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3.3. Linear momentum and its conservation
A subsection of Physics, 9702, through 3. Dynamics
Listing 10 of 111 questions
State the principle of conservation of momentum. Two balls, X and Y, move along a horizontal frictionless surface, as shown from above in . X Y A B A B 3.0 kg 4.0 m s–1 3.7 m s–1 4.8 m s–1 2.5 kg θ θ X Y before collision after collision (not to scale) (not to scale) Ball X has a mass of 3.0 kg and a velocity of 4.0 m s–1 in a direction at angle θ to a line AB. Ball Y has a mass of 2.5 kg and a velocity of 4.8 m s–1 in a direction at angle θ to the line AB. The balls collide and stick together. After colliding, the balls have a velocity of 3.7 m s–1 along the line AB on the horizontal surface, as shown in . By considering the components of the momenta along the line AB, calculate θ. θ = ° By calculation of kinetic energies, state and explain whether the collision of the balls is inelastic or perfectly elastic.
9702_s22_qp_22
THEORY
2022
Paper 2, Variant 2
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Questions Discovered
111