Latihan Daya paduan

Latihan lif

Satu bakul yang diisikan buah-buahan berjisim 6.5 kg digantungkan dengan neraca yang terikat kepada siling di dalam lif. Berapakah bacaan neraca itu, jik lif itu

a) Dalam keadaan pegun?b) Bergerak ke atas dengan pecutan 2.0 ms-2

c) Bergerak ke bawah dengan pecutan 3.5 ms-1

Latihan takal

Kira tegangan tali bagi soalan di bawah.

Figure shows an object of mass is placed on a table.

Calculate

(a) the weight of the object

(b) the normal reaction which is acting upwards from the table to the

Figure shows two weights of mass 2 kg and 6 kg are joined by a length of rope passes over a smooth pulley.

If the system is released from rest, what is the

(a) tension of the rope

(b) acceleration of the weights?

Figure shows a trolley of mass 2 kg is placed on the surface of a table.

What is the acceleration of the trolley and the tension of the rope when the 3- kg weight is released if the surface of the table is

(a) smooth

(b) rough and has the frictional force 4 N.

A student of mass 50 kg stands on a weighing scale in a lift. What is the reading of the weighing scale if the lift

(a) at rest

(b) moving up with an uniform velocity 20 ms-1

(c) moving up with an acceleration 4 ms-2

(d) moving up with a deceleration 2 ms-2

(e) moving down with an uniform velocity 30 ms-1

(f) moving down an acceleration 5 ms-2

(g) moving down with a deceleration 3 ms-2

(h) is free falling