Chapter 2&3 physics

¡Supera tus tareas y exámenes ahora con Quizwiz!

a car maintains a constant velocity of 100km/hr for 10 seconds. during this interval its acceleration is

zero

a car accelerates from rest for 5 seconds until it reaches a speed of 20m/s. what is the cars acceleration

4m/s

at one instant an object in free fall is moving downward at 50m/s. one second later its speed is approximately

60

at one instant an object in free fall is moving downward at 50 meters per second. one second later its speed should be about

60m/s

If a car increases its velocity from zero to 60km/h in 10 seconds, its acceleration is

6km/h/s

If a car accelerates from rest at 2 meters per second, its speed 3 seconds later would be about

6m/s

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

10m's

an object at rest near the surface of a distant planet starts to fall freely. if the acceleration there is twice that of the earth, its speed one second later would be

20m/s

a package falls of a truck that is moving at 30m/s. neglecting air resistance. the horizontal speed of the package just before it hits the ground is

30

a car accelerates from rest from 5 seconds until it reaches a speed of 20m/s. what is the car's acceleration in meters per second

4

the first scientist to be credited for postulating that earth circled the sun was

Copernicus

the first scientist to be credited for postulating the earth circled the sun was

Copernicus

Aristotle and his followers for many centuries thought the earth was at rest at the center of the universe because

humans experience no sensation of a moving earth

when Galileo rolled a ball down one incline so that at the bottom it rolled up another, he found that the ball rolled

almost to its initial height

when the net force on something is zero we say it is

in mechanical equilibrium

a bullet is fired straight down from the top of a high cliff. neglecting air resistance, the acceleration of the bullet in meters per second

is 9.8

a vector quantity

is presented by an arrow, has direction, and has magnitude

Galileo taught us that if you roll a ball along a level surface it will

keep rolling if friction is absent

Galileo said that if you rolled a bag along a level surface it would

keep rolling without slowing if no friction acted upon it

a hockey puck sliding across the ice final come to rest because

of friction

according to Galileo, inertia is a

property of all matter

earliest n the most influential Greek philosopher was aristole who taught that

the four elements are earth,fire, water, and air. all motion is either natural or violent. violent motion requires a sustained push or pull

If an object moves with constant acceleration its velocity must

Change by the same amount each second

if no external forces are acting on a moving object, it will

Continue forever

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

10

an object covers a distance of 8 meters in the first second of travel, another 8 meters during the next second, and 8 meters during the third second. its acceleration in meters per second is approximately

0

when a rock thrown straight up gets the exact top of its path its

0

two measurements necessary for calculating acceleration are

Distance and time

a hockey puck sliding across the ice finally comes to rest because of

Friction

the first scientist to introduce the concept of inertia was

Galileo

the scientist to first introduce the concept of inertia is

Galileo

the property of an object to resist change in motion is known as

Inertia

Every object continues in a state of rest of uniform speed in a straight line unless acted on by a nonzero net force is

Newton's first law of motion

a force is

both a push or pull

if an object moves with constant acceleration, its velocity must

change by the same amount each second

the two measurements necessary for calculating average speed are

distance and time

science greatly advanced when Galileo favored

experiment over philosophical discussions


Conjuntos de estudio relacionados

corrections final questions chapter 1-2

View Set

Math in Focus 7B - Chapter 8 - 8.1: Recognizing Cylinders, Cones, Spheres, and Solids; 8.2: Finding Volume and Surface Area of Cylinders

View Set

study set for microbiology final

View Set

Chapter 6 Configuring Windows Server 2016 Printer

View Set

Final exam review questions (9-10,13)

View Set

Foundations: Health Studies Midterm Review

View Set