physics

Question 1

What is centripetal force?

Answer 1

The inward force (toward the center of the circle) that causes an object to change direction.

Question 2

What direction does centripetal force always point?

Answer 2

Inward, toward the center

Question 3

Velocity is a vector quantity, meaning it has _______ and ________

Answer 3

magnitude__ and __direction

Question 4

In circular motion, the __magnitude__ is now constant, while ________ changes

Answer 4

direction

Question 5

As clothes spin in a washing machine, they experience a force ________

Answer 5

inward

Question 6

If the washing machine had a vertical drum, the clothes would feel the heaviest

Answer 6

at the bottom

Question 7

As radius increases, centripetal acceleration ______ and centripetal force _______

Answer 7

both decrease

Question 8

As speed increases, centripetal acceleration ______ and centripetal force _______

Answer 8

both increase

Question 9

Centripetal force is directly proportional to the square of the speed, __ directly __ proportional to the mass, and ______ porportional to the radius/distance

Answer 9

inversely

Question 10

Lifeguard whistle being swung in a circle.

Answer 10

tension in the lanyard

Question 11

Moon orbiting around the Earth.

Answer 11

gravity

Question 12

Car going around a curve.

Answer 12

friction between tires and road __

Question 13

Mrs Tolmich waving her scarf in a circle at the ATL UTD game.

Answer 13

tension in arms and scarf__

Question 14

Loop on a roller coaster.

Answer 14

normal force between track and train __

Question 15

If the distance increases by a factor of 10, how will the centripetal force change?

Answer 15

decreases by 1/10

Question 16

If the speed increases by a factor of 10, how will the centripetal force change?

Answer 16

increases by 100

Question 17

If the speed and the distance increase by a factor of 10, how will the centripetal force change?

Answer 17

increases by 10

Question 18

What is the centripetal acceleration exerted on an object moving 5 m/s around a circle of radius 1.0m?

Answer 18

25 m/s2

Question 19

A 0.24kg whistle is on a 0.45m lanyard. If it is spinning over a lifeguard’s head at 3.7m/s, what is the centripetal force holding the whistle in the circle?

Answer 19

7.3 N

Question 20

An object is swung in a circle of radius 0.7 m. If it spins at a rate of 7m/s, what is the centripetal acceleration experienced by the object?

Answer 20

70

Question 21

What is the force experienced by a 1000 kg car going 22 m/s around Spaghetti Junction (bridge turn radius of 305 m)

Answer 21

1586.9 N

Question 22

What is gravitational force

Answer 22

An attractive force between two masses

Question 23

as distance increase, the gravitional force…

Answer 23

decreases

Question 24

as mass increase, the g force…..

Answer 24

increases

Question 25

Gravitational force is ___directly_____ proportional to the masses and ______inversely______________ proportional to the ______square__________ of the distance.

Answer 25

Gravitational force is ___directly_____ proportional to the masses and ______inversely______________ proportional to the ______square__________ of the distance.

Question 26

If the distance increases by a factor of 10, how will the gravitational force change?

Answer 26

Decreases by 1/100

Question 27

If the mass of one of the objects increases by a factor of 10, how will the gravitational force change

Answer 27

Increases by 10

Question 28

If one mass and the distance increase by a factor of 10, how will the gravitational force change?

Answer 28

Decreases by 1/10

Question 29

If the distance changes by a factor of 1/3, how will the gravitational force change?

Answer 29

Increases by 9

Question 30

If both masses and the distance change by a factor of 1/3, how will the gravitational force change?

Answer 30

Does not change, or “changes by 1”

Question 31

If an object weighs 100 N on earth, what will the new weight be if the earth doubles in mass?

Answer 31

It would be double the original weight, so 200 N

Question 32

If an object weighs 100 N on earth, what will the new weight be if the earth’s radius doubles?

Answer 32

It would be ¼ of the original weight, so 25 N

Question 33

Vector

Answer 33

Vector-quantity with both magnitude and direction

Question 34

Scalar

Answer 34

Scalar-quantity with magnitude but no direction

Question 35

Distance s or v

Answer 35

s

Question 36

displacement s or v

Answer 36

v

Question 37

speed s or v

Answer 37

s

Question 38

velocity s or v

Answer 38

v

Question 39

accerleration s or v

Answer 39

v

Question 40

force s or v

Answer 40

v

Question 41

mass s or v

Answer 41

s

Question 42

weight s or v

Answer 42

v

Question 43

A person drives 100 km in 1.2 hours and 80 km in 0.9 hours. What was the average velocity for the drive?

Answer 43

85.71

Question 44

constant PT

Answer 44

straight

Question 45

accelerating PT

Answer 45

curved

Question 46

constant VT

Answer 46

horizontal line

Question 47

accelerating VT

Answer 47

straight diagonal

Question 48

For a projectile, which velocity remains constant throughout the time of flight?

Answer 48

Vx

Question 49

For a projectile, which velocity includes an acceleration?

Answer 49

Vy

Question 50

Which direction, horizontal or vertical, affects time

Answer 50

vertical

Question 51

Are the vertical and horizontal directions dependent or independent of each other

Answer 51

independent

Question 52

State Newton’s First Law

Answer 52

An object at rest stays at rest and an object in motion stays in motion at a constant velocity (in a straight line) unless acted on by an outside (unbalanced) force.

Question 53

No matter the location, objects always have constant ___mass___, but location (altitude, which planet, space, etc.) changes the object’s ____weight_________.

Answer 53

No matter the location, objects always have constant ___mass___, but location (altitude, which planet, space, etc.) changes the object’s ____weight_________.

Question 54

What formula is associated with Newton’s Second law?

Answer 54

Fnet = ma

Question 55

How are acceleration and force related? _____ porportional

Answer 55

directly

Question 56

How are acceleration and mass related? _____ porportional

Answer 56

inversely

Question 57

What are the two situations for an object to have a net force of zero?

Answer 57

the object is either at rest or moving at a constant velocity.

Question 58

What do you know about the values of the vertical forces?

Answer 58

They are balanced since it is on a surface.

Question 59

If the object has a positive acceleration, what do you know about the horizontal forces?

Answer 59

The force to the right has to be larger than the force to the left

Question 60

State Newton’s Third Law.

Answer 60

For every action there is an equal and opposite reaction.

Question 61

Define work

Answer 61

the amount of energy it takes to move an object.

Question 62

power

Answer 62

the rate at which work is done.

Question 63

All of the energy in a system is determined by

Answer 63

the amount of _____total_____ energy in the beginning.