Three books A, B, and C are placed on each other with A on top, B in mid, and C at bottom. If the weight of A is 2N, B is 5N and that of C is 4N, what is the total force being exerted on book B?
Correct answer: C. 7N
- A. 11N
- B. 5N
- C. 7N
- D. 6N
Explanation
Force acting on B = Weight of A + Weight of B (because the weights are pointed in same direction)Note that the weight of C is not included here in the sum, because it is not acting on B itself, but on the surface on which the books are placed.Force on B = 2N + 5NForce on B = 7N downward
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Force and Motion
Displacement, velocity and acceleration describe motion, including the horizontal and vertical components of projectile motion. The chapter connects these quantities with Newton's laws, momentum and impulse, then applies conservation of momentum to collisions, distinguishing elastic collisions from inelastic ones.
Practise Force and Motion
1,416 free Force and Motion MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Physics questions like this
Physics is on 16 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Force and Motion questions
Rain is vertically down with the velocity of 30m/s, a wind blows from north to south direction with 10m/s then at what angle should the umbrella be held and in which direction.
(1, 1, 1) . (2, 2, 2)
What is the angle made by the vector - i - 5j with x-axis?
A balloon going upwards with a velocity 12m/s. It releases a packet when it is at a height of 65m from ground. How much time the packet will take to reach the ground if g=10m/s2.
Newton's third law of motion is for the bodies that are:
A person has to cover a distance of 6km in 45 minutes. If he covers one-half o the distance in two thirds of the total tome; to cover the remaining distance in the remaining time, his speed (in km/hr) must be: