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17

012-05460A

Ballistic Cart Accessory

Experiment 7: Inclined Plane - Demonstration

EQUIPMENT NEEDED

– Ballistic Cart Accessory (ME-9486)
– Dynamics Cart and track
– Drop Rod Accessory (ME-9487)
– Table clamp and rod
– Rod clamp for dynamics track

Purpose

This demonstration shows that a ball dropped from the drop rod on a cart that is accelerating
down an inclined plane will be caught by the cart regardless of the angle of incline.

Procedure

➀

Prior to the beginning of the demonstration, perform the Setup procedure.

➁

Position the drop rod so that when the track is level, the ball will be directly over the cup.

Drop Rod

Accessory

modified

pink ball

trip bracket

end stop

table clamp

rod clamp

table

Figure 7.1: Inclined Plane

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Содержание ME-9486

Страница 1: ...cientific 5 00 Phone 916 786 3800 FAX 916 786 8905 TWX 910 383 2040 10101 Foothills Blvd P O Box 619011 Roseville CA 95678 9011 USA better teach physics ways to BALLISTIC CART ACCESSORY CAUTION DO NOT LOOK DOWN BARREL ON WHEN FLASHING BALLISTIC CART ACCESSORY BALL LAUNCHER PHOTOGATE DROPROD JACK POWER OFF ON ...

Страница 2: ......

Страница 3: ... Demonstration 5 Experiment 2 Tunnel Demonstration 7 Experiment 3 Accelerating Cart Demonstration 9 Experiment 4 Inclined Plane Demonstration 11 Experiment 5 Drop Ball Demonstration 13 Experiment 6 Accelerating Cart Demonstration 15 Experiment 7 Inclined Plane Demonstration 17 Experiment 8 Bombing Run Demonstration 19 Experiment 9 Bombing Run Computerized 21 Experiment 10 Bombing Run Non Computeri...

Страница 4: ...rmission is granted to non profit educational institutions for reproduction of any part of this manual providing the reproductions are used only for their laboratories and are not sold for profit Reproduction under any other circumstances without the written consent of PASCO scientific is prohibited Limited Warranty PASCO scientific warrants this product to be free from defects in materials and wo...

Страница 5: ... in other models which used a string to release the ball The barrel can be aimed to ensure that the ball is shot vertically Special no bounce foam prevents the ball from bouncing back out of the catcher cup The PASCO ME 9487 Drop Rod Accessory can be mounted to the Ballistic Cart Accessory so a special plas tic ball can be dropped from rest relative to the cart above the moving cart Also the drop ...

Страница 6: ...tic Cart Accessory thumbscrews 2 ME 9486 Ballistic Cart accessory Equipment The ME 9486 Ballistic Cart Accessory includes the following one Ballistic Cart Accessory one Trip Bracket assembly one 9 volt battery two yellow nylon balls two thumbscrews Drop Rod Accessory modified pink nylon balls 2 The ME 9487 Drop Rod Accessory includes the following oneDrop Rod Accessory two modified pink nylon ball...

Страница 7: ...llation AIM ADJUST DROP ROD CLAMP DROP ROD JACK AIM ADJUST Slide the photogate trip bracket into the T slot on the dynamics track See Figure 3 Figure 2 Ballistic Cart Installation Dynamics Cart thumbscrews 2 power switch aim adjust screws Ballistic Cart Accessory thumbscrew storage Drop Rod jack INSTRUCTIONS 1 MOUNT UNIT ON CART 2 TURN UNIT ON 3 INSERT AND DEPRESS BALL 4 INTERRUPT PHOTOGATE TO LAU...

Страница 8: ...ip switch must be mounted on the same side as the photogate on the Ballistic Cart See Figure 3 ME 9487 Drop Rod Accessory Drop Rod Installation Use the 11 2 inch metal screws to fasten the drop rod clamp to the side of the Ballistic Cart Accessory See Figure 4 Screw the thumb screw into the end of the drop rod clamp Thread the cord from the drop rod through the drop rod clamp and clamp the end of ...

Страница 9: ...k leaving enough room to push the cart up to its maximum speed before it reaches the trip bracket See Figure 1 1 Load the ball and start the cart from that end of the track by giving the cart a gentle push The cart will move slowly and the ball will be caught Return the cart to the end of the track Load the ball and give the cart a stronger push CAUTION You must catch the cart with your hand befor...

Страница 10: ...6 Ballistic Cart Accessory 012 05460A Notes ...

Страница 11: ...ese two opposing ends of the box See Figure 2 1 Set the box upside down over the middle of the dynamics track Check the clearance by running the cart through the tunnel Position the photogate trip bracket in front of the tunnel so the ball will be launched just before the cart enters the tunnel Load the ball and push the cart toward the tunnel You may have to practice to get the right speed so the...

Страница 12: ...8 Ballistic Cart Accessory 012 05460A Notes ...

Страница 13: ...the Setup procedure Clamp the pulley to the end of the track Attach a string about 1 meter long to the cart and pass it over the pulley Hang about 50 grams on the string See Figure 3 1 Put the photogate trip bracket in a position where it will launch the ball after the cart has begun to move Start the cart as far back as possible load the ball and let it go In this case the ball will fall behind t...

Страница 14: ...10 Ballistic Cart Accessory 012 05460A Notes ...

