Chapter 4 Test Linear Motion Physics - Joseph Morsaw | Biblioteka

2

Speed is...

a measure of how fast something is moving.

always measured in terms of a unit of distance divided by a unit of time.

all of the choices.

the distance covered per unit time.

2

One possible unit of speed is

light years per century.

miles per hour.

all of the choices.

kilometers per hour.

2

When you look at the speedometer in a moving car, you can see the car's

2

Acceleration is defined as the CHANGE in

velocity divided by the time interval.

time it takes to move from one place to another place.

velocity of an object.

time it takes to move from one speed to another speed.

distance divided by the time interval.

2

Suppose you are in a car that is going around a curve. The speedometer reads a constant 30 miles per hour. Which of the following is NOT true?

Your speed is constant.

Your direction is constantly changing.

Your velocity is constant.

Your acceleration is constantly changing.

You and the car are accelerating.

2

A cyclist travels 13 meters in the 1st second of travel, 13 meters again during the 2nd second of travel, and 13 meters again during the 3rd second. Its acceleration is

2

Suppose an object is in free fall. Each second the object falls

with the same average speed.

none of the choices.

with the same instantaneous speed.

the same distance as in the second before.

a larger distance than in the second before.

2

A ball tossed vertically upward rises, reaches its highest point, and then falls back to its starting point. During this time the acceleration of the ball is always

directed downward.

directed upward.

in the direction of motion.

opposite its velocity.

2

As an object falls freely in a vacuum, its

velocity increases.

both A and B.

none of the choices.

acceleration increases.

2

In the absence of air resistance, objects fall at constant

2

A ball is thrown upwards and caught when it comes back down. In the absence of air resistance, the speed of the ball when caught would be

the same as the speed it had when thrown upwards.

more than the speed it had when thrown upwards.

less than the speed it had when thrown upwards.

2

If you drop a feather and a coin at the same time in a tube filled with air, which will reach the bottom of the tube first?

Neither—they will both reach the bottom at the same time.

The coin

The feather

2

If you drop a feather and a coin at the same time in a vacuum, which will reach the bottom of the tube first?

The coin

Neither—they will both reach the bottom at the same time.

The feather

2

Consider drops of water leaking from a water faucet. As the drops fall they

get closer together.

get farther apart.

remain at a relatively fixed distance from each other.

2

The hang time (time one's feet are off the ground in a jump) for most athletes is

less than 1 second.

about 1 second.

considerably more than 1 second.

slightly more than 1 second.

2

When a basketball player jumps to make a shot, once the feet are off the floor, the jumper's acceleration

depends on launch speed.

depends on all the above.

is usually greater for taller players (but not always).

is g; no more, no less.

varies with body orientation.

2

When something falls to the ground, it accelerates. This acceleration is called the acceleration due to gravity and is symbolized by the letter g. What is the value of g on Earth's surface?

2

If a freely falling object were somehow equipped with a speedometer, its speed reading would increase each second by

2

Acceleration is defined as

the rate at which distance is covered

the rate at which an object freely falls from rest

the distance an object has fallen

the rate at which velocity itself changes

5

A jet on an aircraft carrier can be launched from 0.00 to 50.00 m/s in 2.00 seconds. What is the acceleration of the jet?

5

A peachfalls from a tree and 20 seconds later hits the ground. How fast is the peach falling when it hits the ground?

5

A crate falls from an airplane flying horizontally at an altitude of 1810m. Neglecting air drag, how long will the crate take to strike the ground?

5

If a projectile fired beneath the water, straight up, breaks through the surface at a speed of 14.0 m/s, to what height above the water will it ascend?

5

A caterpillar crawling up a leaf slows from 0.75 cm/s to 0.50 cm/s at a rate of -0.05 cm/s². How long does it take the caterpillar to make the change?

5

Perhaps sometime in the future, NASA will develop a program to land a human being on Mars. If you were the first Mars explorer and discovered that when you dropped a hammer it took 0.68 s to fall 0.90 m to the ground, what would you calculate for the gravitational acceleration on Mars?

5

EXTRA CREDIT: In 1945, the Enola Gay, a B-29 bomber, dropped the atomic bomb from a height of 9450. m over Hiroshima, Japan. If the plane carrying the bomb were traveling with a horizontal velocity of 67.0 m/s, how far horizontally would the bomb have traveled between the point of release and the point where it exploded 513 m above the ground? (To avoid being above the bomb when it exploded, the Enola Gay turned sharply away after the bomb’s release.)

5

The Kentucky Derby, the first leg of horse racing’s Triple Crown, was won on May 5, 2007 by Street Sense with a time of 120.17s. If the race covers 2011.25m, what was Street Sense’s average speed in m/s?

2

For the following graph, find the following: velocity

2

For the following graph, find the following: distance travelled

2

For the following graph, find the following: time

2

For the following graph, find the following: initial velocity

2

For the following graph, find the following: final velocity

2

For the following graph, find the following: distance travelled

2

For the following graph, find the following: maximum velocity

2

For the following graph, find the following: minimum velocity

2