77 Mass and Collision

LIMITED LICENSE TO MODIFY. These PowerPoint® slides may be modified only by teachers currently teaching the SEPUP course to customize the unit to match their students’ learning levels or to insert additional teaching aides. Modified slides may be used only by the modifying teacher in his or her classroom, or shared with other teachers of SEPUP within the teacher’s school district, with these same restrictions. Modified slides may not be taken out of the classroom or distributed to any non-student person or organization. Except for use with students in the classroom, modified slides may not be published in printed or electronic form, including posting on the Internet. Only text may be modified: photographs and illustrations on the slides may not be modified in any way except to change their size.

DISCLAIMER OF WARRANTY. THE REGENTS OF THE UNIVERSITY OF CALIFORNIA (“University”) MAKE NO REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. University will not be liable for any costs, damages, fees or other liability, nor for any direct, indirect, special, incidental or consequential damages (including lost profits) with respect to any claims by the purchaser or user of SEPUP or any third party on account of or arising from the use or modifications to the slides. Client acknowledges and accepts that University services are provided on an as-is basis. Copyright © 2015 The Regents of the University of California. All rights reserved.

Header photo: Sam Howzit | Flickr Creative Commons

Slide Design: Shaun Wegscheid | Fonts: Arial, Kalinga

Title slide photo: Jean Scheijen | FreeImages.com

77 Mass and Collision

Key Vocabulary

• acceleration• controlled variable• deceleration• force• mass• tested variable• variable• weight

77 Mass and Collision

Read the introduction and look for key ideas

What are the properties of this hammer that giveit the potential to apply a lot of force?

77 Mass and Collision

Does the mass of an object affect the force it applies during a collision?

Does the mass of the green truck affect the force it applied to the white truck?

77 Mass and Collision

Mass

What is mass?

What is weight?

Record your answer in your notebook.

77 Mass and Collision

Demonstration

Observe the following demonstration of two carts of different mass moving down the ramps simultaneously.

What do you notice about the cart’s speeds?

Record your answer in your notebook.

77 Mass and Collision

Review the procedure

Discuss with your groups, and record in your science notebooks, the variables in the experiment.

77 Mass and Collision

Complete the procedure

Use “Science Skills Student Sheet 5, “Elements of Good Experimental Design,” to help you write your procedure.

77 Mass and Collision

SCORING GUIDE: Designing Investigations

77 Mass and Collision

What was your average distance values for each cart’s mass?

Share your results with the class.

77 Mass and Collision

Analysis question 1

Did the mass of the cart affect the collision? Explain how you know this.

77 Mass and Collision

Analysis question 2

Why do you think mass did or did not have the effect you predicted?

77 Mass and Collision

Analysis question 3

What part(s) of the experimental design:

a. increase your confidence in the data?

b. decrease your confidence in the data?

77 Mass and Collision

Analysis question 4

If your car were in a collision, would you rather be hit by Vehicle 1 (2,027 kg) or Vehicle 2 (1,415 kg) from Activity 73? Explain.

77 Mass and Collision

In this activity, you should have found that the higher the mass the larger the potential force the cart can apply

How does this apply to an accident between a large truck and a passenger vehicle? Explain.

Share your ideas with the class.

77 Mass and Collision

Does the mass of an object affect the force it applies during a collision?

77 Mass and Collision

Key vocabulary definitions

Acceleration - The rate at which an object changes speed and/or direction.

Controlled variable - A variable in an investigation or experiment that is held constant.

Deceleration - The process of slowing down or stopping.

77 Mass and Collision

Key vocabulary definitions

Force - A push or pull.

Mass – The amount of matter in an object or system.

77 Mass and Collision

Key vocabulary definitions

Tested variable - A variable that is changed in a systematic way in an experiment or investigation in order to determine its effect.

Variable - A factor in a scientific experiment that can vary.

77 Mass and Collision

Key vocabulary definitions

Weight - The vertical force exerted by a mass as a result of gravity.