lobizombie.blogg.se - Downfall gravity lab machine with paper tape

Also mention the difficultly students would have making these measurements since the car falls so rapidly. Through the discussion, help the students realize that they would need to measure the distance fallen during several equal time increments to determine this answer. Drop the car again and ask the students what they would measure to decide if the car was dropping at a constant velocity or if the car was increasing in velocity as it falls.Students should realize that gravity is causing the car to fall. Ask students what forces act on the car as it falls. Hold a toy car in the air and drop it.Extra tape can be used to secure the dropper assembly if necessary. The dropper stem should now extend slightly behind the car and the dropper should remain upright. Place the underside of the plastic disk on the tape ring. Place a tape ring near the back edge of the car.The dropper should be perpendicular to the plastic disk and remain upright. Insert the stem of the dropper into the small hole.The hole needs to be just large enough for you to insert the stem of your dropper. Poke a hole in the edge of the disk with a pencil compass or small nail. Cut off the sides of a small plastic cup.If a steady flow of water leaves the pipette, you may need to pull and stretch the plastic out again because your opening is too large. If individual drops leave the end of the stem, you have successfully made a water dropper. Cut off the rounded top of the bulb of the pipette.

Cut off some of the narrowed length so that a narrow tip of about 1 cm remains.

You will be left with a long thin tube at the end of the pipette stem. (This is called necking.) Keep pulling until the end with the pliers breaks off. (Do not hold the bulb of the pipette or you may pull the stem completely off the pipette.) Pull firmly on the plastic until it begins to deform and stretch. Use your other hand to grasp the upper part of the stem.

Using a pair of pliers, grasp the remaining attached stem near the end.

Cut off the stem of a plastic pipette so that the remaining stem is only 5 cm long.

Small cup of water with food coloring added.

Small toy car with dropper attached (prepared in advance).

Narrow adding machine tape (1 5/8 inch).2 - 4 meter sticks depending on the length of the ramp.Narrow track made from one of the following: Small toy car such as Matchbox or Hot Wheels - one per group (a toy truck with a flat bed or a van works best for attaching the dropper).Plastic pipette, thin stem - one per group.Students will be able to describe the motion of their car based upon information in their graphs.Students will construct graphs from their data.Students will collect and record distance and time data for a moving toy car.What should the students be able to do as a result of this lesson? Students will be able to define acceleration as a rate of change in speed or velocity.

Students will identify gravity as the accelerating force on their car.

Students will be able to interpret a curved line on their distance and time graphs as a change in velocity.

Students will explain/discuss that unbalanced forces cause a change in motion.

What should students know as a result of this lesson? From the drops, students will be able to collect data and graph both the velocity and acceleration of the car. The changing distances between the successive drops indicate that the car was not traveling at a constant speed. Students observe the pattern of drops left by the moving car.

Students investigate the motion of a car traveling on an inclined plane and along a flat surface. I am re-writing it here because it will be taken off the web in the near future.) Abstract Source: Downhill Racer taken from OSCI 7-10 Physical Science materials developed in 2005 (I am the original author of this activity. Printer Friendly Version Forces and Motion - The Downhill Racer