An object of mass 2 kg is suspended from a spring balance that is inside a lift travelling downwards.

If the reading on the spring balance is 30 N, the acceleration of the lift is

1. upwards.
2. downwards.
3. downwards.
4. upwards.
5. downwards.

A lift accelerates from rest at a constant rate until it reaches a speed of 3 ms⁻¹. It continues at this speed for 10 seconds and then decelerates at a constant rate before coming to rest. The total travel time for the lift is 30 seconds.

The total distance, in metres, travelled by the lift is

1.  30
2.  45
3.  60
4.  75
5.  90

A 5 kg parcel is on the floor of a lift that is accelerating downwards at 3 m/s².

The reaction, in newtons, of the floor of the lift on the parcel is

A. 

B.   

C. 

D. 

E.   

A person of mass kg carrying a bag of mass kg is standing in a lift that is accelerating downwards at  .

The force of the lift floor acting on the person has magnitude

A.   

B.   

C.   

D.   

E.   

A 20 kg parcel sits on the floor of a lift.

1. The lift is accelerating upwards at 1.2 ms¯².

    

   Find the reaction force of the lift floor on the parcel in newtons.  (2 marks)

2. Find the acceleration of the lift downwards in ms¯² so that the reaction of the lift floor on the parcel is 166 N.  (2 marks)

An 80 kg person stands in an elevator that is accelerating downwards at .

The reaction force of the elevator floor on the person, in newtons, is

A.   688

B.   704

C.   784

D.   880

E.   896