IB Physics HL A 2 13 Weight Questions

Calculate weight from mass and local gravitational-field strength, deriving mass from density when needed and resolving weight along an inclined plane.

Exam points

Calculate weight using W = mg and the local value of g, finding mass from density and cube dimensions.
Resolve the component of weight down a slope as mg sin θ, using the angle to the horizontal.

[Maximum number: 1]

A girl rides a bicycle that is powered by an electric motor. A battery transfers energy to the electric motor. The emf of the battery is 16 V and it can deliver a charge of 43 kC when discharging completely from a full charge.

The bicycle and the girl have a total mass of 66 kg . The girl rides up a slope that is at an angle of $3.0^{\circ}$ to the horizontal.

Figure for Question IB Physics HL A 2 13 Weight Questions question 1 — IB Physics HL

Calculate the component of weight for the bicycle and girl acting down the slope.

$66 \mathrm{~g} \sin \left(3^{\circ}\right)=34$ « N »

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IB Physics HL A 2 13 Weight Questions question 1