Q1 · hard · AI-verified
A 10 kg block is pushed against a vertical wall by a horizontal force F. The coefficient of static friction between the block and wall is 0.5. What is the minimum value of F to prevent the block from sliding down? (g = 10 m/s²)
- 100 N
- 150 N
- 50 N
- 200 N
Q2 · easy · AI-verified
A net force of 10 N acts on a body of mass 5 kg. What is the acceleration produced in the body?
- 50 m/s²
- 2 m/s²
- 5 m/s²
- 0.5 m/s²
Q3 · medium · AI-verified
Which law of motion is used to explain why a rocket moves forward when gases are expelled backward?
- Newton's First Law of Motion
- Newton's Second Law of Motion
- Law of Conservation of Energy
- Newton's Third Law of Motion
Q4 · medium · AI-verified
The angle of friction is related to the coefficient of static friction (μ) by which formula?
- cos θ = μ
- cot θ = μ
- tan θ = μ
- sin θ = μ
Q5 · medium · AI-verified
A car of mass 1000 kg accelerates from rest to 20 m/s in 10 seconds on a level road. If the friction force is 500 N, what is the engine force?
- 3000 N
- 2000 N
- 1500 N
- 2500 N