A sledge of mass 25 kg is pulled across level ground with a horizontal force of 60 N. The constant force of friction is 20 N. What is the acceleration of the sledge?
Correct answer: C. 1.6 m/s2
- A. 0.5 m/s2
- B. 2 m/s2
- C. 1.6 m/s2
- D. 0.2 m/s2
Explanation
The problem asks for the acceleration of the sledge. According to Newton's Second Law, the net force acting on an object is equal to the mass of the object times its acceleration (F = ma). Here, the applied force is 60 N, and the frictional force opposing the motion is 20 N. Thus, the net force (F) is 60 N - 20 N = 40 N. Using the formula, we have:F = ma ⟹ 40 N = 25 kg × a ⟹ a = 40 / 25 = 1.6 m/s2.Therefore, the correct acceleration is 1.6 m/s2 (Option C).Options A, B, and D result from incorrect calculations of the net force or inaccurate application of the formula.
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
A particle starting from rest undergoes a rectilinear motion with acceleration a. The variation of a with time t maximum velocity attained by the particle during the motion is:
The engine of a car produces an acceleration of 6 m s-2 in the car. If this car pulls another car of the same mass, then the acceleration would be
A bullet is fired with a gun from tower horizontally with a velocity 400 m/s. at the same time, a stone is dropped from the same tower.
A swimmer of mass 60 kg dives into a deep pool from a high diving platform. She enters the water at high speed and then decelerates at a rate of 16 m/s2 as she travels vertically downwards in the water. The gravitational field strength is 10 N/kg. What is the swimmer's weight and the size of the resultant force acting on her as she decelerates?
Which graph represents the motion of a car that is travelling along a straight road with a uniformly increasing speed?
If a body starts from rest and travels 120 cm in the 6th second, then what is the acceleration