Enhancing Experimental Investigations

What is the purpose of using the friction sled in the investigation?

• To see how far the sled can travel

• To test the durability of the sled

• To measure the speed of the sled

• To investigate the relative amounts of friction on different surfaces

What did the teacher use to push the sled across different surfaces?

• A toy truck

• A remote control car

• A skateboard

• A bicycle

From what height did the teacher roll the truck down the track each time?

• Different heights each time

• The same height each time

• Half the height each time

• Double the height each time

What additional element did the teacher add to the truck to push the sled with more force?

• A spring

• A fan

• Some mass

• A motor

What surfaces did the teacher use in the investigation?

• A countertop and some carpet

• A wooden floor and a tile floor

• A metal surface and a plastic surface

• A glass surface and a rubber surface

What should be changed in an experimental investigation?

• One thing

• Two things

• Nothing

• Everything

What mistake did the teacher make in the investigation?

• Used different trucks

• Used different surfaces

• Used different sleds

• Used different amounts of mass on the truck

How can the investigation be improved?

• By changing the height of the track

• By keeping the mass on the truck the same in each trial

• By using different sleds

• By using different trucks

What was the result when the investigation was improved?

• The sled did not move at all

• The sled moved farther on the rough carpet

• The sled moved the same distance on all surfaces

• The sled moved much farther on the smooth countertop

What should be kept the same in an experimental investigation?

• Everything except the one thing being changed

• Only the mass

• Only the surface

• Everything