* Acts vertically downwards due to the Earth's gravity.

* Pulls the pram and its occupants downwards.

2. Frictional force

* Acts in the opposite direction to the motion of the pram.

* Caused by the contact between the pram wheels and the ground.

* Impedes the pram's motion.

3. Muscular force

* Applied by the person pushing the pram.

* Acts in the forward direction.

* Propels the pram forward.

4. Air resistance

* Acts in the opposite direction to the motion of the pram.

* Caused by the air molecules colliding with the pram.

* Impedes the pram's motion.

5. Centripetal force

* Acts towards the centre of a curved path.

* When the pram is moving along a curved path, the centripetal force is necessary to keep it in that path.