1. You have a tug of war with your kid brother but he is standing on his skatebo
ID: 2260630 • Letter: 1
Question
1. You have a tug of war with your kid brother but he is standing on his skateboard. You can now make him roll across the floor (with a constant speed) when you pull hard. In the situation compare the magnitude of the force you exert on your brother ith the magnitude of the force he exerts on you. Are they the same or different? Please explain. If they are not the same, which is larger? Why or why not?
2. A small car is pushing a larger truck that has a dead battery. The mass of the truck is twice as large as the mass of the car. At one instant of time the car and the truck both have an acceleration of 1.5m/s2 . Which of the following statement is true? Defend your choice with an explanation using concepts associated with newtons laws.
A. The car exerts a force on the truck, but the truck doesn't exert a force on the car
B. the car exerts a larger force on the truck than the truk exerts on the car
C. The car exerts the same amount of force on the truck as the truck exerts on the car
D. The truck exerts a larger force on the car than the car exerts on the truck
E. the truck exerts a force on the car, but the car kent exert a force on the truck
Explanation / Answer
1)
Let force you exert is F1
Force he exert be F2
F1-F2 = ma
where m= mass of your brother
a = accelaration at which he roll son the floor.
SInce a is positive,F1>F2.
hence Force you exert will be of higher magnitude than the force he exerts.
2)
Since both of them are moving with same accelaration,Truck exerts the same force as the Car.
THis can be associated with newton's third law,as the reaction force from the truck will be exactly equal and in opposite direction as the force acting on the car.
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