ساينس 4

1. The roller coaster moves up the hill due to the effect of.

فن العلوم عماد الششتاوي

• balanced force

• sound energy

• kinetic energy

• gravity force

2. When the roller coaster stops , its energy of motion

فن العلوم عماد الششتاوي

• doesn't change

• increases

• decreases

• becomes zero

you do work in all the following situations except............

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• pushing a wooden box for a distance

• throwing a stone for a distance.

• lifting a bag up for a distance.

• pulling a big tree which doesn't move

a flaying air plane in the sky has.........

فن العلوم عماد الششتاوي

• potential energy only

• kinetic energy only

• both potential and kinetic energies

• neither kinetic nor potential energies

you can see all following, except........

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• the light of the sun

• the reflected light of the moon

• the light of the candle.

• the sound of a radio.

what force do you use to kick a ball with your leg?.......

فن العلوم عماد الششتاوي

• pull

• push

• sound

• light

when an object is in motion, this means that its........... changes.

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• color

• shape

• size

• position

which of the following will cause an object to move?.......

فن العلوم عماد الششتاوي

• balanced forces

• unbalanced forces

• sound energy

• light energy

which sentence represents the best example of gravity?

فن العلوم عماد الششتاوي

• a car hits a tree, and its motion stops.

• a wind blows, and a sailboat moves

• a book is pushed, and it moves a cross a table

• a person drops a ball, and it falls to the ground

3. The kinetic energy of a car increases by

فن العلوم عماد الششتاوي

• decreasing its speed.

• increasing its speed.

• keeping its speed without changing

• decreasing the pushing force acts on it