grade 4 , con 4

Mona throws her ball up in the air so, gravity will make the ball move..........

• forward.

• upward.

• downward.

• backward.

Which situation represents the best example of gravity?...........

• A car hits a tree and its motion stops.

• A wind blows and a sailboat moves.

• A book is pushed to move across a table.

• A person drops a ball that falls to the ground.

The speed of the Shockwave truck is more than that of the.............

• normal truck only.

• jet airplane only.

• normal truck and rocket.

• rocket and jet airplane.

All the following are examples of pushing force, except............

• writing using a keyboard.

• kicking a ball.

• throwing a basketball.

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.............. used to move an object. transferred by a force that is

• energy

• friction

• pushing

• gravity

Which of the following sentences describes the friction force ?

• It pulls objects toward the ground.

• It pushes objects away from the ground.

• It slows 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.

• gravity pushing force only.

• friction of air and gravity pulling forces.