Section 1

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Your math book on top of your desk. The force from the desk pushing up on the book is equal to it weight because

Front

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Last updated

1 year ago

Date created

Mar 1, 2020

Cards (27)

Section 1

(27 cards)

Your math book on top of your desk. The force from the desk pushing up on the book is equal to it weight because

Front

Book is not accelerating

Back

You are watching a child is flying a kite at the park. The kite is hovering motionless in the sky, about 100m above the ground. The wind is blowing smoothly toward the east. The net force on the kite is

Front

Zero

Back

Your friend is driving you to Columbus. To pass the time you toss your keys up in the air and catch them. Over and over again. While the keys are in the air, your friend suddenly slams on the brakes. The keys go flying onto the dashboard. The reason this happens is

Front

there is no horizontal force on the keys, and there is no horizontal acceleration . The key's inertia cause them to move at a constant speed.

Back

You are seated at a table in the dining car on a train going to Washington DC. The train goes around a turn to the left, and you suddenly notice your drink sliding off to the right of you. The drink slides to the right because:

Front

The inertia of the glass wants to keep the drink moving in the same direction.

Back

In order for you to accelerate you must

Front

Have a net force on you

Back

You throw a ball straight up into the air. As it rises higher and higher into the air, the upward velocity gets smaller and smaller. At the maximum height the velocity is zero before it begins to fall back down. At the maximum height the acceleration is

Front

equal to 9.8(meters per second squared)(down)

Back

During the winter Olympics a ski-jumper slides quickly down a long ramp and jumps into the air. Ignoring any affects due to the air, after leaving the ramp the acceleration of the ski-jumper is

Front

down

Back

You are standing at the top of a tall cliff above a calm lake. You have two stones in your hand, one twice as heavy as the other, and you throw them together horizontally at the same speed. Both stones soon hit the water. Neglecting any air resistance, the heavier stone reaches the water

Front

at the same time and at the same place as the lighter stone

Back

Front

Back

Which of the following objects is definitely accelerating?

Front

A ball that was tossed straight up and is now motionless at its peak height.

Back

A whiffle ball and a baseball are exactly the same size, but the baseball weighs considerably more. If you drop a whiffle ball and a baseball exactly at the same time from the 2nd floor balcony of your apartment, the baseball will hit the ground first. This happens because

Front

The air resistance of the whiffle ball is the same as the baseball, but mass of the whiffle ball is smaller.

Back

A child is riding in a wagon tied to the family dog with a string. As the dog walks steadily forward on the level sidewalk, the wagon follows perfectly. Suddenly the dog leaps forward to chase a squirrel and the string snaps. The loaded wagon breaks the string because the loaded wagon has such a large

Front

Mass

Back

A volleyball player has just served the ball. As the ball travels forward horizontally through the air and neglecting air resistance, the volleyball is experiencing

Front

Zero forward force

Back

You are practicing shooting free throws at the basketball court. When you throw the ball, it travels in an arc toward the hoop. Ignoring any forces that air exerts on the ball, the net force on the ball just after it leaves you hand is

Front

Straight Down

Back

You have thrown a stone toward the pond in front of you and it is now at the highest point in its arc. Neglecting any forces due to air, the net force on the stone

Front

Points straight downward

Back

If you want to throw a ball as far as possible down a football field, you should throw the ball

Front

at an angle of 45 degrees

Back

You are carrying your book-bag and riding a bus up a long hill at a constant velocity. Which of the following is NOT true:

Front

You are doing zero work to your backpack

Back

You shoot an arrow straight up, using a bow. Naturally, you run away before it comes back down. While the arrow is heading upward, but no longer touching the bow, the net force on it is

Front

downward and it is accelerating downward

Back

Which of the following is NOT accelerating?

Front

A car traveling straight forward on a level road at a steady speed.

Back

You are twirling a ball tied to the end of a string around your head. If the string breaks while the ball is directly to your right and moving forward, the ball will go:

Front

Straight Ahead

Back

Two identical balls roll off a horizontal desk at exactly the same moment. One ball is traveling horizontally twice as fast as the other at the moment the two leave the desk. Compared to the slower ball, the faster ball hits the ground

Front

at the same time, but at twice the horizontal distance

Back

An arrow is heading toward its target after leaving the archer's bow. Neglecting any effects due to air, the net force on the arrow

Front

Points directly downward

Back

You're playing darts. You find that the slower you throw a dart, the higher you have to aim in order to hit the center of the dart board. That's because the slow moving dart

Front

Has more time to fall

Back

A heavy vase rests motionless on the floor. The vase is experiencing its weight downward and an equally strong force upward from the floor. We know that these two forces on the vase are equal in amount but oppositely directed because

Front

The vase is not accelerating so the two forces must sum to zero.

Back

When you drop a ball from a 2nd story balcony (ignoring any affects due to the air) it accelerates as it falls. The reason it accelerates is

Front

the only force on the ball is its weight

Back

A speedboat is pulling a water-skier with a rope, exerting a large forward force on her. The skier is traveling forward in a straight line path at a constant speed. The net force experienced by the skier is

Front

Zero

Back

You are on a hayride: a horse-drawn cart with a flat top that is covered with hay. The cart has stopped to wait for a cow to cross the road and you have decided to stand up. Suddenly, the horse leaps forward and pulls the cart hard. Seconds later, you find yourself on the ground behind the cart because

Front

Your inertia kept you motionless

Back