G6 Forces End of unit quiz

A force acting on an object does no work if

• a machine is used to move the object.

• the force is not in the direction of the object’s motion.

• the force is greater than the force of friction.

• the object accelerates.

What is the speed of a bobsled whose distance time graph indicates that it traveled 100 m in 25 seconds?

• 4m/s

• 0.25m/s

• 250m/s

• 100m/s

The force that one surface exerts on another when the two rub against each other is called

• gravity

• inertia

• friction

• acceleration

Which of the following would become difficult if there was no frictional force

• moving a heavy box from one place to another.

• playing billiards

• the movement of a door.

• walking on a wet marble floor

What is transferred by a force moving an object through a distance?

• motion

• energy

• force

• mass

Speed is the ratio of the distance an object moves to____

• the displacement of the object.

• the motion of the object.

• the amount of time needed to travel the distance.

• the direction the object moves.

When a pair of balanced forces acts on an object, the net force that results is:

• greater in size than one of the forces.

• equal to zero.

• equal in size to one of the forces.

• greater in size than both forces combined

Which of the following materials will sink in water? (The density of water 1.00 g/cm3.)

• cooking oil (0.82 g/cm3)

• balsa wood (0.12 g/cm3)

• ethanol (0.798 g/cm3)

• steel (7.18 g/cm3)

The upward force acting on an object submerged in a fluid is called:

• drag

• weight

• pressure

• upthrust

If a bicyclist travels 30 kilometers in two hours, her average speed is ____.

• 60Km/h

• 2Km/h

• 30Km/h

• 15Km/h