This is physics 100 andout. explatned in the Experimental Apparatus section earl

Question

This is physics 100 andout. explatned in the Experimental Apparatus section earlier in the 2. Inelastic Collisions: 10. Repeat steps 4-8 with the carts now switched for inelastic collisions and record these as Trials 4-6 in Table I. When you finish, complete Table II and Table III. 1: What does it mean to say that some physical quantity (like energy or momentum) is conserved? How is conservation of energy different from conservation of momentum? QUESTION 2: In this lab, we could define an internal force as one shared by the two carts and an external force as one shared by one cart (or the other) and its surroundings. Would we consider an internal force as one that would conserve momentum? Would we consider an external force as one that would conserve momentum? Explain QUESTION 3: What would be you most likely sources of error in your data? (Hint: Consider the external forces.) QUESTION 4: From your experimental data, do you agree that elastic collisions conserve both momentum and energy? From your experimental data, do you agree that inelastic collisions conserve momentum but not energy? Explain. QUESTION 5: If the change in energy ( E- Ef-Ei) of a system due to a collision is negative this mean the system lost or gained energy? -no aun

Explanation / Answer

1)

Conservation of a quantity means its total value remains same before and after an event of a system
When conservation of energy occurs, there may be more than one forms of energy. But momentum is only one type.

2)

Internal force will provide same impulse to both bodies and hence change the momentum equal and opposite. External whereas cannot.

3)

Frictional forces change the data often.

4)

Elastic collisions do not spend energy in restitution. Hence, momentum and energy both conserved. Inelastic collisions spend some energy in restitution which cannot be regained. Hence, only momentum conserved.

5)

It means final energy is less. Means energy is lost by the system.

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