This presentation is the property of its rightful owner.
1 / 15

# Activity 82 Major Concepts PowerPoint PPT Presentation

Activity 82 Major Concepts. Friction is a force that will cause changes in the speed of an object’s motion. The motion of an object can be described by it position, direction of motion, and speed. Activity 83 Analysis. Why does stopping distance depend on road conditions? friction

Activity 82 Major Concepts

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

### Activity 82 Major Concepts

• Friction is a force that will cause changes in the speed of an object’s motion.

• The motion of an object can be described by it position, direction of motion, and speed.

### Activity 83 Analysis

• Why does stopping distance depend on road conditions?

• friction

• surfaces with less friction are more slippery.

• What might cause:

• snow, ice, gravel, and oil

• driver distractions?

• cell phone, music, passengers, eating, and other vehicles

• In which of the three situations (alert and dry, alert and slippery, or distracted, or distracted and dry) does it take:

• the least distance to stop? Explain using evidence.

• the most distance to stop? Explain using evidence.

• This depends on driving speed. At speeds of ____ or less, ______________. At speed greater than ____, the stopping distance for....

• You are alertly driving a car at 40 MPH (18 m/s). You come around a bend and see that a tree has fallen across the road 50 meters away. Will you be able to top before you hit the tree:

• At 40 MPH, it takes __meters for an alert drive to stop car on dry pavement. Under these conditions my car would……

• something were distracting your attention as you came around the bend? Explain.

• If I were distracted, it would take __ meters to stop in dry conditions, and……

• You were driving 20 MPH instead of 40 MPH? Explain

### Activity 83 Major Concepts

• Stopping distance is the sum of reaction time and braking distance

• There are many factors which affect stopping distance (list some)

• The potential for accidents and the existence of hazards impose the need for injury prevention

## Activity 84

Title: Decelerating Safely

Problem: How can a person’s deceleration be controlled during a collision?

Hypothesis: If _____, then __________.

### How do you know when youare accelerating while traveling in a car?

• Starting up froma stoplight.

• Passing a vehicle.

• Acceleration is happening when you have the feeling of being pushed back in the seat while the caraccelerates forward.

### How do you know whenyou are decelerating while traveling in a car?

• When a car comes toa stop, it will make passengers feel like they arethrown forward as the car decelerates.

### Data/Observations:

• Talking Drawing: Safety Features

### Talking Drawing: Safety Features

• Close your eyes and think about what a safe vehicle looks like.Now, open youreyes and draw what you imagined. Label any parts of the vehicle that havespecial features.

• Read the statements on Student Sheet 84.2 before you do the reading

• As you read, check the statements that are correct (supported by the text).

• In the third section, check the statements you agree with. Support each statement (whether you agree or not) with ideas from the reading and your own knowledge. Actually write it down (ignore the instructions on the sheet)