## GBS Physics Resources

The Physics Classroom

# Henderson's Physics 163

### Chapter 3 Opening Questions

Tuesday, September 11:

A hockey player glides along the ice at a constant speed of 1.25 m/s in the positive direction onto a rough section of ice which slows him down. If he stops in 5.0 seconds, then what is the magnitude and direction of his acceleration?

Wednesday, September 12:

Mr. Henderson is heading his Yugo east (the + direction) down Lake Avenue. He is stopped at a stoplight. The light turns green and he accelerates up to top speed (10 m/s for his Yugo with no other passengers). He then maintains the speed for several seconds. Finally, he slows to a stop as the next stoplight turns yellow. See the particle model diagram (dot diagram below).

Identify the direction (east or west) of the velocity vector and the acceleration vector from A to B, B to C and C to D.

Friday, September 14:

Mr. Henderson is heading his Yugo east (the + direction) down Lake Avenue. He is stopped at a stoplight. The light turns green and he accelerates up to top speed (10 m/s) in 4.0 seconds. He then maintains the speed for 6.0 seconds. Finally, he slows to a stop over the course of 5.0 seconds. See the particle model diagram (dot diagram below).

Describe Mr. H's motion from A to B, from B to C and from C to D. Then construct a velocity-time graph depicting the 15.0 seconds of motion. Label points A, B, C and D on the graph.

Monday, September 17:

Mr. Henderson drives his Lambourghini down the tollway. Frustrated by the speed of the Corvette he is following, he accelerates from 32.0 m/s to 38.0 m/s in 3.0 seconds, he then maintains this speed for 9.0 seconds, leaving the Corvette in the dust. Sketch the velocity versus time graph for this 12.0 seconds of motion; label velocity and time axis with numerical values. Then calculate the acceleration and the change in position of the Lambourghini during the first 3.0 seconds and during the last 9.0 seconds of motion.

Tuesday, September 18:

A two-stage toy rocket has two fuel stages. During the first stage, the rocket starts on the ground and accelerates from rest to a speed of 24.0 m/s in 4.0 seconds. During the second stage, the rocket accelerates from 24.0 m/s to 32.0 m/s for 4.0 seconds. Sketch the velocity-time graph for this motion and calculate the acceleration and distance traveled during each of the fuel stages.

Alternative Opening Question: Starting from rest at an initial position of 0 meters, Mr. Henderson accelerates in his Yugo at a rate of 0.39 m/s/s for 6.8 seconds. Use the equations in Chapter 3, section 2 to determine the distance traveled and the final speed. Begin by listing known quantities and equating the quantities with variables in the equations.

Wednesday, September 19:

Mr. Henderson is heading his Yugo east (the + direction) down Lake Avenue. He is stopped at a stoplight. The light turns green and he accelerates up to top speed (10 m/s) in 4.0 seconds. He then maintains the speed for 6.0 seconds. Finally, he slows to a stop over the course of 5.0 seconds. See the particle model diagram (dot diagram below).

Sketch the velocity-time graph for the motion, describe the motion and then construct the position-time graph for the motion.

Thursday, September 20:

Grand Finale Question - passed out in class. Due on Tuesday, September 25 with the course notebook. Tape the small sheet into your notebook and write away.

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