Physics 101 Test 1

A student releases a ball from rest on an inclined plane and measures that it travels a distance of 10.0 m in a time of 4.0 s. The average speed of the ball is

2.5 m/s

A car is moving on a highway with a speed of 60 m/s. 5 seconds later the car is moving at 10 m/s in the same direction. The magnitude of the car's acceleration is

-10 because it slowed down

A ball is thrown downward on an inclined surface from the top with a speed of 30 m/s. The ball experience an acceleration of 5 m/s2. After 2 s, its velocity will be (down on the incline is considered a negative direction):

-40 m/s

If you throw a baseball straight up, what is its velocity at the highest point it reaches

0 m/s

A freely falling object (neglecting air resistance) has its velocity

Changing linearly with Time

What is the terminal velocity?

The highest speed an object reaches because air resistance offsets gravity in the real world

Instantaneous speed is calculated by choosing a short time interval during which the speed is held constant or as nearly constant as is practicable.

True

An object undergoing free fall experiences

a constant acceleration

scientific law

a generalization based upon experiments or observation

A car goes from 0 m/s to 10 m/s in 1 second, moving along the negative x-axis. What is its acceleration?

-10 m/s^2

A centimeter is

1/100 a meter

One-inch equals

2.5 cm

A ball is thrown up in the air with an initial velocity of 40 m/s. What is the ball's velocity after 2 seconds?

20 m/s traveling upward`

A great white shark can swim with a speed of about 16 meters per second. Convert the shark's speed to miles per hour. (1 mile = 1609 meters, and 1 hour = 3600 seconds)

36 miles per hour

Acceleration is scalar or vector

Scalar

Which would hit the ground first if dropped from the same height in a vacuum—a feather or a metal bolt?

They would hit the ground at the same time.

If the acceleration is zero, the velocity is constant.

True

Slope of Velocity vs. Time

acceleration

The value for the acceleration due to gravity is ms-2

downward 9.8

During every second after an object dropped from rest. The object is in free fall and its speed,

increases by 9.8 m/s

An essential feature of a scientific theory is

the making of predictions that can be tested

Which graph shows an object moving with a constant non-zero velocity?

velocity stays the same time continues to go

What is the difference between distance and displacement?

Displacement is a vector quantity and distance is a scalar

Which of these is not important to the development of scientific explanations?

Measurement, communication, debate,

The term for the application of the basic laws of nature to produce practical devices for mankind is

Technology

aceleration formula

Velocity final - velocity initial / time

Acceleration represents the

change in velocity with respect to time

When speed and direction remain the same throughout a motion, this is called?

constant velocity

Average speed is calculated by

dividing the distance traveled by the elapsed time

During the first second after an object is dropped from rest and experiences free fall its displacement

increases by 4.9 m

After it passes the peak of the path of its motion an object thrown upward has

its velocity directed downward and its acceleration directed downward

Just after it is released, an object thrown upward has

its velocity directed upward and its acceleration directed downward

Just before it reaches the peak of the path of its motion an object thrown upward has

its velocity directed upward and its acceleration directed downward

A unit of volume in the metric system is the

liter

The basic unit of length in the metric system is the

meter

The most widely used system of measurement in the world is the

metric system

When the velocity of an object does not change, what happens to its acceleration?

nothing, it does not accelerate

A negative distance implies that an object is

on the negative side of the origin

Distance is scalar or vector?

scalar

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

In the case of uniform accelerated motion, the graph of velocity versus time is a straight line.

true

slope of a position vs time graph

v=x/t velocity

A car starts from rest and reaches 20 m/s in 5 seconds. The average acceleration of the car is

4m/s^2

A freely falling object starts from rest. After falling for 6 seconds, it will have a speed of about

60 m/s

A ball is thrown upward in the air with an initial velocity of 40 m/s. How long does it take to reach back to the point it was thrown from? (consider gravitational acceleration is 10 m/s2)

8 s

An object accelerates at 2 m/s2. Assuming the object starts from rest, how much time does it need to accelerate to a speed of 16 m/s?

8 s

When an object falls in the physics world (no air resistance) from high in the sky, what happens?

It accelerates at a constant rate until it hits the ground

In one dimensional motion, the average speed of an object that moves from one place to another and then back to the original place has which of the following properties?

It can be positive negative or zero

Velocity is a scalar or vector?

vector