How Lawn Mower Blades Cut Grass (at 50,000 FRAMES PER SECOND) - Smarter Every Day 196


Comments • 10 728

  • ZetPerson
    ZetPerson  1 years back

    At 6:03 my stepdad walked in and told me to go mow the front yard

  • MJ Young
    MJ Young  4 hours back

    Video shows that its 20% cutting and 80% tore. You need double the speed and VERY sharp blades.......sharpening blades will need be done like every 20minutes!!!

    • TylerSUPERSAIYANsaitama

      No one:

      Literally not a single soul:

      Ants: AAaAAAaAh!!

      • franklin castillo
        franklin castillo  2 days back

        Can you do an episode on how a chainsaw works

        • TrexHunter40
          TrexHunter40  3 days back

          7:44 we can distinctly hear the explosions of the motor, woaw!

        • Corey Sellers
          Corey Sellers  3 days back

          Pleas do a tune up on youre Huskvarna zero turn. It sounds like its starved for air.

          • Goose gaming gang
            Goose gaming gang  4 days back

            The satisfaction

            • Random Hunter
              Random Hunter  1 weeks back

              Why did i click here, as soon as i saw ur face i was like, i cannot be bothered right now, i might have also watched this before

              • Joseph Horrobin
                Joseph Horrobin  2 weeks back

                Any one else not understand

                • F.B.I
                  F.B.I  2 weeks back

                  *Grass has left the chat*

                  • Michael Drapper
                    Michael Drapper  2 weeks back

                    what about brush cutters and strimmers and flymos

                    • MrPbip
                      MrPbip  2 weeks back

                      You need to sharpen your blades terribly dull

                      • Stxllor
                        Stxllor  3 weeks back


                        never be ashamed to learn something new.
                        be ashamed that you were ashamed that you learnt something new.
                        after all, you are SmarterEveryDay.

                        • Chris Henry
                          Chris Henry  3 weeks back

                          Can you do a video on weed eaters or weed whackers as known in some parts of the country

                          • blackbar gaming
                            blackbar gaming  3 weeks back

                            For the lawn tool segment. i would like to know how the energy is transferred from the fly wheel to the ram on a kinetic log splitter.

                            • Sheila olfieWay
                              Sheila olfieWay  4 weeks back

                              take a lawn mower blade or maybe a small version put it into a acrylic box and then run some sort of smoke into the blade to see how the air flows. And don't forget the slow motion camera to really see that airflow

                              • OFF ROAD
                                OFF ROAD  4 weeks back

                                You are becoming my favourite channel.
                                You have some clover in your yard.

                                • matthew wyatt
                                  matthew wyatt  4 weeks back

                                  What about how a weed eater string gets shortened and new string released at the same time. Centrifugal force and stuff.

                                  • Legendary2442
                                    Legendary2442  4 weeks back

                                    Can you do a reel mower in slow motion

                                    • mixter7x7
                                      mixter7x7  4 weeks back

                                      you went out in public with that haircut to demonstrate how a lawnmower works ?

                                      • Maikeru Kurusu
                                        Maikeru Kurusu  1 months back

                                        If lawn mowers use vacuum to lift the grass up, how does a sythe (dunno if I spelled it correctly) works? Is it just force that cuts the grass?

                                        • Robert S
                                          Robert S  1 months back

                                          Wow never thought about it that much lol

                                          • nicolas bourque
                                            nicolas bourque  1 months back

                                            have he ever eard about flo-mo mowers ?

                                            • HotdogAnd aHayride
                                              HotdogAnd aHayride  1 months back

                                              Actually the tabs and the air flow they create are for waste management and have nothing to do with how the grass is cut. Speed is what cuts the grass. A blade of grass may not have much inertia but there's enough to keep the grass standing upright as it meets an edge moving at 200 mph. String trimmers don't have aerodynamic surfaces or even an edge, yet they still cut grass due to the speed of the string.

                                              • nukestrom
                                                nukestrom  1 months back

                                                I'm a physicist but I never thought about it before. Nice one.

                                                • Ashton Raethel
                                                  Ashton Raethel  1 months back

                                                  Would the same effect happen with a whopper snipper?

