Science 6 Third Quarter Examination

Which of the following helps in reducing friction?

• cloth, clay, rubber

• gravel, sand, soil

• pebbles, rocks, mud

• lubricants, rollers, wheels, and bearings

A boy is playing with a skateboard. In which surface will it travel the fastest?

• the carpet

• the polished floor

• the rough floor

• sandy ground

Two balls were rolled at the same time on different surfaces with same force. Ball A rolls slowly on a rough surface and then eventually stopped while Ball B rolls on a smooth surface rolled faster until it reached another object then slowly stopped. What do the statements imply?

• The balls have same speed even if the surface differ.

• Smooth surfaces produce less friction than rough surfaces.

• Smooth surfaces produce more friction than rough surfaces.

• The surface of an object has no effect on the movement of object.

Which of the following is true about friction?

I. Friction is not present in a smooth surface

II. Friction slows down a moving object

III. Smooth surface has more friction

IV. Objects move slowly on a rough surface

• I, II

• II, III

• I, III

• I, II, IV

You have noticed that your door hinges create a squeaky sound and hard to open. After applying some lubricants on it, the squeaky sound disappeared and made it easy to be opened. How do lubricants affect friction?

• Lubricants decrease friction and causes objects to move faster.

• Lubricants has no effect on the movement of objects.

• Lubricants increase friction and causes objects to move faster.

• Lubricants slows down the movement of objects.

You rolled a marble on a very smooth surface. Without friction, what might happen to the marble?

• It will stop immediately.

• It will maintain its speed and suddenly stop.

• It will move either to the right or left side and stop.

• It will continuously move until it strikes another object.

When you rolled your rubber ball on the grassy surface of the ground, it suddenly stops. How does friction affect the motion of the ball?

• Friction affects the ability of the ball to take more rolling.

• Friction decreases the time of the ball to take farther distance.

• Friction opposes the direction of the ball to change its direction.

• Friction slows down the rolling of the ball and prevents the ball to move farther.

A boy who weighs 35 kilos jumps higher than another boy who weighs 50 kilograms. Howvdoes gravity affect the jumps?

• The heavier the object, the lesser gravity.

• The lighter the object, the lesser gravity.

• The stronger the gravity, the higher the jump.

• Gravity does not affect how high one can jump.

Why is it easy to slip when there is water on a smooth surface?

• The friction between your feet and the floor has no effect on your movement.

• The friction between your feet and the floor is increased by the water.

• The water increases the friction between your feet and the floor.

• The water is a lubricant and reduces the friction between your feet and the floor.

A car and a truck are climbing the slope of a hill. Which of the two vehicles will reach the top faster? Why?

• The car because it has smaller engine than the truck.

• The truck because it has bigger fuel tank than the car.

• The car because it is smaller and lighter than the truck and has lesser gravity.

• The truck because it is bigger and heavier than the car and has more gravity.