GSC101 Assignment 1 Solution Fall 2017
#1
General Science GSC101
Assignment 1: (Fall 2017)

Solution


Question # 1
Write at least name of five devices which work under the principles of Physics.
Hint: For example Ultrasound machine. Marks = 5

Answer:

  1. GPS devices
  2. LCD and LED devices
  3. X-Ray Machine
  4. Computers
  5. Mobile devices
Question # 2
A heavy 2.0Kg ball is moving at 10m/s when it is caught. A light 1.5Kilogram ball is travelling at 20m/s when it caught. Which ball required the greater impulse?


a) The 2.0kg ball because it is more massive.
b) The 2.0kg ball because it had more momentum
c) The 1.5kg ball because it was travelling faster
d) The 1.5 kg ball because it is more momentum
e) The question can’t be answered without more information. 

Marks = 10 (4+6)
Note: Choose the best option from “a” to “e” and write the reason of your above selected choice as well.

Answer:
d) The 1.5 kg ball because it is more momentum
Reason: 1.5 kg ball has momentum of 30 kg*m/s, which is greater than 20 of 2.0 kg ball. And Impulse is also equal to the change in momentum, hence 1.5 kg ball will have greater impulse due to its greater momentum. 

Question # 3
In the classic horse and cart problem, a horse is attached to a cart that can roll along on a set of wheels. Which of the following statement is true? Also explain the reason of your selected choice as well.


a) The horse pulls on the cart with a force, and the cart pulls, back on the horse with an equal force.
b) The horse pulls on the cart with a force greater than the force that the cart pulls back on the horse.
c) The horse pulls the cart forward, because of a time delay between the action and reaction forces.
d) The horse pulls the cart forward, but only if the horse has a mass greater than the mass of the cart.
e) The horse pulls the cart forward because the force of friction forward is greater than the force of the wagon backward.
Marks = 10 (4+6)
Note: Choose the best option from “a” to “e” and write the reason of your above selected choice as well.

Answer:
b) The horse pulls on the cart with a force greater than the force that the cart pulls back on the horse.
Reason: 
The horse moves because the force he exerts is greater than the force by the cart pulling him back. The horse exerts force with his hooves on the ground and the ground pushes forward with an equal force, If the horse pushes back the ground with a force greater than the cart's resisting force, then the horse will move.
  


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