Weight and mass refer to two different quantities. True False Save Question 4 (1

Question

Weight and mass refer to two different quantities. True False Save Question 4 (1 point) Imagine you are holding a bag. What is the minimum force you have to apply to the bag to keep it from falling? O The force you apply must be larger than the weight. O The force you apply is equal to the weight. O The force you apply has the same magnitude as the weight, but has an opposite direction O The force you apply must be smaller than the weight. Save Question 5 (1 point) Two identical 1 kg masses (A & B) move horizontally with constant velocity on a frictionless surface. The masses are then acted on by horizontal forces, but the force that acts on mass A has a magnitude twice as large as that which acts on mass B. Which of the following is true? O Masses A and B have the same acceleration O The masses are not accelerated O Mass A has an acceleration twice as large as mass B O Mass A has an acceleration half as large as mass B Save

Explanation / Answer

3) True

mass is the total amount of material of a body.It is units are kilogram(kg), gram(gm) etc. It remains same everywhere.For example mass of a ball is same in earth and moon

Weight is actually force exterted on a body by gravity.Its units are kilogramforce(kgf) , Newton (N).

it change with location, Weight of a body is less in moon than earth due to low gravity in moon

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Q 4) Option 3 is the correct answer

if we apply a larger force than the weight of the bag, we will raise the bag than holding it

if we apply a smaller force tha the weight of the bag , then we lower the bag

We HAVE to apply a equal and opposite force to HOLD the bag steady.it is important to specify direction . we are applying a force opposite to the gravity(option 2 is wrong since no direction is mentioned)

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Q5) Option 3 is correct(mass A has an acceleration twice as large as Mass B )

Here both mass are identical (1kg Given)

now Force = Mass * Acceleration

Force is directly proportional to acceleration

when we apply a force F on mass B and a force 2F on mass A, since mass remains same Mass A will experince TWICE the acceleration as that of mass B

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Q1 ) option 3

Force = Mass * Acceleration,

acceleration= Force/mass

acceleration depends on the mass(option 4 is wrong)

since both bodys are connected in SUCH A WAY that when 1 body starts moving other one gets pulled along

SO acc. depends on mass of BOTH bodys

Acc= Force(Mass1+Mass2)

Note:eventhough both bodys are connected if both bodys didnt move at the same time when force is applied, only consider that body which is moving

Q2) Option 3

Option 1 is wrong(both force are equal bot not acting in opposite direction,so they dont cancel each other.body will move)

Option 2 is wrong (small force. box is not fixed so it will not be ripped)

option 4 is wrong(box is at rest.if it starts moving from rest ,velocity is not constant)

Option 3 is correct(forces are acting prependicular to each other. resultant force will at at 45 deg

3rd quadrant since Fy is +ve and Fx is negative

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