Speed, Velocity, Acceleration

What is average speed?

The speed over the entire trip.

What is velocity?

Speed in a given direction.

What is acceleration?

The rate of change of speed.

mass stays the same and weight changes

What happens to mass and weight if an astronaut goes into space?

40-55/5=-3 m/s/s forward

What is the acceleration of a car going 55 m/s and then slows to 40 m/s in 5 sec?

10-0/5= 2 m/s/s forward

What is acceleration of a 500 Newton person going from 0 to 10 m/s in five seconds?

velocity

Which motion problems must have a direction?

Define Force

A push or a pull

A vector is a quantity represented by an arrow showing both __________ and _____________

Magnitude and Direction

A person walks the length of the football field (120 yards) and back. What was the total distance traveled?

240 yards

Velocity is defined with both _________ and _________

speed and direction

What is the speed formula?

Distance/Time

What is the average velocity of a commercial jet that travels from New York to Los Angeles (a distance of 4,800 km) in 6 hours?

8oo km/hr west

A trip to Atlanta Georgia took 10 hours in a car. The distance was 1,100 km. Calculate the average speed traveled throughout the trip.

110 km/hr

How long will a trip take (in hours) if you travel 350 km at an average speed of 70 km/hr?

5 hours

What is the importance of 9.8 meters per second squared ?

It is acceleration due to gravity on Earth.

This is the term for the rate at which velocity changes over time.

Acceleration

What is Newton's Third Law of Motion?

For every action force there is an equal and opposite reaction force.

What unit do scientists use when measuring force?

The Newton

The force that resists motion

Friction

A measure of an object's tendency to remain at rest or continue at constant speed

Inertia

This is the term for the force with which gravity pulls on a quantity of matter

weight

Draw a distance vs. time graph for a person who jogged away from his house at a constant rate, rested for a longer time than he jogged, then turned around and returned home jogging at a constant rate.

Red line

A driver is traveling east on a dirt road when she spots a pothole ahead. She slows her car from 14.0 m/s to 5.5 m/s in 6.0 s. What is the car's acceleration?

-1.4 m/s squared east

object in motion

distance between object and reference point changes

constant speed - getting farther away - Graph Distance/Time

What is this graph showing?

constant speed - Speed/Time Graph

What is this graph showing?

graph showing object is stopped

graph showing acceleration

What is this graph showing?

graph showing constant acceleration

15 miles

Mary can travel at 20 mi/hr on her bike. How far will she go if she rides for 0.75 hr?

100 km/hr

A motorcyclist travels 500 km in 5 hours. What is his average speed?

4 seconds

A snail can crawl at a speed of 0.75 cm/s. How long will it take the snail to crawl 3 cm?

acceleration

change in velocity over time

constant speed

speed that stays the same over time

reference point

used to determine if an object is moving

speed

distance divided by time

velocity

speed and direction

2 m/s/s

What is the acceleration of a car that goes from 4 m/s to 10 m/s in 3 seconds?

time

distance divided by speed

distance

speed multiplied by time

acceleration

average speed

total distance divided by total time

negative acceleration (deceleration) graph

negative acceleration (slowing down)

positive acceleration

speeding up

3 ways to accelerate

speed up, slow down, change direction

acceleration formula

a=vf-vi/t

speed formula

s=d/t

distance formula

d= s x t

time formula

t=d/s

velocity formula

v=d/t, direction

velocity

speed & direction

Vector

A quantity that has both magnitude and direction.

Constant speed, away from the original starting place.

Number #1

At rest, no motion

Number #2

Slower speed, traveling back in the direction came from

Number #3

Faster speed (look at the slope of the line)

Number #4

At rest, no motion

Number #5

The fastest speed shown on this graph, back to the starting place

Number #6

5 m/s/s

A car increases in speed from 5 m/s to 20 m/s in 3 seconds. What is the acceleration?

4 m/s/s

A car increases in speed from 2 m/s to 22 m/s in 5 seconds. What is the acceleration?

3 m/s/s

A car starts from rest and attains a speed of 12 m/s is 4 seconds. What is the acceleration?

2 m/s/s

A car starts from rest and attains a speed of 4 m/s is 2 seconds. What is the acceleration?

0 m/s/s

A car moving at 2 m/s maintains its speed of 2 m/s for 2 seconds. What is the acceleration?

25 m/s

A car starting from rest accelerates at 5 m/s/s for 5 seconds. What is its final speed?

24 m/s

A car starting from rest accelerates at 3 m/s/s for 8 seconds. What is its final speed?

11 m/s

A car moving at 5 m/s accelerates at 2 m/s/s for 3 seconds. What is its final speed?

10 m/s

A car moving at 2 m/s accelerates at 4 m/s/s for 2 seconds. What is its final speed?

4 s.

A car starting from rest accelerates at a rate of 5 m/s/s to a final speed of 20 m/s. How much time does this take?

8 s.

A car starting from rest accelerates at a rate of 8 m/s/s to a final speed of 64 m/s. How much time does this take?

3 s.

A car moving at 6 m/s accelerates at a rate of 2 m/s/s to a final speed of 12 m/s. How much time does this take?

6 s.

A car moving at 10 m/s accelerates at a rate of 5 m/s/s to a final speed of 40 m/s. How much time does this take?

A snail travels the distance of 25 meters in two days. What is its speed in meters per hour?

0.52 m/hr

A lizard climbs up a tree approximately 8 meters in 10 seconds. What is it's speed?

0.8 m/s

An average bullet travels approximately 90m in 0.5 seconds. What is it's speed?

180 m/s

How much time will it take a cheetah to run 200 m at a speed of 20 m/s?

10 s

A woman can walk in high heels for a distance of 1 kilometer in 15 minutes. What is her hourly speed?

4 km/hr

A gibbon can travel through the canopy up to a distance of 28 kilometers in a half hour. What is it's speed?

56 km/hr

Orville Wright's first powered airplane flight lasted only 12 seconds. He was in the air for a distance of 37 meters. What was his whopping speed??

3.08 m/s

Chris flies a plane 870 km in 1.5 hrs. What is his average speed?

580 km/hr

The Lockheed SR-71 Blackbird travels 882.5 kilometers in 15 minutes. What is its speed in km/hr?

3,530 km/hr

It takes Will 15 s to ride his bike 500 m. What is his average speed?

33.33 m/s

Sam runs 100 m in 12 s. What is his average speed?

8.33 m/s

Luke rides his bike 800 m in 58 s. What is his average speed?

13.79 m/s

Tom walks 100 m in 23 s. What is his average speed?

4.35 m/s

s=d/t solve for s

A girl takes 30 mins to travel around a cross- country ski course: a distance of 10 km. Calculate her average speed in m/s

5.56 m/s

s=d/t solve for d

Traveling at a speed of 100 km/hr, how far will a bus travel in half an hour?

50 km

A boy sets off for a walk around his village at an average speed of 3.6 km/hr. How far will he travel in 30 mins?

1.8 km

How far does a bowling ball travel at a speed of 9.8 m/s if it rolls for 5 s?

49 m

s=d/t solve for time

Tina's calculations of a tarantula found that the spider was able to cover 20 cm at a speed of 4 cm/s. How long did it take the spider to travel this distance?

5 s