# A student in a physics class made a picture of this.

## Presentation on theme: "A student in a physics class made a picture of this."— Presentation transcript:

A student in a physics class made a picture of this.
A stoplight 20 m to the west turns yellow. Your car is traveling west at 12 m/s. You hit the brakes and decelerate at a rate of 6.0 m/s2. Your car stops before it reaches the stoplight (which is considered to be at the origin). A student in a physics class made a picture of this. x to = 0 s xo = + 20 m vo = – 12 m/s a = – 6.0 m/s2 Which of the following is labeled wrong? Did the student mislabel anything? 1 xo 2 vo 3 a 4 a & vo 5 all of the values are correct

What are the signs of the three missing variables?
A stoplight 20 m to the west turns yellow. Your car is traveling west at 12 m/s. You hit the brakes and decelerate at a rate of 6.0 m/s2. Your car stops before it reaches the stoplight (which is considered to be at the origin). A student in a physics class made a picture of the situation but did not include the signs of the variables. x to = 0 s xo = __ 20 m vo = __ 12 m/s a = __ 6.0 m/s2 What are the signs of the three missing variables? xo vo a 1 + – – 2 + – + 3 + + – 5 – – +

Which graph best matches the motion diagram?
The motion of a car is represented with the motion diagram below. x vinitial vfinal a Which graph best matches the motion diagram? Construct a velocity versus time graph to best match the motion diagram and picture. v t 2 v t 3 v t 1 v t 4 No graph represents the motion correctly

Which graph is the best representation of the car’s motion?
A stoplight 20 m to the west turns yellow. Your car is traveling west at 12 m/s. You hit the brakes and decelerate at a rate of 6.0 m/s2. Your car stops before it reaches the stoplight (which is considered to be at the origin). Which graph is the best representation of the car’s motion? Construct a position versus time graph that is the best representation of the car’s motion. x t 2 x t 1 x t 3 t x 4 No graph represents the motion correctly

Below is a mathematical description of the same motion.
A bicycle is moving on the road. Its motion is described by the graph below. v t Below is a mathematical description of the same motion. What should the signs of vo and a be to be consistent with the above graphical description? vo a – –

A hot air balloon is stationary in the sky as seen in the picture.
A person throws a ball up in the air at 5 m/s. Which set of mathematical representations best matches this process? Construct a mathematical representation that best matches this process. 1. Vf = (5.0 m/s) + (10 m/s2) t 2. Vf = ( m/s) + (10 m/s2) t 3. Vf = (5.0 m/s) + ( - 10 m/s2) t 4. Vf = ( m/s) + ( - 10 m/s2) t 5. Either 2 or 3 are correct

1 a∆t ∆t v x xf + = x > v  a 
The mathematical representation seen below is in a physics textbook. > a v x o 2 1 a∆t ∆t v x xf o + = Construct a position versus time graph to best represent this situation. Which graph best represents this situation? Graphs 3 & 4 Graphs 2, 3 & 4 No graph represents the motion correctly x t 2 x t 1 x t 3 t x 4

a∆x v vf a∆t ∆t x xf 2 1 + = / 10 20 5 s m a v x - =
Susy sees the mathematical representation below in her physics book. a∆x v vf a∆t ∆t x xf o 2 1 + = 2 / 10 20 5 s m a v x o - = Which description best represents this situation? Construct a verbal description that best represents this situation. This is a car that is moving to the right and is accelerating in the same direction. A ball was thrown upwards in the air at a speed of 20 m/s. A ball was thrown downwards at a height of 5 m at a speed of 20 m/s.

What are the signs of the three missing variables?
Your car is initially at rest but then stoplight turns green. You speed up toward east at a rate of 5.0 m/s2. The stoplight is now 25 m to the west of you and you are traveling east at speed of 16 m/s. The stoplight is considered to be at the origin. A student in a physics class made a picture of the situation but did not include the signs of the variables. xf = __ 25 m vf = __ 16 m/s a = __ 5.0 m/s2 x What are the signs of the three missing variables? xf vf a 1 + – – 2 – – + 3 – + – 5 – – +

A car is moving along the road as seen in the motion diagram below.
x + vfinal vinitial Which mathematical representation below could match this process? Construct a mathematical representation that could match this process. 1. Vf = (5.0 m/s) + (10 m/s2) t 2. Vf = ( m/s) + (10 m/s2) t 3. Vf = (5.0 m/s) + ( - 10 m/s2) t 4. Vf = ( m/s) + ( - 10 m/s2) t 5. Either 2 or 3 are correct

a∆x v vf a∆t ∆t x xf 2 1 + = / 10 -20 5 s m a v x - =
Bobby sees the mathematical representation below in her physics book. a∆x v vf a∆t ∆t x xf o 2 1 + = 2 / 10 -20 5 s m a v x o - = Which description best represents this situation? Construct a verbal description that best represents this situation. This is a car that is moving to the right and is accelerating in the same direction. A ball was thrown upwards in the air at a speed of 20 m/s. A ball was thrown downwards at a height of 5 m at a speed of 20 m/s.

A car is moving along the road as seen in the motion diagram below.
x + vfinal vinitial Which mathematical representation below could match this process? Construct a mathematical representation that could match this process. 1. Vf = (5.0 m/s) + (10 m/s2) t 2. Vf = ( m/s) + (10 m/s2) t 3. Vf = (5.0 m/s) + ( - 10 m/s2) t 4. Vf = ( m/s) + ( - 10 m/s2) t 5. Either 2 or 3 are correct

Which graph best matches the motion diagram?
The motion of a car is represented with the motion diagram below. x vinitial vfinal a Which graph best matches the motion diagram? Construct a velocity versus time graph to best match the motion diagram and picture. v t 2 v t 3 v t 1 v t 4 No graph represents the motion correctly

Which graph is the best representation of the car’s motion?
A roller coaster is rolling down a hill, speeding up at a rate of 8 m/s2. Which graph is the best representation of the car’s motion? Construct a position versus time graph that is the best representation of the car’s motion. x t 2 x t 1 x t 3 t x 4 No graph represents the motion correctly

Which mathematical representation below could match this process?
A skateboarder is moving along the road as seen in the motion diagram below. + vfinal vinitial Which mathematical representation below could match this process? Construct a mathematical representation that could match this process. 1. Vf = (5.0 m/s) + (10 m/s2) t 2. Vf = ( m/s) + (10 m/s2) t 3. Vf = (5.0 m/s) + ( - 10 m/s2) t 4. Vf = ( m/s) + ( - 10 m/s2) t 5. Either 2 or 3 are correct

Alan sees the following three diagrams next to each other in his physics book.
v t a t A B C Are these three diagrams consistent with each other? Yes, all three diagrams are consistent. No, Diagram A is not consistent with the other two. No, Diagram B is not consistent with the other two. No, Diagram C is not consistent with the other two.