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Q1. How much work is done when a force of 10 N moves an object 5 m in the direction of the force?
Solution:
Work = Force * Distance = 10 N * 5 m = 50 J.
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Q2. An object is lifted vertically 4 m against gravity. If the mass of the object is 3 kg, what is the work done against gravity? (g = 9.8 m/s²)
Solution:
Work done (W) = mgh = 3 kg × 9.8 m/s² × 4 m = 117.6 J.
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Q3. An object is moving with a speed of 15 m/s and has a mass of 3 kg. What is its kinetic energy?
Solution:
Kinetic Energy (KE) = 0.5 × m × v² = 0.5 × 3 kg × (15 m/s)² = 0.5 × 3 × 225 = 337.5 J.
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Q4. A 15 kg object is moving at a speed of 4 m/s. What is its kinetic energy?
Solution:
Kinetic Energy (KE) = 0.5 × m × v² = 0.5 × 15 kg × (4 m/s)² = 0.5 × 15 × 16 = 120 J.
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Q5. A 10 N force is applied to move an object 3 m. What is the work done if the force is applied at an angle of 60 degrees to the direction of motion?
Solution:
Work done = Force × Distance × cos(θ) = 10 N × 3 m × cos(60°) = 10 N × 3 m × 0.5 = 15 J
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Q6. A 3 kg object is pushed with a force of 12 N over a distance of 4 m. What is the work done on the object?
Solution:
Work done (W) = Force (F) × Distance (d) = 12 N × 4 m = 48 J.
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Q7. A car does 5000 J of work in moving a distance of 100 m. What is the average force exerted by the car? (2023)
Solution:
Average Force = Work done / Distance = 5000 J / 100 m = 50 N
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Q8. What is the work done when a force of 15 N moves an object 3 m at an angle of 60° to the direction of the force?
Solution:
W = F × d × cos(θ) = 15 N × 3 m × cos(60°) = 15 × 3 × 0.5 = 22.5 J.
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Q9. A force of 50 N is applied to move an object 4 m. How much work is done?
Solution:
Work = Force * Distance = 50 N * 4 m = 200 J.
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Q10. A 2 kg object is pushed with a force of 10 N over a distance of 5 m. What is the work done on the object?
Solution:
Work done = Force * Distance = 10 N * 5 m = 50 J.
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