A single constant 10-pound force F_1 acts on a body, causing it to comes to acce

Question

A single constant 10-pound force F_1 acts on a body, causing it to comes to accelerate. Then while F_1 continues to act, a second constant force F_2, is applied to the body. Which comes to a momentary stop. The magnitude of F_2 is zero a bit less than 10 pounds exactly 10 pounds. Larger than 10 pounds. There is not enough information to tell The erroneous idea that an object a force on it to keep moving even at constant velocity was help by Galileo Aristotle Newton A block of mass 5.0 kg is acted upon by a single force, producing an acceleration of 2.0 m/s^2 The force has a value of 5.0 N. 10 N 2.5 N 0.5 A kg block on a smooth horizontal surface is acted upon by two forces: a horizontal force of 70 N acting to the right and a horizontal force of 30 N to the left. The acceleration of the block will be 2.3 m/s^2to the right. 4.0 m/s^2 to the right. 10.0 m/s^2 to the right. 210.0 m/s^2 to the right. Your mass is 50 kg. Suppose you are standing on a scale in an elevator that starts moving up and increases its speed at the rate of2 m/s every second. What would be the reading on the scale? 590 N. 490 N. 390 N. 100 N.

Explanation / Answer

Q14. F1 will create an acceleration of force/mass

as force is constant, this acceleration will be constant.

when F2 is applied, it will also impart a constant acceleration.

for the object to come to momentary stop, velocity has to be zero.

but as some velocity is acquired during the period in which F1 is applied,

F2 has to be greater than F1 to make the velocity decrease and become zero momentarily.

hence option D is correct.

Q15.

option B is correct.

Aristotle had that eroneous idea which was proved to be false by Galiileo.

Q16. force=mass*acceleration=5*2=10 N

hence option B is correct.

Q17.

total force is to the right with magnitude=70-30=40 N

hence acceleration=force/mass=40/10=4 m/s^2

option B is correct.

Q18. acceleration=2 m/s^2

if normal force is F(which is the reading of the scale),

then F-50*9.8=50*2

==>F=50*11.8=590 N

option A is correct.

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