Understanding Force 1

Which property of an object cannot be changed by a force?

The object in the diagram is acted upon by the two forces shown.

What is the effect of these forces?

Which statement about a moving object is correct?

A force acts on a moving rubber ball.
Which of these changes could not happen to the ball because of the force?

Which combination of forces produces a resultant force acting towards the right?

On which ball is a non-zero resultant force acting?

A large parcel is on a horizontal conveyor belt. The conveyor belt moves the parcel towards a lorry.

The parcel travels towards the lorry at a constant speed. Only two horizontal forces act on the parcel: air resistance, and friction with the conveyor belt.
Which row correctly compares the directions and the sizes of these two forces?

\[
\begin{array}{|c|c|c|}
\hline & \text { directions } & \text { sizes } \\
\hline \text { A } & \text { opposite } & \text { different } \\
\text { B } & \text { opposite } & \text { the same } \\
\text { C } & \text { the same } & \text { different } \\
\text { D } & \text { the same } & \text { the same } \\
\hline
\end{array}
\]

A car moves along a level road.

The diagram shows all of the horizontal forces acting on the car. Which statement is correct?

A moving train is more difficult to stop than a moving car because

Which of the following statements are correct about inertia or Newton’s First Law?