The forces acting on three objects are shown in the diagram.

For each of a, b and c:

Say whether the forces are balanced or unbalanced.

The forces acting on three objects are shown in the diagram.

For each of a, b and c:

If the forces are unbalanced, calculate the resultant force on the object and give its direction.

The forces acting on three objects are shown in the diagram.

For each of a, b and c:

Say how the object's motion will change.

A book is weighed on Earth. It is found to have a mass of $1kg$. So its weight on the Earth is $10\mathrm{N}$. What can you say about its mass and its weight if you take it:

To the Moon, where gravity is weaker than on Earth$?$

A book is weighed on Earth. It is found to have a mass of $1kg$. So its weight on the Earth is $10\mathrm{N}$. What can you say about its mass and its weight if you take it:

To Jupiter, where gravity is stronger$?$

An astronaut has a mass of $90kg$.

Calculate her weight on the surface of the Earth.

An astronaut has a mass of $90kg$.

The astronaut travels to Mars, where gravity is weaker. The acceleration of free fall on the surface of Mars has a value $g=3.7m/s^2$. Calculate her weight on Mars.

Look at the speed-time graph of figure. Find a point where the graph is sloping upwards.

Is the parachutist accelerating or decelerating$?$

Look at the speed-time graph of figure. Find a point where the graph is sloping upwards.

Which of the two forces acting on the parachutist is greater$?$