Physics - Deck 2

Question 1

What is momentum?

Answer 1

the quantity (amount) of motion an object has

Question 2

What is the formula of momentum?

Answer 2

p=mv (momentum = mass x velocity)

Question 3

What is conservation of momentum?

Answer 3

The law that TOTAL momentum of objects in a system stays the same.

Question 4

What is impulse?

Answer 4

A change in an object’s momentum

Question 5

What’s the formula for impulse?

Answer 5

Fx(change in t)

Force x delta time

Question 6

A change in momentum that takes place over a longer time requires ________ force than if it takes less time.

Answer 6

Less force. Imagine a skydiver. If he opens his parachute too late, he’ll hit the ground too hard.

Question 7

What are the three types of collisions?

Answer 7

Elastic, inelastic, completely inelastic

Question 8

The game of pool/billiards involves a lot of _________ collisions.

Answer 8

Elastic (approximate). Objects remain separate.

Question 9

What is a completely inelastic collision?

Answer 9

When two objects collide and become one mass

Question 10

What is a projectile?

Answer 10

Any object that falls or is thrown/propelled through space by an exerted force

Question 11

What’s the key to calculating the motion of a projectile?

Answer 11

Calculating the horizontal and vertical velocities separately

Question 12

When solving physics problems, what do you always start with?

Answer 12

You start with what you know and solve for the missing pieces.

Question 13

What are the characteristics of waves?

Answer 13

frequency, amplitude, and speed

Question 14

What is frequency?

Answer 14

the amount of wavelengths that occur in a fixed distance

Question 15

What is a wavelength?

Answer 15

the distance between matching parts (crests or troughs) of a wave

Question 16

What is the speed of a wave?

Answer 16

frequency times wavelength

Question 17

What is amplitude?

Answer 17

The distance between the crest of a wave and it’s center (or equilibrium)

Question 18

The two types of waves are ____________ and compressional.

Answer 18

transverse

Question 19

Sound is an example of a __________ wave

Answer 19

compressional

Question 20

Which type of wave has an oscillation that is perpendicular to the direction of the wave?

Answer 20

transverse

Question 21

The louder the sound, the greater the __________

Answer 21

amplitude

Question 22

The Maxwell spectrum is more commonly referred to the _______________ spectrum

Answer 22

electromagnetic spectrum

Question 23

What is the speed of light in a vacuum?

Answer 23

300,000,000 m/s

Question 24

Which has a longer wavelength: red or blue light?

Answer 24

red; they both travel at the speed of light in a vacuum, but red has a longer wavelength

Question 25

Are radio waves and infrared waves sub-visible or ultra-visible?

Answer 25

sub-visible; ultra-visible is above the visible spectrum (x-ray/gamma waves)

Question 26

How does AM radio transmit sound?

Answer 26

Amplitude modulation (AM); translates the information of sound by varying the amplitude of the radio wave

Question 27

What does FM stand for?

Answer 27

frequency modulation

Question 28

What changes the pitch of sound?

Answer 28

The frequency of the sound wave

Question 29

What is static electricity?

Answer 29

when an object has a positive or negative charge

Question 30

What is static discharge?

Answer 30

When a charge "jumps" from one object to another

Question 31

What force commonly generates static electricity?

Answer 31

friction; strips electrons off of atoms

Question 32

What is the main characteristic of a conductor?

Answer 32

It gives up its electrons easily

Question 33

What is the main characteristic of an insulator?

Answer 33

It doesn't give up its electrons easily.