14)da ans is a
15)its b
A)Because your overall inertia is down
B)Because you would be accelerating up
C)Because you are weightless
D)It would help you survive
I got C
15)If a horizontal force applied on a resting object is greater than the force of friction, the object will.
A)move at a constant velocity
B)accelerate in the direction of the applied force
C)move backwards
D)stay at rest
I got B
15)its b
By jumping up you reduce the velocity w.r.t. to the ground a bit, so when the bottom of the lift hits the ground and stops, you are moving toward the ground at a lower speed.
In 15 all options are wrong. You are supposed to answer B) but strictly speaking that is not right because the applied force does not need to point in the direction opposite to the friction force.
In 15, Iblis is refering to the possiblity of friction with a directional bias, such as one might abtain when sliding on a grooved surface where the groves are inclined to the applied force. They want you to answer B, but is not always true.
15) The correct answer is B) accelerate in the direction of the applied force. If a horizontal force is applied on a resting object and it is greater than the force of friction, the object will start to accelerate in the direction of the applied force. The force of friction is a resistive force that acts to oppose the movement of the object. When the applied force exceeds the force of friction, the object overcomes the resistance and starts to move in the direction of the applied force.