of-war. The greater force on the rope is exerted by: A. Arnold B. Suzie C .both the same

C. both the same

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

C. exactly below the midpoint of the ceiling

If the speed of a moving object doubles, which of the following also doubles? A. kinetic energy B. acceleration C. momentum D. all of the above:

C. momentum

The last instant just before an airplane crashes a passenger jumps out the door and falls only 2 feet to the ground. the passenger is: A. intelligent to think so fast B. lucky to have studied physics C. probably hurt or killed D. unharmed

C. probably hurt or killed

It is correct to say that impulse is equal to: A. momentum B. the force multiplied by the distance the force acts C. the change in momentum D. velocity multiplied by time

C. the change in momentum

An object lifted 10 meters gains 200 J of potential energy. If the same object is lifted 20 meters, its potential energy gain is: A. the same B. half as much C. twice as much D. four times as much E. more than four times as much

C. twice as much

A 1-kg chunk of putty moving at 1 m/s collides with and sticks to a 5-kg bowling ball initially at rest. The Bowling ball and putty then move with a momentum of: A. 0 kg m/s B. 2 kg m/s C. 5 kg m/s D. 1 kg m/s E more than 5 kg m/s

D. 1 kg m/s

If a car increases its velocity from zero to 60 km/h in 10 seconds, its acceleration is: A. 600 km/h/s B. 10 km/h/s C. 60 km/h/s D. 6 km/h/s E. 3 km/h/s

D. 6 km/h/s - 60km/h / 10s = 6 km/h/s

A heavy object and a light object are dropped at the same time from rest in a vaccum. The heavier object reaches the ground: A. later than the lighter object B. almost immediately C. sooner than the lighter object D. at the same time as the lighter object

D. at the same time as the lighter object

On a given day, tides rise and fall at: A. the same time everywhere B. different times and different distances almost everywhere C. the same distance everywhere D. the same time and the same distance everywhere

D. different times and different distances almost everywhere

While a car travels around a circular track at a constant speed its: A. velocity is zero B. inertia is zero C. acceleration is zero D. none of the above

D. none of the above

compared to the mass of a certain object on Earth, the mass of the same object on the moon is: A. six times as much B. zero C. one sixth as much D. the same

D. the same

A hockey puck is set in motion across a fozen pond. If ice friction and air resistance are neglected, the force required to kee the puck sliding at constant velocity is: A. equal to the product of its mass times its weight B. equal to its weight divided by its mass C. equal to its weight D. zero

D. zero - and object in motion stays in motion

The famous Leaning Tower of Pisa doesn't topple over because its center of gravity is: A. dispalced from its center B. in the same place as its center of mass C. stabilized by its structure D. relatively low for such a tall building E. above a place of support

E. above a place of support

If the radius of the Earth somehow decreased with no change in mass, your weight would A. increase B. decrease C. not change

A. increase

When a twirling ice skater brings her arm inward her rotational speed: A. increases B. remains the same C. decreases

A. increases

If an object has kinetic energy, then it also must have: A. momentum B. impulse C. force D. acceleration E. none of these

A. momentum

Do 100 J of work in 50 s and your power output is: A. 2 W B. 50 W C. 5,000 W D. 4 W E. 1/2 W

A. 2 W - 100J/50s = 2 W

A man weighing 800 N stands at rest on two bathroom scales so that his weight is dsitributed evenly over both scales. The reading on each scale is: A. 400 N B. 200 N C. 800 N D. 1600 N E. none of the above

A. 400 N

Put a pipe over the end of a wrench when trying to turn a stubborn nut on a bolt, to effectively make the wrench handle twice as long, you'll multiply the torque by: A. 4 B. 2 C. 8

B. 2

The earth pulls on the moon. Similarliy the moon pulls on the Eath, evidence that: A. the earth is larger so its pull is larger B. larger objects pull harder C. these two pulls comprise an action-reaction pair D. the moon is smaller so its pull is smaller

c. these two pulls comprise an action-reaction pair