https://www.khanacademy.org/science/class-7-science/x0c8b40bd4b242f0b:energy/x0c8b40bd4b242f0b:energy-loss-and-its-causes/v/is-friction-necessary 2025-06-15T10:36:52.588065596Z Is Friction necessary? Discover why friction is both a helpful and troublesome force in our daily lives. Learn how friction works, when it’s necessary, and smart ways to increase or reduce it with real-life examples and cool demonstrations. Chandan Ganotra video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Is Friction necessary? Discover why friction is both a helpful and troublesome force in our daily lives. Learn how friction works, when it’s necessary, and smart ways to increase or reduce it with real-life examples and cool demonstrations. https://cdn.kastatic.org/ka-youtube-converted/eKEnL9mtLlw.mp4/eKEnL9mtLlw.mp4 556 Is friction necessary? https://www.khanacademy.org/science/class-7-science/x0c8b40bd4b242f0b:energy/x0c8b40bd4b242f0b:energy-loss-and-its-causes/e/is-friction-necessary 2026-04-02T06:43:34.981355205Z ⁠Is friction necessary? ⁠Is friction necessary? Chandan Ganotra exercise