A two-car train, with data as given in Fig. is pulled by a child on a horizontal frictionless surface. The strings are massless. The force exerted by car A on the string S is:
Correct answer: D. 15N
- A. 10N
- B. 20N
- C. Zero
- D. 15N
Explanation
To solve this problem, use Newton's second law, F = ma. First, find the total mass of the two-car system. Then, determine the acceleration by dividing the total force applied by the total mass. Since the surface is frictionless, the force exerted by car A on the string S is equal to the mass of car A multiplied by the common acceleration. The correct force is 15N. Other options are incorrect because they either do not consider the entire system or miscalculate the acceleration.
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
If a car at rest accelerates uniformly to a speed of 144km/h in 20 s. Then it covers a distance of
If a body starts from rest and travels 120 cm in the 6th second, then what is the acceleration
Which graph represents the motion of a car that is travelling along a straight road with a uniformly increasing speed?
An object is projected upwards with a velocity of 100 m/s. It will strike the ground after (approximately)
When force of 1 N is applied on a body of mass 100 g then the acceleration would be
A mass of 10 kg moves with an acceleration of 10 m s-2, the force on it is