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CAIE A-Level Physics AS 3.1.2 F Ma and Solve Problems Using It Understanding That Acceleration and Questions

Use Newton’s laws to relate resultant force, mass and acceleration in the analysis of motion.

Syllabus
2028–2030
Course
Physics 9702
Level
AS

Exam points

  • Use Newton’s laws to relate resultant force, mass and acceleration in the analysis of motion.

CAIE A-Level Physics AS 3.1.2 F Ma and Solve Problems Using It Understanding That Acceleration and Questions question 1

[Maximum number: 4]

A child on a sledge slides down a steep hill and then travels in a straight line up an ice-covered slope, as illustrated in Fig. 3.1.

Fig. 3.1 (not to scale)

Fig. 3.1 (not to scale)

The sledge passes point A with speed 18 ms−118 \mathrm{~ms}^{-1} at time t=0 and then comes to rest at point B. The child applies a brake to the sledge at point B. The brake does not keep the sledge stationary and it immediately slides back down the slope towards A .

The variation with time t of the velocity v of the sledge from t=0 to t=24 st=24 \mathrm{~s} is shown in Fig. 3.2.

Fig. 3.2

Fig. 3.2

Question (a)

(a)

The child and sledge have a total mass of 70 kg . The component of the total weight of the child and sledge that acts down the slope is 80 N .

Determine

[ 4 ]

Question (i)

(i)

the frictional force on the sledge as it moves from B towards A,

frictional force =
[ 2 ]

Question (ii)

(ii)

the angle θ\theta of the slope to the horizontal.

θ=\theta=
[ 2 ]
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