Unit 3 - Grade 8 - West/Stabler/Fasano

What two factors affect gravitational pull?

• mass and force

• acceleration and mass

• mass and distance

• distance and force

When will the forces of gravity between two objects be the GREATEST?

• when the masses of both objects are small and the objects are far apart

• when the masses of both objects are large and the objects are close together

• when the masses of both objects are small and the objects are close together

• when the masses of both objects are large and the objects are far apart

Which statement about gravity is true?

• gravity causes objects to pull towards one another

• gravity only takes place between planets

• gravity causes objects to push away from each other

• the moon doesn't have any gravity

Which planet could I jump higher on? Jupiter (larger mass) or Earth (smaller mass)

• Jupiter

• Earth

Which of the TWO below result in an attractive force?

• a positive charge and a negative charge

• two south poles

• two positive charges

• two negative charges

• A north pole and a south pole

Static electricity is the buildup of charges between two objects. What best explains why a balloon is attracted to hair when the two have been rubbed together?

• The balloon and hair both have positive charges

• The balloon and the hair both have neutral charges

• The balloon and the hair both have negative charges

• The balloon and the hair both have opposite charges

To decrease the strength of a magnetic field around an electromagnet, we must

• increase the number of coils

• decrease the size of the iron core

• increase the size of the iron core

• decrease the number of coils

Newton's first law is known as the law of...

• Friction

• Mass

• Inertia

• Gravity

What kind(s) of objects have inertia?

• all objects with mass

• only objects in motion

• only objects at rest

• only objects whose motion is being changed

Which type of force(s) will cause a change in an object's motion?

• gravity

• balanced forces

• zero net force

• unbalanced forces