Expt 2: Air track

You have an air track that is 1.5 m long.
>>>> What is an air track? _____

You use a block that is 3 cm high under one end of the air track. This makes the air track into an inclined plane.
>>>>How many meters is 3 cm? __

>>>>Draw a picture showing the air track inclined plane.
>>>>Put the length, height, angle on your diagram.


>>>>What is the angle that the air track now makes with the horizontal? ____

From what height does the ball fall as it rolls down the track which is 1.5 m long and 3 cm high?
>>>>That is what is the y component of the displacement? ____

>>>>What is the acceleration of the glider as it moves down the incline? _____

>>>>How long will it take the glider to get from the top to the bottom of the track? ____



Repeat these questions for a 6cm block inserted under one end of a 1.5 m long air track.

How many meters is 6 cm? ____

What angle does the track now make with the horizontal? ___

What is the height through which the ball falls? ____

What is the acceleration of the glider? ____
How long will it take the glider to reach the bottom? _____

Expt 3: Atwood Machine

1) You have an unbalanced force of 5 g acting on a mass of 2500g. What is the acceleration? ______

2) You have 2 weights attached to a string hung over a frictionless bar (see diagram page 27 of lab manual). Mass 1 is 2500 g.

If Mass 2 is 2501 g what is the acceleration? ____
If Mass 2 is 1995 g what is the acceleration? _____
If Mass 2 is 2505 g what is the acceleration? ____
If Mass 2 is 1990 g what is the acceleration? _____
If Mass 2 is 2510 g what is the acceleration? ____
If Mass 2 is 2500 g what is the acceleration? ____

Make a graph of the acceleration vs. the mass of 2.
Make a graph of the acceleration vs. the difference between Mass 1 and Mass 2.
 

Expt 4: Centripetal force

1) If it takes 50 s for an object to carry out 30 revolutions, what is the period of rotation? (USE THIS SPEED FOR QUESTIONS 2 & 3)

2) What is the velocity of an object 10 cm from the center of rotation?

3) What is the centripetal force on a 70 gm mass spinning 10 cm from the center of rotation?
 

Expt 5: Linear Momentum

1) How fast will a ball be going after falling 32 cm (no friction)?

2) A ball has an x velocity equal to the y velocity found in part 1.
How far ( in the x direction ) will it travel as the ball falls 32 cm?
Draw a diagram describing the motion of this ball.

Expt 6: Buoyancy

You have a 29 cm3 block of Al (2700 kg/m3) on a string.

What is the tension in the string that suspends the block if the block is suspended in:

1) In vacuum

2) In air

3) In water

Expt 7: Elasticity

1) Fill in the table and make of plot of the displacement (x) vrs the mass (m) for a spring with a force constant of 230 N/m

mass	x
100g
200g
300g
500g
1000g

2) Sketch the harmonic motion (position (x) as a function of time) for a spring where A= 0.04 m and the period is 0.55 s.

Last modified: Tue, Mar 12, 2002

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