Students are using two trolleys, Trolley
Before the collision, Trolley
Determine, using calculations, whether the collision is elastic or inelastic. Show your working and justify your answer. (3 marks)
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Students are using two trolleys, Trolley
Before the collision, Trolley
Determine, using calculations, whether the collision is elastic or inelastic. Show your working and justify your answer. (3 marks)
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By the conservation of momentum:
For the collision to be elastic, the kinetic energy must be conserved.
→ As the kinetic energy of the system decreases after the collision, the collision is inelastic.
By the conservation of momentum:
For the collision to be elastic, the kinetic energy must be conserved.
→ As the kinetic energy of the system decreases after the collision, the collision is inelastic.
Jacinda designs a computer simulation program as part of her practical investigation into the physics of vehicle collisions. She simulates colliding a car of mass 1200 kg, moving at 10 ms
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a.
b. The collision is an inelastic collision as the kinetic energy decreases after the collision.
c.i The average force of
c.ii The average force of
a. Using the Conservation of Momentum:
b. | ||
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→ As the kinetic energy of the system decreases after the collision, the collision is inelastic.
c.i. |
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c.ii. |
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→ The average force of
→ Note: no calculation was required for this question as it is an example of Newton’s third law of motion. Simply stating that the force would be equal in magnitude but opposite in direction earned full marks.
Kym and Kelly are experimenting with trolleys on a ramp inclined at 25°, as shown in Figure 7. They release a trolley with a mass of 2.0 kg from the top of the ramp. The trolley moves down the ramp, through two light gates and onto a horizontal, frictionless surface. Kym and Kelly calculate the acceleration of the trolley to be 3.2 m s
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a.i. See Worked Solutions
a.ii.
b.i.
b.ii. For the collision to be elastic, the kinetic energy must be conserved.
→ As the kinetic energy of the system decreases after the collision, it is not an elastic collision.
a.i. The gravitational force down the slope:
a.ii. | ||
b.i. By the conservation of momentum:
b.ii. For the collision to be elastic, the kinetic energy must be conserved.
→ As the kinetic energy of the system decreases after the collision, it is not an elastic collision.