The graph shows how the force on a body varies with time. Assuming that the body is moving in a straight line, by how much does its momentum change?
Correct answer: C. 20kg ms-1
- A. 40 kg ms-1
- B. 36kg ms-1
- C. 20kg ms-1
- D. 16kg ms-1
Explanation
Explanation is given below: The area under F - t" graph represents changes in momentum, since ∆ P/ ∆ t = Fchange in P= area of triangle + area of trapeziumchange in P = (2 x 2) + 0.5 x (6+2) x (4)= 20 kg ms-1
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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.
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