Midterm for Physics chapter 1-3

average speed

the distance traveled divided by the elapsed time

a study of temperature and heat

thermodynamics

second (s)

time

average and instantaneous speed

what are the two types of speed

negative acceleration going up negative acceleration at the top negative acceleration going down

what describes the motion of an object thrown straight up in the air

pound

what is not a metric unit

kilo

what prefix is used for 135000

hence

what unit is used for acceralation

distance

what units does displacement have

velocity has direction speed does not

whats the difference between speed and velocity

Vector

when direction matters the quantity is a

decreases

when directions of velocity and acceleration are opposite the magnitude of the objects velocity

increases in magnitude or speed increases

when directions of velocity and acceleration are the same the objects velocity

velocity

when looking at a displacement versus time, what does the slope represent

direction

where something is heading

1 meter

100cm = how many meters?

2020g

2.02kg=

.484kg

484g=

88 ft/s

60mph is equal to how many ft/s

.61m

61cm=

v=111ft/s d-189ft

A stone is thrown downward with an initial speed of 15 ft/s from the top of Fall Creek Falls toward the pool 256 ft below. Find the speed at 3 s after being thrown and the distance traveled in 3 s.

19.6m

A walnut falls from a limb 24 m from the ground. How far does it fall in 2 seconds? How fast is it going at 2 seconds?

careful observation, formulation of empirical laws, making an hypothesis, experimental testing of hypothesis

Give the steps of the scientific method

straight line

If the acceleration is constant the velocity graph will be a

positive

If we choose to the right to be positive an object moving left and slowing down has an acceleration that is

20 m

In order to find the depth of a well, you drop a stone into it and time its fall. It hits the water after falling for 2 s. The depth of the well is about

Kelvin (K)

Temperature

acceleration

an object falling near Earth shows constanst_____ if friction is insignificant

62

suppose you throw a ball vertically up with a speed of 49m/s. neglecting air friction. what would the height of the ball in 1.5 sec later be

34

suppose you throw a ball vertically up with a speed of 49m/s. neglecting air friction. what would the speed of the ball in 1.5 sec later be

magnitude

tells us how long something is ex. 15m

Gravity

9.80 m/s2 or 32 ft/s2

2 sec

A 10 kg object dropped from a certain window strikes the ground in 2 sec. Neglecting air resistance, a 5 kg object dropped from the same window strikes ground in

4 m/s2

A a car moving to the right at 30m/s increases to 50 m/s in 5.00 seconds. The cars acceleration is

equal to -9.8m/s

A ball dropped in the absence of air resistance accelerates downward at -9.8m/s2. Instead you throw the ball upward the accelerates after its release is

-43 m/s

A ball is thrown straight up from a bridge at a speed of 11m/s. If it takes 5.5 sec to hit water what is the velocity just before it hits the water

8.6m/s down

A ball is thrown straight up from a bridge at the speed of 11m/s what will its velocity (speed and direction) after 2 sec

The accerelation on the ball is always -9.8m/s2

A ball thrown straight up. It reaches its highest point and then falls back.

5.5m/s2

A car accelerates from 0 to 33 m/s in 6 secs. What is the magnitude for the accelerations.

-4.2

A car is traveling at 22m/s and slows to 5.3m/s in 4 sec what is the acceleration

77.5m

A car is traveling at 33m/s when the driver uses the brakes to slow down to 29 m/s in 2.5 sec. How many meters will it travel during that time

28.69

A car moving at 22m/s acceralates at 3 m/s2 for 2.23sec. what will the final speed be in m/s

5.6hr

A car travel at 75km/hrs how long will it take to travel 420km

65.08

A car traveling at 22m/s accerates for 2.45 sec at at a rate of 2.25m/s2. How far will it travel in meters during this time

225km

A car travels at 75 km/hr for 3.00 hrs. How many km will it travel

35m/s and 138m

A car, moving at 20 m/s, accelerates for 5.00 s at a rate of 3.00 m/s2 . What are the new velocity and the distance traveled?

V=5.2m/s V=-24.4m/s

A child throws a golf ball upward from the top of a building. The ball leaves the child's hand at a height of 20 m above the ground traveling upward with a speed of 15 m/s. Find the velocity at 1 s and at 4 s and the height at 1 s and at 4 s.

59

A rock dropped from a bridge takes 3.47 to hit the water. How high is the bridge in meters?

0m/s

A runner can run a 400 meter lap in 50 sec. He finishes at the same spot he began. What is his average velocity?

4.7

A runner travels 1.55km in 5 min and 30 sec. what is the velocity in m/s

40 m

A sprinter accelerates at 5m/s how far will she travel in 4 sec if she starts a 0

4.9m

After 1 sec a ball dropped from rest will have fallen

1.5

Agallon of paint will cover 300ft2. How many gallons will you need to paint a 12ftX18ft wall with two coats of this paint

4,400

An airplane is flying at 95m/s when the engine is turned off. As it glides it experiences a force of drag so that it slows down at -.700m/s2. How far in meters will it travel in 1 min

49m/s

An iron vise falls from rest at a great height. Neglecting air resistance, what acceration has it fallen in the first 5 seconds?

122m

An iron vise falls from rest at a great height. Neglecting air resistance, what distance has it fallen in the first 5 seconds?

A and B will return at the same time.

Ball A is thrown upward with a velocity of 19.6m/s. Two sec later ball B is thrown with a velocity of 9.8m/s which ball will return first

gravity

Each object is pulled down by the

velocity

The slope of a distance time graph is at a particular instant is the

accerelation

The slope of the velocity time graph at a particular instant is the

same time

Two college students are sliding down a hill on sleds (ignore friction).. one has a mass of 85kg other has a mass of 75kg. Which will reach the bottom of hill first

shorter one

Two moutain bikers rolling down a hill. same mass but one is taller and has more air drag. which will reach the bottom first

velocity is 0 and accerelation is downward

You toss a ball straight up in the air. At the highest point, the ball's

Vector

_____ must have both magnitude and direction given

SI unit of measurement

______ is an absolute system in which massis a fundamental quantity and force is defined unit.

10^-2 (c)

centi

displacement

change in position in a specified direction is called

58.7 ft/s

convert 40mph to ft/s

ampere

current

study of circuits, magnetism, fields, amd electromagnetic radiation

electricity and magnetism

resistance (inertia)

heavier objects have a larger _____to being accelerated

instantaneous speed

if the 't' is very small then 's' is

upwards to the right.

if the acceleration is positive the velocity graph will slope

acceleration

is the rate of change in velocity

10^3 (k)

kilo

meter (m)

length

kilogram (kg)

mass

a study of force, motion, and energy

mechanics

10^6 (M)

mega

10^-6 (u)

micro

10^-3 (m)

milli

10^-9 (n)

nano

speed

rate of travel

d/t

s=

number of reliable digits that's measured

significant figures