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IB DP Physics Questions

2.3 Work, Energy & Power

Question 1

A force of 10 N is applied to move a box 5 meters in the direction of the force. How much work is done on the box?

A. 2 J

B. 10 J

C. 50 J

D. 100 J

Question 2

Which of the following is a scalar quantity?

A. Force

B. Velocity

C. Displacement

D. Work

Question 3

A ball of mass 2 kg is raised to a height of 5 meters above the ground. What is its potential energy relative to the ground? (Assume g = 10 m/s^2)

A. 10 J

B. 25 J

C. 50 J

D. 100 J

Question 4

A car of mass 1000 kg is moving with a speed of 20 m/s. What is its kinetic energy?

A. 2 x 10^5 J

B. 2 x 10^4 J

C. 1 x 10^5 J

D. 1 x 10^4 J

Question 5

Which of the following statements about energy conservation is true?

A. Kinetic energy can be converted to potential energy, but not vice versa.

B. Energy can neither be created nor destroyed.

C. Only potential energy is conserved in a closed system.

D. Energy is always lost as heat in any transformation.

Question 6

a) Define the term "work" in the context of physics. How is it calculated? [2]

b) A force of 50 N is applied to a box, causing it to move a distance of 4 m in the direction of the force. Calculate the work done on the box. [2]

Question 7

a) Differentiate between kinetic energy and potential energy, providing an example for each. [3]

b) A 5 kg object is lifted to a height of 10 m above the ground. Calculate its gravitational potential energy. (Assume g = 9.81 m/s^2) [2]

Question 8

a) Define "power" in terms of work and time. [2]

b) If a machine does 600 J of work in 10 seconds, what is its power output? [2]

Question 9

a) Explain the principle of conservation of energy. [2]

b) A 3 kg ball is dropped from a height of 20 m. Calculate its potential energy at the start. [2]

c) Using the conservation of energy principle, determine the kinetic energy of the ball just before it hits the ground. [3]

Question 10

a) Define Newton's second law of motion and explain its relation to work. [3]

b) A force of 10 N acts on a 2 kg object, causing it to accelerate. Calculate the acceleration of the object. [2]

c) If the object moves a distance of 5 m under this force, determine the work done on the object. [2]

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