Страница 15: ...1 Be careful not to choose too high an angle because the cart will reach such a high speed that it will crash at the bottom For any angle you choose be sure you catch the cart at the bottom to keep it from derailing and crashing to the floor Put the photogate trip bracket in a position where it will launch the ball after the cart has begun to move Start the cart at the top of the incline load the ...

Страница 16: ...12 Ballistic Cart Accessory 012 05460A Notes ...

Страница 17: ...n the drop rod and trip the release mechanism with a penny or other opaque object This shows the students that the ball is drops straight down and is caught by the cart Put the photogate trip bracket near one end of the track leaving enough room to push the cart up to its maximum speed before it reaches the trip bracket Hang the ball from the drop rod and give the cart a gentle push Return the car...

Страница 18: ...14 Ballistic Cart Accessory 012 05460A Notes ...

Страница 19: ...all will be directly over the cup Clamp the pulley to the end of the track Attach a string about 1 meter long to the cart and pass it over the pulley Hang about 50 grams on the string See Figure 6 1 Put the photogate trip bracket in a position where it will drop the ball after the cart has begun to move Start the cart as far back as possible hang the ball on the drop rod and release the cart In th...

Страница 20: ...16 Ballistic Cart Accessory 012 05460A Notes ...

Страница 21: ...ation shows that a ball dropped from the drop rod on a cart that is accelerating down an inclined plane will be caught by the cart regardless of the angle of incline Procedure Prior to the beginning of the demonstration perform the Setup procedure Position the drop rod so that when the track is level the ball will be directly over the cup Drop Rod Accessory modified pink ball trip bracket end stop...

Страница 22: ...or any angle you choose be sure you catch the cart at the bottom to keep it from derailing and crashing to the floor Put the photogate trip bracket in a position where it will drop the ball after the cart has begun to move Start the cart at the top of the incline hang the ball on the drop rod and release the cart The ball will land in the cart CAUTION Remember to catch the cart Repeat the demonstr...

Страница 23: ...Drop Rod Accessory ME 9487 Paper cup for catching ball Purpose This demonstration shows the students that a bomber must release the bomb before the plane is over the target Procedure Prior to the beginning of the demonstration perform the Setup procedure Figure 8 1 Bombing Run floor cup trip bracket Drop Rod Accessory end stop table modified pink ball ...

Страница 24: ... the middle of the track Place the cart on the track at the position of the trip bracket and place the cup on the floor under the drop rod Pull the cart back to one end of the track hang the ball on the drop rod and push the cart The ball will be dropped at the moment the cart passes over the cup See Figure 8 1 Discuss with the students the reason the ball misses the cup Move the trip bracket back...

Страница 25: ...d Meter stick Clamp on pulley Purpose In this experiment the distance from the target that a bomber must release the bomb is calculated and verified Procedure Prior to the beginning of the experiment perform the Setup procedure Align the track with the edge of the table Position the drop rod so that as the ball drops it will miss the table and fall to the floor Position the photogate trip bracket ...

Страница 26: ...om rest each time Move the cart toward the pulley until the mass just touches the floor Then place the trip bracket at the cart s position This will cause the cart to drop the ball after the cart has reached its constant speed Note that the stiff string will continue to move forward and not bunch up under the cart This is the reason for not using thread Without hanging the ball on the drop rod pul...

Страница 27: ...1 2 gt2 Using your measured value for y calculate the time it takes for the ball to fall t 2y g 11 Calculate the horizontal distance x that the ball travels x vt This is the position where the ball should land 12 Use a plumb bob and meter stick to measure off the distance x Place a paper cup at this position on the floor 13 Hang the ball from the drop rod pull the cart back against the end stop an...

Страница 28: ...24 Ballistic Cart Accessory 012 05460A Notes ...

Страница 29: ... for a known distance to obtain a repeatable velocity at the time of release Theory We can measure the distance that the cart will accelerate before dropping the ball d in Figure 10 1 and the height y that the ball will fall Knowing the mass of the cart and the hanging mass we can predict where the ball will land First the velocity of the cart after travelling a distance d from rest will be vo 2ad...

Страница 30: ...all attachments including the ball Substituting this value for acceleration into the equation for x gives us our desired equation x 2 mdy m M Procedure Weigh the cart and its attachments Record this mass as M Weigh the hanging mass and record it as m Set up the equipment as shown in Figure 10 1 You may want to tape a large sheet of paper to the floor on which to mark positions d x cup mass initial...

Страница 31: ... distance between these positions and record as d Calculate x Measure this distance from the point at which the ball drops and mark this location Place the paper cup on this mark Hold the cart against the end stop Make sure that the ball is loaded correctly and the Ballistic Cart Accessory is turned on Release the cart and see if the ball lands in the cup Questions Did the ball land in the cup If ...

Страница 32: ... which ensures that the ball and cart remain aligned Now let s consider the case where the cart is accelerating Velocity Acceleration Acceleration In this case the ball s acceleration is still only in the vertical plane but the cart has a horizontal acceleration This horizontal acceleration changes the velocity of the cart but not the velocity of the ball The cart does not remain directly beneath ...

Страница 33: ...l PASCO right away you won t lose valuable data If possible have the apparatus within reach when calling This makes descriptions of individual parts much easier If your problem relates to the instruction manual note Part number and Revision listed by month and year on the front cover Have the manual at hand to discuss your questions Feed Back If you have any comments about this product or this man...

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