1. The image of my drawing is my force diagrams for C1 and C4. Are they correct

Question

1. The image of my drawing is my force diagrams for C1 and C4. Are they correct or what am I doing wrong/incorrectly?

2. How would you match third law pairs as mentioned in C2 and C4(with friction)?

3. How would you rank the mgnitude of the horizontal forces and why as in C3?

I've been stuck for like an hour. Thank you!

Experiment C: Colliding Masses We will now attempt to measure the forces objects on each other when they exert collide, and the effects the forces have on the motion of objec This time we will same force the gentle use the sensors and ca as in part B and make (bumper to bumper) with the carts on the tracks. You need to remove the string you installed for part B and be sure the rubber stoppers are installed on the force sensors to act as bumpers. C1. Suppose you have two blocks A and B Both are made of the same material, and F applied B is more massive than A. Your hand is pushing A along a table as shown. The blocks are speeding up. First, consider the case where there is no friction between the table and the blocks. Draw Two separate free body diagrams for block A and block B. Label the forces in the form C on D, f the force is exerted by object C and felt by object D F Physics 2BL 32

Explanation / Answer

1. You need 1 force which you will understand in my answer to your 2nd question. Otherwise your free body diagrams are perfect.

2. Matching the third law pairs is a simple task.

one of them is always the Fgravity and the Fnormal mentioned in your diagram.

The other pairs are:

Assuming you are applying the force Fapplied ,say, with your finger. So the block A also applies a reaction force on your finger. Which compresses your finger a bit. (So this adds a small contact force to your diagram in this case. Name it as you prefer)

Now, the other pairs are FA on B and FB on A . These contact forces are the third law pairs. You have mentioned them perfectly.

For friction, the pairs are bit weird. The logic goes as, The frictional force the table exerts on the block and the frictional force the block exerts on the table go as third law pairs. These do not need to be mentioned in your diagram because it is the free body diagram of just the block. I hope I was clear enough in making this point. Comment if you have any doubts.

3. I think what they mean by magnitude is that you have to find the magnitude of each and every force mentioned in your free body diagrams. And then just arrange them in decreasing order of magnitude. You may have all the values calculated in your experiment.

Also remember, the contact force between the block A and the finger during application is very small and negligible.

I hope this helps. Please ask if you have any doubts or need any more help. I will try to respond immediately.

Enjoy Physics !!

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