MEDIUM
AS and A Level
IMPORTANT
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An elevator is carrying a woman of mass 55 kg upwards. It is travelling upwards at 8 m s-1 and starts to slow down at a constant rate when it is 9 m from where it stops. Find the size of the normal contact force on the woman.

Important Questions on Force and Motion in One Dimension

MEDIUM
AS and A Level
IMPORTANT
Cambridge International AS & A Level Mathematics : Mechanics Course Book>Chapter 2 - Force and Motion in One Dimension>EXERCISE 2D>Q 3
An elevator is carrying a trolley of mass 30 kg downwards, accelerating at a constant rate from rest to 7 m s-1 in 2 s. Find the size of the normal contact force on the trolley.
MEDIUM
AS and A Level
IMPORTANT
Cambridge International AS & A Level Mathematics : Mechanics Course Book>Chapter 2 - Force and Motion in One Dimension>EXERCISE 2D>Q 4
An elevator is carrying a child of mass 40 kg downwards. It is travelling at 8 m s-1 and starts to slow down at constant acceleration when it is 6.25 m from where it stops. Find the size of the normal contact force on the child.
MEDIUM
AS and A Level
IMPORTANT
Cambridge International AS & A Level Mathematics : Mechanics Course Book>Chapter 2 - Force and Motion in One Dimension>EXERCISE 2D>Q 5

A forklift truck carries a wooden pallet. On the pallet is a box of tiles with mass 35 kg. The truck lifts the pallet and tiles with an initial acceleration of 2 m s-2. Find the normal contact force on the tiles.

Question Image

HARD
AS and A Level
IMPORTANT
Cambridge International AS & A Level Mathematics : Mechanics Course Book>Chapter 2 - Force and Motion in One Dimension>EXERCISE 2D>Q 6
A weightlifter is trying to lift a bar with mass 200 kg from the floor. He lifts with a force of 1800 N but cannot lift it off the floor. Find the size of the normal contact force from the floor on the bar while the weightlifter is trying to lift the bar.
HARD
AS and A Level
IMPORTANT
Cambridge International AS & A Level Mathematics : Mechanics Course Book>Chapter 2 - Force and Motion in One Dimension>EXERCISE 2D>Q 7
A plate of mass 0.7 kg is being held on a horizontal tray. The tray is lifted from rest on the floor and accelerates at a constant rate until it reaches a height of 1.25 m after 5 s. Find the normal contact force on the plate.
HARD
AS and A Level
IMPORTANT
Cambridge International AS & A Level Mathematics : Mechanics Course Book>Chapter 2 - Force and Motion in One Dimension>EXERCISE 2D>Q 8
A man of mass 75 kg is standing in the basket of a hot-air balloon. The balloon is rising at 5 m s-1 and 4 s later it is descending at 3 ms-1. Assuming constant acceleration, find the normal contact force on the man.
HARD
AS and A Level
IMPORTANT
Cambridge International AS & A Level Mathematics : Mechanics Course Book>Chapter 2 - Force and Motion in One Dimension>EXERCISE 2D>Q 9

A girl of mass 45 kg is sitting in a helicopter. The helicopter rises vertically with constant acceleration from rest to a speed of 40 m s-1 when it reaches a height of 200 m.

Find the normal contact force on the girl.

EASY
AS and A Level
IMPORTANT
Cambridge International AS & A Level Mathematics : Mechanics Course Book>Chapter 2 - Force and Motion in One Dimension>EXERCISE 2D>Q 9

A girl of mass 45 kg is sitting in a helicopter. The helicopter rises vertically with constant acceleration from rest to a speed of 40 m s-1 when it reaches a height of 200 m.

What assumptions have been made to answer the question?