IMSS - Physical Science Wednesday, July 27th

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Presentation transcript:

IMSS - Physical Science Wednesday, July 27th Review motion diagrams Tape timers Introduction to forces Forces and motion activity

Motion Diagrams How do we represent motion in a static picture? How might you describe the motion of this car?

Motion Diagrams Stationary Constant speed Speeding up Slowing down 2-D motion

Motion Diagrams Particle Model - A simplifying model in which we treat the object as if all its mass were concentrated at a single point. This model helps us concentrate on the overall motion of the object.

Displacement How fast is the car going? x (m) 0 10 20 30 40 0 10 20 30 40 Very important sequence of abstractcation How fast is the car going?

Speed assume 1 second intervals x (m) 0 10 20 30 40

Velocity assume 1 second intervals X (m) 0 10 20 30 40

Velocity Slope = rise over the run Dt Dx Slope = rise over the run The velocity is constant and positive

Displacement & Velocity Describe Jason’s drive to work time in minutes since leaving home distance from home in miles 25 20 15 10 5 0 10 20 30 40 50 slow through Hayward fast on 580 slow through Livermore

Displacement & Velocity Describe Jason’s drive to work 60 50 40 30 20 10 speed in mph 0 10 20 30 40 50 time in minutes since leaving home

Acceleration A falling object 1 2 3 intervals are 0.2 sec apart 4 1 2 3 4 5 intervals are 0.2 sec apart distance (m)

Acceleration What is the velocity?

Acceleration Acceleration – the rate of change of the velocity Slope of the vs. t graph Units: (m/s)/s = m/s2

Acceleration

Describing Motion

Ticker Tape Timers time interval fixed

Motion of a falling object 1 2 3 4 5 distance (m) a = 9.7 m/s2

Forces ... is a push or pull. ... acts on an object. ... requires an agent. ... is a vector. ... is a contact force or a long-range force.

Forces Fg = m*g The mass of the earth attracts other masses and gives rise to the gravitational force. Fg = m*g A net force on an object will lead to motion.

Forces and Motion Quantify how forces are related to motion Using the airtrack, motion sensor, and weights, design an experiment. Predict what you think will happen and make observations. Form a hypothesis and then collect data to test it. Analyze data with tables and graphs to come to a conclusion. Prepare a 2-3 minute report on your results.