Compare designs that reduce the force in a collision
Grade 11 Science Worksheet
Circle the best answer, or write your answer on the line.
A 2 kg toy cart at 3 m/s must be stopped with an average force of no more than 15 N. How long must the stop last, Ari?
A 4 kg toy cart at 2 m/s must be stopped with an average force of no more than 10 N. How long must the stop last, Bo?
A 0.5 kg toy cart at 6 m/s must be stopped with an average force of no more than 5 N. How long must the stop last, Esme?
In the bar chart, how do the two stops' changes in momentum compare, Jun?
- They are the same, 6 kg·m/s
- The soft stop's is bigger
- Neither changes momentum
- The hard stop's change is bigger
Using the bumper table, with force under 50 N and added mass at most 100 g, why isn't D chosen, Milo?
- Its force is too high
- It adds 150 g, over the limit
- It stops the cart too slowly to count
- It bounces the cart back
Using the bumper table, a classmate picks C because it is lightest. Why does C fail, Noah?
Use the picture in question 5.
- Its 300 N force breaks the force limit
- It is the right pick, being lightest
- It is too heavy
- It bounces the cart back
Using the bumper table, a classmate picks D because its force is lowest. What should Pia point out?
Use the picture in question 5.
- D wins on force, so pick it
- D bounces the cart back
- D's force is too high
- D breaks the 100 g mass limit
Why should every bumper be tested with the same cart at the same speed, Ren?
- So the bumpers wear out evenly
- To raise the force
- So only the bumper changes
- To make the test quicker
Why should each bumper be tested several times, Tala?
- To change the cart's mass between runs
- To make the cart faster
- To check the results are reliable
- To lower the force
A very thin, soft foam bumper squashes completely flat in a test. What problem does that cause, Zee?
- Nothing; flat foam works well
- The cart stops suddenly at the end, with a big force
- The cart bounces back faster
- The force drops to zero