A 5 kg crate on a rough horizontal floor is pushed by a horizontal force of 40 N. The coefficient of kinetic friction is 0.25. Taking m/s, find the acceleration.
Answer and explanation
Correct answer: D. 5.55 m/s
- Step 1: Friction N.
- Step 2: m/s.
Answer
5.55 m/s.
Why not the others: 8 m/s: friction is ignored. 10.45 m/s: friction is added instead of subtracted. 27.75 m/s: the net force is not divided by the mass.
Practise more Mechanics.
Free questions with an explanation for every one, and full timed Leaving Cert Ireland mock tests.
More Mechanics questions
- A 10 kg crate on a rough horizontal floor is pushed by a horizontal force of 60 N. The coefficient of kinetic friction is 0.5. Taking…
- A 10 kg crate on a rough horizontal floor is pushed by a horizontal force of 30 N. The coefficient of kinetic friction is 0.25. Taking…
- A 1 kg object moves in a horizontal circle of radius 0.5 m at a constant speed of 6 m/s. What is the centripetal force acting on it?
- An object moves uniformly on a circle of radius 2 m with a period of 2 s. What is its speed?
- An object moves uniformly on a circle of radius 5 m with a period of 10 s. What is its speed?
- A spring of spring constant 100 N/m is stretched by 0.02 m. What is the restoring force?