Understanding Force 1

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

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?

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

What is the effect of these forces?

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

A car moves along a level road.

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

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

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