So what is my concluding sentence?

Less force means less chance of pain or injury

Add the torque from the bar, Read the question again

What is the first thing you do?

Use C=2*pi*r to find the circumference, divide by two, and that is distance, Read the question!

There is now no force, so by Newton's first law, velocity stays the same

Which direction is acceleration?

Towards the centre of the circle

What is the key insight you need to answer this question?

Split the run into two time periods, and calculate each time separately

How do the velocities of the balls change

The vertical velocity changes by gravity, horizontal velocity is constant

What do you do for the first section of the run?

Use a kinematic equation to solve for the time

State that it must be supported by the same torque from R

Why does more time help?

More time means less force, change in momentum = force time change in time

Which direction is velocity?

Tangent to the circle, going up

Which ball is traveling faster when it hits the ground?

The rolled one because it has more horizontal velocity

What are your givens?

Distance, initial and final velocity

Which ball hits the ground first?

They both hit the ground at the same time

What is the main difference between the fat mat and the sawdust?

The fat mat has more cushioning

What do you do for the second section of the run?

Calculate time by doing distance divided by velocity

What information is the question telling you

Alex accelerates to 9.2ms-1 at the beginning, then stays at this speed

Why does this make a difference?

Because you take more time to slow down

How do you find loss of speed?

Using the momentum change and dividing by mass

Which direction will it go when it is released at R?

Tangent to the circle, going a little bit above right

What is the question asking you to do?

Show that acceleration is 10ms-2

Use a kinematic equation and solve the quadratic you get from that, I'm done though, right? Wait, maybe I should reread the question..., Find the time taken to get to maximum height, then time to land, and add

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Topic test review

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This is a review of a topic test my Physics students took

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Questions 39

Answers

1
So what is my concluding sentence?
Uhhhh, that was it
Less force = good
So this is preferable to the other jump
Less force means less chance of pain or injury
2
Now what?
Add the torque from the bar
Read the question again
Divide by the distance
I'm done
3
What is the first thing you do?
Use C=2*pi*r to find the circumference, divide by two, and that is distance
Find the velocity by distance over time. 0.76/0.34
Read the question!
What's that smart person doing for this question?
4
Which kinematic equation do we use?
vf=vi+at
d=vit+1/2at2
vf2=vi2+2ad
d=(vi+vf)/2 * t
5
What is the first thing you do for an exam question?
Read the question
Look at what other people did
Panic!!!
Jump in and give it a go
6
Why?
Because it just does man! Fizzics!
Because the force is now transfered to going in that direction
Centrifugal force pushes the discus out of the circle
There is now no force, so by Newton's first law, velocity stays the same
7
Which direction is acceleration?
Away from the centre of the circle
Towards the centre of the circle
Tangent to the circle, going up
Tangent to the circle, going down
8
What is the distance we use for the question?
9.2m
10m
4.1m
100m
9
To find the torque from the bar, I need to multiply the weight by
3
0.35
3.35
1.5
10
So for the torque from the bag, I need to multiply the force by
3
3.35
0.35
1.5
11
Now what?
What is that smart person answering?
Divide by 3
I'm done
Divide by 0.35
12
What is the key insight you need to answer this question?
Split the run into two time periods, and calculate each time separately
Calculate time by doing distance divided by velocity
I could run that fast!
Use a kinematic equation to solve for the time
13
How do the velocities of the balls change
They change cuz physics man!
The velocities increase because of gravity
The balls both travel at the same velocity
The vertical velocity changes by gravity, horizontal velocity is constant
14
How do you find momentum?
mass times velocity
mass over velocity
15
What is the question asking you to do?
Explain why it accelerates slower
Why they fall with the same acceleration
Explain why it is heavier
All of the above
16
What do you do for the first section of the run?
Just start mashing the numbers together. It'll work out somehow
BURN THE EXAM PAPER!!!!!
Calculate time by doing distance divided by velocity
Use a kinematic equation to solve for the time
17
Now what?
What is that smart person answering?
I'm done
Divide by the distance
State that it must be supported by the same torque from R
18
Why does more time help?
More time means your body can react and get into a good falling position
Because I like slow mos
Because I want to savor the jump
More time means less force, change in momentum = force time change in time
19
What do I need to consider in any exam question
Relating it to context!
Why am I doing this again?
How my hair looks during the exam
What are people around me answering?
20
Which direction is velocity?
Tangent to the circle, going up
Away from the centre of the circle
Tangent to the circle, going down
Towards the centre of the circle
21
Which ball is traveling faster when it hits the ground?
The same because gravity affects them both equally
The dropped one because the roll slowed the other ball down
The rolled one because it has more horizontal velocity
When they hit the ground they'll have stopped, so it is a trick question
22
What are your givens?
distance, acceleration, time
Distance, acceleration, velocity
Distance, initial and final velocity, acceleration
Distance, initial and final velocity
23
After reading the question, what should you do first?
Find the distance traveled
Find the time to reach maximum height
Find the vertical velocity
Read the question
24
Which ball hits the ground first?
The rolled one because it is going faster
The dropped one because the rolled one has to travel further
They both hit the ground at the same time
I wonder if I can try this out in the exam without the teacher noticing...
25
What is the main difference between the fat mat and the sawdust?
The fat mat has more cushioning
I don't like sawdust
The fat mat is easier to move than the sawdust, and so it's more convenient
26
To calculate the force on the right peg, I need to consider the torque around
The right peg
The bag
The left peg
The center of gravity
27
What is the physics principle?
Newton's laws
Conservation of momentum
Kinetic energy
There is none, duh
28
What will be our final answer?
10.33ms-2
9.2ms-1
20.48ms-2
10ms-2
29
What masses do I need to consider
The bar
The bag
Both
Neither
30
What do you do for the second section of the run?
Just start mashing the numbers together. It'll work out somehow
Use a kinematic equation to solve for the time
BURN THE EXAM PAPER!!!!!
Calculate time by doing distance divided by velocity
31
What information is the question telling you
Alex accelerates to 9.2ms-1 at the beginning, then stays at this speed
Alex travels at 9.2ms-1 the whole time
Alex accelerates to 9.2ms-1 over the whole 100m
TIME TO PANIC!!!!
32
What equation(s) will you use to do this question?
acceleration is velocity over time
Kinematic Equations
Kinetic Energy
velocity is distance over time
33
Why does this make a difference?
Because the spring constant is different
Sawdust is icky man!
Because you take more time to slow down
What did that other person write?
34
I should always read the question again after I think I have answered it
True
False
35
How do you find loss of speed?
Using the momentum change and dividing by mass
There is none, duh
The bar sped up, so Archie would slow down by the same amount
Gravity as he is in the air
36
Which direction will it go when it is released at R?
Towards the centre of the circle
Tangent to the circle, going a little bit above right
Tangent to the circle, going up
Tangent to the circle, going right
37
What is the question asking you to do?
Find the velocity
Show that acceleration is 10ms-2
Find the acceleration
Show that velocity is 9.2ms-1
38
Now what do you do?
Use a kinematic equation and solve the quadratic you get from that
I'm done though, right? Wait, maybe I should reread the question...
Find the time taken to get to maximum height, then time to land, and add
Use trig and work out the horizontal distance
39
What are you looking for when you read the question?
Context
All of the above
What is it asking me to do?
What are my key values

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