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Forces and Motion

Forces and Motion. Unit F. Ant Maze. When things are in MOTION, we need to know: Distance 2. Direction. Measurement. Metric Length: meter Volume: liter Mass: gram All but 3 countries use the metric system. Used to measure with BODY PARTS. 1000 m = 1 km 100 cm = 1 m 10 mm = 1 cm.

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Forces and Motion

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  1. Forces and Motion Unit F

  2. Ant Maze • When things are in MOTION, we need to know: • Distance 2. Direction

  3. Measurement • Metric • Length: meter • Volume: liter • Mass: gram • All but 3 countries use the metric system. • Used to measure with BODY PARTS 1000 m = 1 km 100 cm = 1 m 10 mm = 1 cm

  4. Speed • Speed = distance ÷ time • Ex. Michael walked 6 mi in 3 hours. His speed was 2 mi/hr (or 2 mph)

  5. Velocity, Acceleration, and Deceleration • Velocity – speed and direction • Ex. (60 mph South) • Acceleration – any change in velocity (speed or direction) • Deceleration – slowing down 4:16

  6. Mass vs. Weight • Mass • amount of stuff in an object • measured in g or kg • Weight • measures the force of gravity pulling on an object • measured in Newtons (N) (or pounds) • The farther we are from the center of the Earth, the less gravity pulls on us (so the less we weigh) 2:04

  7. Gravity 7:43 • Gravity – pull on objects from Earth’s core • Objects fall to the ground at the same rate, no matter what size they are (assuming air resistance is not a factor, or if you are in a vacuum. ) • As an object falls to the ground, the speed of that object increases.

  8. Newton’s 1st Law 2:15 1st • Law of Inertia • Objects in motion stay in motion; Objects at rest stay at rest until acted upon by another force. 6:04 http://www.geocities.com/Athens/Academy/9208/il.html

  9. Newton’s 2nd Law • Force = mass x acceleration • Acceleration depends on the mass of the object and the strength of the force • The larger the mass, the more force you’ll have to use. • The harder you push, the faster the acceleration 2nd 2:34

  10. Newton’s 3rd Law • When one person lands on a trampoline, the other person bounces up. 3rd • For every action there is an opposite and equal reaction. 3:00

  11. Momentum • Tells the combined effect of an object’s mass and velocity. • Momentum will be transferred in a collision.

  12. Newton’s 3 Laws Bumper Car Physics

  13. Planes • Thrust - push produced by spinning propellers. • Lift - upward force caused by differences in air pressure that allows planes to rise into the air • Drag- resistance to forward motion caused by air

  14. Boats • Buoyancy – ability of liquids to keep objects afloat • Density • If the density of an object is less than 1 gram, it will float in water. • Objects are more likely to float if you can decrease the density.

  15. References • Basics of Physics: Exploring the Laws of Motion. United Learning(2004). Retrieved March 6, 2007, fromunitedstreaming: http://www.unitedstreaming.com/ • Exploring Gravity. United Learning(1993). Retrieved March 6, 2007, fromunitedstreaming: http://www.unitedstreaming.com/ • http://www.geocities.com/Athens/Academy/9208/il.html

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