1.1. Fig. 1.1 shows a man pulling a child on a sledge. 

The mass of the child and the sledge is 42 kg. 

The unbalanced force acting on the sledge is 46 N.

State the magnitude of the force that needs to be exerted by the man to make the sledge move.

1.2. Name the force that is opposing the motion of the sledge.

1.3. Extended tier only

The sledge is then placed at the top of a hill and accelerates down the hill at 0.75 m/s² .

Calculate the resultant force acting on the sledge.

1.4. Assuming that the force opposing the motion of the sledge is the same, calculate the total force acting down the hill.

You may draw a diagram in your answer.