grade 4 , con 4 , lesson 3&4

All of the following examples can move by a pushing force, except

• a ball.

• a swing.

• tug-of-war rope.

• a car.

To stop a moving object we can apply a......... against it.

• pushing force

• gravity force

• sound energy

• light energy

Samir pushed his toy car that moved forward, to stop it he should.........

• push it in the same moving direction.

• pull it with a small force in the same moving direction.

• pull it with a large force in the same moving direction.

• push it in a direction opposite to its moving direction.

The work done is equal to the amount of........... transferred by a force that is used to move an object.

• energy

• friction

• pushing

• gravity

The force that occurs when an object rubs against another object is called

• friction.

• gravity.

• push.

• pull.

The force that tries to stop an object moving on a surface is called.......

• gravity.

• friction.

• pusn.

• pull.

There is a .......... force between the car tires and the road that acts to decrease car's speed gradually.

• gravity

• pulling

• pushing

• friction

Which of the following sentences describes the friction force?..........

• It pulls objects toward the ground.

• It pushes objects away from the ground.

• It siows down or stops objects in motion.

• It doesn't affect objects in motion.

When an apple falls from a tree down to the ground, it is affected by

• friction force of air only.

• gravity pulling force only.

• friction of air and gravity pulling forces.

• gravity pusning force only.

Tamer pushes a ball on a flat ground and it covers a distance of 30 cm. If he pushes it with more force, it may cover a distance equal to .........cm.

• 5

• 15

• 30

• 50