                                                  • Scootersnmore
                                                    Scootersnmore  1 months back

                                                    cool video grass gets a beating for sure and sharp blade look nice even hair cut LOl

                                                    • Karl Fredrik
                                                      Karl Fredrik  1 months back

                                                      it pains me to say thius. but it's not slow enough

                                                      • Tomar Stevenson
                                                        Tomar Stevenson  1 months back

                                                        Nice because my mom 😁 like

                                                        • Michael Mebane
                                                          Michael Mebane  1 months back

                                                          Chainsaw but be safe

                                                          • eceflyboy
                                                            eceflyboy  1 months back

                                                            At time 8:08 Dustin puts his hands where the no-hand hazard label is and reaches for something.

                                                            • New Zealand
                                                              New Zealand  1 months back

                                                              Speed kills

                                                              • Benjamin Esver
                                                                Benjamin Esver  1 months back

                                                                At 0:04 imagine him just running over children with a lawn mower

                                                                • NMC4114
                                                                  NMC4114  2 months back

                                                                  Look at the Scythe and scything grass.

                                                                  • RCDai
                                                                    RCDai  2 months back

                                                                    What would have been awesome is if you hammered thap tip flap, and tried to use your lawnmower, if it still worked as well

                                                                    • harlaf420
                                                                      harlaf420  2 months back

                                                                      Question: i use a Flymo mower (yes i am not american)(we dont have a huge lawn), and flymo mowers dont have any wheels. You move them through the fact that it makes a cushion of air for the mower to "float" on, similar to a hovercraft. Wouldnt that mean that the blade pushes air down (there is an air intake at the top of the mower)? Would it mean that it relies on a cutting technique similar to a sickle/hoe(dont know the word, but the tool farmers used to cut grass like waaaay back)?

                                                                      Destin the kind of dude that makes people curious about lawn mowers

                                                                      • AustinAwsome
                                                                        AustinAwsome  2 months back

                                                                        This is the most 'dad' video.

                                                                        • Henrik Strand
                                                                          Henrik Strand  2 months back

                                                                          My grandfather own a lawnmower that uses opposing blades.

                                                                          • Ahmad Zobair Surosh
                                                                            Ahmad Zobair Surosh  2 months back

                                                                            I do not understand how does the shape of blade effects the blade to cut the grass?
                                                                            Can u help me know it better!
                                                                            I appreciate it

                                                                            • NobHack
                                                                              NobHack  2 months back

                                                                              There is zombie on your lawn

                                                                              • Fernando Barela
                                                                                Fernando Barela  2 months back

                                                                                I wonder if there's a better way? It's just ripping the grass, and I wonder how healthy it really is for it? It just seems to me that the grass goes through too much trauma. Not that it even cares, but, okay...

                                                                                • Dilu
                                                                                  Dilu  2 months back

                                                                                  This might be a dumb question but here in Argentina lawn mowers don't use blade, they used some kind of plastic string (it's usually green), do you think they would work the same way?

                                                                                  • thousand points of light
                                                                                    thousand points of light  2 months back

                                                                                    have you ever considered that you're not getting smarter, but you're actually getting

                                                                                    • Quark Csj
                                                                                      Quark Csj  2 months back

                                                                                      how about 2 opposing blades on the lawnmower

                                                                                      • Charlie
                                                                                        Charlie  2 months back

                                                                                        SHARPEN THE BLADE!!!!

                                                                                        • Don Allis
                                                                                          Don Allis  2 months back

                                                                                          Reel mowers and sickle bar mowers both use a shear motion for cutting.

                                                                                          • Peter D Morrison
                                                                                            Peter D Morrison  2 months back

                                                                                            I think it's a bit more complicated than that. The tab can't lift the grass until it has passed over it. The cut is then done by the next blade. At this point there is no more lift, so the cut is made because the mass (inertia) of the grass holds it in place as the blade passes through.

                                                                                            • Ur boi
                                                                                              Ur boi  2 months back

                                                                                              6:00 that’s why lawn mowers don’t work as well at high speeds. You drive right past it before the grass has enough time to stand back up.