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“Think First” MCs - Kinematics. Partner up Whiteboards ready Write legibly and BIG-ly Take pictures to help you remember later. x.

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Presentation Transcript

• Partner up

• Write legibly and BIG-ly

A stoplight (which is considered to be at the origin) 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.

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

to = 0 s

xo = + 20 m

vo = – 12 m/s

a = – 6.0 m/s2

Which of the following is labeled wrong?

1 xo

2 vo

3 a

4 a & vo

5 all of the values are correct

A stoplight (which is considered to be the origin) 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.

x

A student in a physics class made a picture of the situation but did not include the signs of the variables.

to = 0 s

xo = __ 20 m

vo = __ 12 m/s

a = __ 6.0 m/s2

What are the signs of the three missing variables?

xovoa

1 + – –

2 + – +

3 + + –

4 + + +

5 – – +

v 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/sfinal

vinitial

a

x

t

1

2

3

v

v

v

t

t

t

v

4

The motion of a car is represented with the motion diagram below. The stoplight is at the origin.

Which graph best matches the motion diagram?

• No graph represents the motion correctly

3 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/s

1

2

x

x

x

t

t

t

4

x

t

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?

• No graph represents the motion correctly

t 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/s

v

A bicycle is moving on the road. Its motion is described by the graph below.

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?

v = vo + a t

voa

1 + –

2 + +

3 – +

4 – –

A person throws a ball up in the air at 5 m/s.

Which set of equations best matches this process?

1. Vf = (5.0 m/s) + (10 m/s2) t

2. Vf = ( - 5.0 m/s) + (10 m/s2) t

3. Vf = (5.0 m/s) + ( - 10 m/s2) t

4. Vf = ( - 5.0 m/s) + ( - 10 m/s2) t

5. Either 2 or 3 are correct

2 picture.

3

x

1

x

x

t

t

t

4

x

t

The mathematical representation seen below is in a physics textbook.

Which graph best represents this situation?

• Graphs 3 & 4

• Graphs 2, 3 & 4

• No graph represents the motion correctly

Which description 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.

v physics book.

x

t

t

Alan sees the following three diagrams next to each other in his physics book.

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.

• None of the diagrams are consistent.

v physics book.initial

vfinal

x

+

A car is moving along the road as seen in the motion diagram below.

Which set of equations best matches this process?

1. Vf = (5.0 m/s) + (10 m/s2) t

2. Vf = ( - 5.0 m/s) + (10 m/s2) t

3. Vf = (5.0 m/s) + ( - 10 m/s2) t

4. Vf = ( - 5.0 m/s) + ( - 10 m/s2) t

5. Either 2 or 3 are correct