Understanding Force Diagrams Quiz

Which of the following best describes Newton’s First Law of Motion?

• The acceleration of an object is directly proportional to the net force acting on it.

• An object will remain at rest or in uniform motion in a straight line unless acted upon by a net external force.

• For every action, there is an equal and opposite reaction.

• The force of gravity acts on all objects equally.

A 5 kg box is at rest on a horizontal surface. Which of the following force diagrams correctly represents the forces acting on the box?

• Only a downward arrow labelled “Weight”.

• An upward arrow labelled “Normal force” and a downward arrow labelled “Weight”, both of equal length.

• An upward arrow labelled “Weight” and a downward arrow labelled “Normal force”.

• Only an upward arrow labelled “Normal force”.

Which of the following is NOT a contact force?

• Friction

• Tension

• Gravitational force

• Normal force

A car is moving at a constant velocity on a straight, level road. What can be said about the resultant force acting on the car?

• The resultant force is upwards.

• The resultant force is downwards.

• The resultant force is zero.

• The resultant force is forwards.

Which of the following statements about free body diagrams is correct?

• All forces acting on the object are drawn from the centre of mass.

• Only the forces the object exerts on other objects are shown.

• Only gravitational forces are shown.

• Forces are drawn as curved arrows.

Which of the following is an example of Newton’s Third Law?

• A book resting on a table.

• A swimmer pushing off the wall and moving in the opposite direction.

• A ball rolling down a hill.

• A car accelerating due to the engine force.

Which of the following is NOT required when drawing a free body diagram?

• The object represented as a dot or box.

• All forces acting on the object.

• The direction and relative magnitude of each force.

• The velocity of the object.