Motion Unit Lesson 6

MOTION UNIT LESSON 6Monday, December 12, 2011

Today’s Warm-up

1) Tape the following into your journal2) Complete “Moving Along II”

Classify the following as constant velocity or acceleration

1. An ant carries a grape along covering two centimeters every second.

2. The subway train glides to a stop at the metro station.

3. Peter is riding his bike down the road . He makes a right turn into the movie theatre.

4. An apple is sitting on the table.

5. A squirrel is climbing a tree at a speed of 1 m/s. She spies a bunch of acorns hidden in a tree and she sprints at a rate 2.5 m’s to get them.

Moving Along II

Science StandardS8P3. Students will investigate relationship between force, mass, and the motion of objects.

a. Determine the relationship between velocity and acceleration.

Today’s Essential Question

How is the motion on a distance-time graph

correlate with the same motion shown a speed-time

graph?

Daily Goals1. Demonstrate knowledge of velocity and

distance-time graphs.2. Interpret a speed vs. time graph to determine

if object demonstrates constant speed, positive acceleration, or negative acceleration.

3. Compare the speed of a ball rolling down a ramp to the speed of the tumble buggy car.

Let’s compare the motion of a tumble buggy to the motion of a ball rolling down a hill.

This will be a whole class experiment. Each team must complete their measurement twice. Average the time and report it to teams #7 and 8

Team #1 – Measures the time it takes for a tumble buggy to go from 0 to 1 meter mark.

Team #2 -- Measures the time it takes for a tumble buggy to go from 1 to 2 meter mark.

Team #3 -- Measures the time it takes for a tumble buggy to go from 2 to 3 meter mark.

Toy Race Lab

Let’s compare the motion of a tumble buggy to the motion of a ball rolling down a hill.

This will be a whole class experiment. Each team must complete their measurement twice. Average the time and report it to teams #7 and 8

Team #4 – Measures the time it takes for a ball rolling down a ramp to go from 0 to 1 meter mark.

Team #5 -- Measures the time it takes for a ball rolling down a ramp to go from 1 to 2 meter mark.

Team #6 -- Measures the time it takes for a ball rolling down a ramp to go from 2 to 3 meter mark.

Toy Race Lab

Let’s compare the motion of a tumble buggy to the motion of a ball rolling down a hill.

This will be a whole class experiment. Each team must complete their measurement twice. Average the time and report it to teams #7 and 8

Team #7 – Compute the speed of the tumble buggy on each leg. Graph the results

Team #8 -- Compute the speed of the tumble buggy on each leg. Graph the results

Toy Race Lab

Toy Race Lab Data

d T. Bug

Ball

123

Time (seconds)

Dis

tanc

e (m

eter

s)

Observations:

Conclusion:

On a distance-time graph, there are two types of graphs.

1.A straight line – represents constant velocity2.A curved line – represents changing velocity

OR accelerationa.Curves upward (getting steeper) – object is

speeding upb.Curves downward (getting flatter) -- object is

slowing down

Constant speed is shown by straight lines on a distance time graph.

A curved line – represents changing velocity OR acceleration

a) Curves upward (getting steeper) – object is speeding up

b) Curves downward (getting flatter) -- object is slowing down

1.A straight horizontal line on a speed-time graph means that speed is constant. A straight line does not mean that the object is not moving!

2.A straight line sloping upward means the velocity is increasing… the object is traveling faster and faster.

3.A straight line sloping downward means the velocity is decreasing … the object is traveling slower and slower.

On a speed-time graph, you will only see straight lines.