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“Think First” MCs - Kinematics

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- Partner up
- Whiteboards ready
- Write legibly and BIG-ly
- Take pictures to help you remember later

x

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?

1xo

2vo

3a

4a & vo

5all 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––+

vfinal

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

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

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 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 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

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

Susy sees the mathematical representation below in her physics book.

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

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.

vinitial

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