grade 4 , con 6 , lesson 4

A very big truck needs ........to move.

• very small engine

• small engine

• very big engine

• no engine

As the force that acts on an object increases, its ability to do work..........

• increases.

• decreases.

• doesn't changed.

• destroyed.

The amount of fuel that is used in a big truck to produce a certain amount of kinetic energy is............... the amount of fuel in a small car to get the same amount of kinetic energy.

• less than

• equal to

• more than

• half to

On a flat road, if a large truck is traveling at the same speed of a small car, then the truck has............

• more kinetic energy.

• less kinetic energy.

• the same kinetic energy of the car.

• no kinetic energy at all.

When a car stops, all the following become zero, except............

• speed.

• kinetic energy.

• mass.

• work.

When a moving car decreases its speed then stops, so................

• its kinetic energy becomes zero.

• its light energy only becomes zero.

• its light energy and thermal energy become zero.

• its kinetic energy becomes equal to its thermal energy.

If two objects collide with each other, the energy after collision is............the energy before collision.

• triple

• double

• half

• equal to

When two balls are pushed away at the left side of Newton's cradle, this happens as a result of collision of ...............from the right side.

• one ball

• two balls

• three balls

• four balls

When you throw a ball of clay strongly at a wall, there is..........

• no damage occurs to the ball.

• more damage occurs to the ball.

• energy is destroyed.

• energy is created.

At the same speed, a large mass object has.......... than that of a small mass object.

• less potential energy

• more potential energy

• less kinetic energy

• more kinetic energy