   # Physic Lab

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Topics: Force, Mass
The Relationship Involving Acceleration, Net Force, and Mass

Giho Park

Purpose
The purpose of this lab investigation is to observe the relationship among the net force, mass, and acceleration of an object.

Hypothesis/Prediction
Part A
If the net force increases with a constant mass, then the acceleration would increase, because the force would push the object to increase the velocity.

Part B
If the mass of the cart increases with a constant net force, then the acceleration would increase because the greater inertia of the object would cause the acceleration to decrease.

Materials ticker timer, ticker tape, cart, masking tape, one 2-m board, marker, ruler, spring scale, three 100-g masses, two 1.0-kg masses, string,

Procedure
Part A: Acceleration and Net Force
1. Verify that the equipment you intend to use is functioning properly.
2. Measure the mass of the cart and record it in the observation table.
3. Set up the apparatus so that the least net force will act on the cart. Allow the motion to occur and obtain the data required to find the acceleration α1.
4. Repeat the procedure with an increased net force. For example, you can transfer one of the 100-g masses from the cart to the string hanging over the pulley. This allows the mass of the system to remain constant. Determine the data for α2.
5. Repeat the procedure with the highest net force to determine the data for α3.

Part B: Acceleration and Mass
6. Use the data for α3 as the first set of data in this part of the experiment. Call the acceleration α4.
7. Keep the net force constant at the highest value, but add a 1.0-kg mass to the cart. Perform the trial to obtain the data for α5.
8. Add another 1.0-kg mass. Repeat the step to determine the data for α6.

Observations
Trial Total mass of system (kg) Net force
(N [fwd]) Time (s) Displacement
(m [fwd]) Acceleration (m/s2 [fwd]) Ratio of net force to mass (N/kg)
α1 1.1 1.0

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