Mass and Weight

Which statement about the masses and weights of objects on the Earth is correct?

The table shows the weight in newtons of a10 kg mass on each of four planets.

\[
\begin{array}{|c|c|}
\hline \text { planet } & \text { weight of a } 10 \mathrm{~kg} \text { mass/N } \\
\hline \text { Earth } & 100 \\
\text { Jupiter } & 250 \\
\text { Mercury } & 40 \\
\text { Venus } & 90 \\
\hline
\end{array}
\]

The diagram shows a force meter (spring balance) being used.

On which planet is the force meter (spring balance) being used?

Which property of a body can be measured in newtons?

A cup contains hot liquid. Some of the liquid evaporates as it cools. What happens to the mass and to the weight of the liquid in the cup as it cools?

\[
\begin{array}{|c|c|c|}
\hline & \text { mass } & \text { weight } \\
\hline \text { A } & \text { decreases } & \text { decreases } \\
\text { B } & \text { decreases } & \text { stays the same } \\
\text { C } & \text { stays the same } & \text { decreases } \\
\text { D } & \text { stays the same } & \text { stays the same } \\
\hline
\end{array}
\]

Two blocks of metal \(X\) and \(Y\) hang from spring balances as shown in the diagram.

What does the diagram show about \(X\) and \(Y\) ?

The graph shows how weight varies with mass on planet \(\mathrm{P}\) and on planet \(\mathrm{Q}\).

An object weighs \(400 \mathrm{~N}\) on planet \(\mathrm{P}\). The object is taken to planet \(\mathrm{Q}\).
Which row is correct?

\[
\begin{array}{|c|c|c|}
\hline & \begin{array}{c}
\text { mass of object } \\
\text { on planet Q/kg }
\end{array} & \begin{array}{c}
\text { weight of object } \\
\text { on planet Q/N }
\end{array} \\
\hline \text { A } & 40 & 200 \\
\text { B } & 40 & 400 \\
\text { C } & 80 & 200 \\
\text { D } & 80 & 400 \\
\hline
\end{array}
\]

Which statement about mass and weight is correct?

A metal block is heated until it is completely melted. It is then allowed to solidify. What happens to the mass of the metal during the changes of state?

\[
\begin{array}{|c|c|c|}
\hline & \begin{array}{c}
\text { mass during } \\
\text { melting }
\end{array} & \begin{array}{c}
\text { mass during } \\
\text { solidification }
\end{array} \\
\hline \text { A } & \text { decreases } & \text { increases } \\
\text { B } & \text { increases } & \text { decreases } \\
\text { C } & \text { increases } & \text { stays constant } \\
\text { D } & \text { stays constant } & \text { stays constant } \\
\hline
\end{array}
\]

Which statement about the mass and the weight of an object is correct?

An object always has mass but does not always have weight. What must be present and acting on the mass for it to have weight?