grade 6, con 5, lesson 5&6

To make clothes, we can use.............

• steel.

• concrete.

• rocks.

• flexible fabric.

Plastic.............

• is a liquid material.

• burns easily.

• is originated from petroleum.

• is a gaseous material.

To make bridges we can use...........

• flexible fabric.

• concrete.

• smart clothes.

• glass.

Concrete..........

• becomes liquid after it dries.

• consists of rock, sand and water.

• controls your body temperature.

• is originated from petroleum.

All the following are properties of petroleum, except........

• it is a liquid material.

• it often resists burning.

• it burns easily.

• it is the original material of plastic.

Due to the friction force between a moving object and a flat road, the speed of a moving object............

• decreases then increases.

• not be affected.

• decreases.

• increases.

If there are a small car and a truck moving down on the same ramp, ....

• the car moves faster than the truck.

• the car and the truck move with the same speed.

• the truck moves slower than the car.

• the truck moves faster than the car.

If the mass of an object moves down on a ramp............ its speed...........

• decreases - increases.

• increases - decreases.

• increases - increases.

• does not change - decreases.

When a marble goes down on a ramp, its stored potential energy........

• increases.

• doesn't change.

• changes into kinetic energy.

• changes into light energy.

Due to the friction Force thermal energy of a moving object changes into kinetic energy

• True

• False