forces

Gravity is the force that _______ objects towards the center of the Earth.

Which TWO forces are seen in the graphic?

• Friction

• Gravity

• energy

• push

• pull

Balanced forces are _____________ and have no motion.

A student designs an experiment to test the effect of the width of a piece of elastic on the elastic's ability to stretch. The student selects four pieces of elastic with different widths but the same length. The student then attaches blocks with different masses to the pieces of elastic. The results of the student's experiment are shown below. What should the student do to improve this experiment?

• Use blocks of equal mass on the four pieces of elastic

• Use blocks with enough mass to cause the four pieces of elastic to break

• Use more than four pieces of elastic and four blocks

• Use four pieces of elastic with different lengths but the same width

What is the force that causes objects to fall to Earth?

• Friction

• Gravity

• Magnetism

• Pressure

The force that pulls objects toward the center of the earth is called what?

• force

• friction

• gravity

• motion

Which type of force will be between the man's hands and the rope?

• push

• pull

• friction

• gravity

A student observes that the craters on the moon are different sizes. The student designs an experiment to study the formation of craters. The materials for the experiment are marbles and a pan of flour. The student makes a hypothesis that the size of the craters made on the surface of the flour will depend on the height from which the marble is dropped. Some of the steps in the student's experiment are described below. Which of these is most likely Step 3 in the student's experiment?

• Drop the same marble from different heights into the pan of flour

• Drop the marbles of different masses from the same height into the pan of flour

• Drop marbles of different sizes from different heights into the pan of flour

• Drop a single marble one time into the pan of flour

An unbalanced force is when objects move in one direction because the force is greater from that direction.

• true
• false

What force is greatest on a compass?

• push

• direction

• north

• magnetism