Introduction to Motion Motion in One Dimension. Basic Vocabulary Scalar quantity: A quantity with only a magnitude. (weight, time) Vector quantity: A.

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Presentation transcript:

Introduction to Motion Motion in One Dimension

Basic Vocabulary Scalar quantity: A quantity with only a magnitude. (weight, time) Vector quantity: A quantity with a magnitude and direction The direction can be a + or a – 45 m/s. 75 mph east. -4 m/s 2 For starters…

Basic Vocabulary/Concepts Distance vs. Displacement: (already have notes) Speed vs. Velocity Speed is a scalar quantity, velocity is a vector quantity Reference frame: from where is this system being observed? “is the object moving toward you or away?” Rate: How something change over time Velocity: the rate of change in distance Acceleration: the rate of change in velocity

The Distance Formula d f = d i + vt +at 2 2 This is the full distance formula. Most of the time you won’t need the entire thing. (If there is no acceleration, that whole part equals zero.)

Setting a Reference Frame Reference Frame Generally, the positive direction is toward the right m/s m/s Reference Frame

For objects moving vertically, positive is generally away from the surface (and you). 375 m/s m/s Reference Frame There may be times when you want to have a different reference frame, but make sure your math is ALWAYS consistent with your reference frame!

Steps to Solving Physics Problems 1.Draw a picture with a reference frame. 2.Label quantities you know. Make sure you’re using consistent units. 3.Write out needed formulas and solve algebraically for the unknown variable. Figure out what you need to do. 4.Plug in the values you know into the formula and solve. Sometimes you need to solve one formula to get a value for a second formula.

Solving Motion Problems in One Dimension A snail is moving at 0.01 m/s across a road. How long will it take before it travels 20 meters?

Solving Motion Problems in One Dimension A second snail starts on the other side of the road and moves toward the first snail at 0.02 m/s. Where on the road is that snail after 45 seconds?

Solving Motion Problems in One Dimension A snail starts crossing a 20 meter road at 0.01 m/s. At the same time, a second snail begins to cross the same road in the opposite direction at 0.03 m/s. Where do they meet on the road and how long does it take?

Solving Motion Problems in One Dimension A car that is already 1.5 km down the road is moving at a constant velocity of 15 m/s. Another car turns onto the same road and travels at twice the velocity as the first car. How far down the road do they meet and how long does it take?