GEM UNIT TEST

1. Which of the following choices best represents force?

• a push or a pull always causing motion
• a push or a pull always causing acceleration
• a push or a pull acting without an object
• a push or a pull acting on an object

2. Which of these is true?

• Though all matter has mass, small amounts of mass are unaffected by gravity
• All matter has mass; all mass is affected by gravity
• Only the Earth's gravity affects matter
• Only the Earth's and sun's gravity affect matter

3. As the distance between two objects increases, the force of gravity between them

• decrease
• does not change
• increases only slightly
• increases greatly

4. The gravitational pull is greater between two objects that

• have greater masses
• have rougher surfaces
• are further apart
• are moving at greater speed

5. The law of universal gravitation says that gravitational force is

• related to mass and distance
• related to weight and distance
• related to mass and friction
• related to weight and friction

6. What are the tiny particles that make up matter?

• charges
• atoms
• electricity
• forces

7. Which part of the atom has a negative charge?

• protons
• electrons
• neutrons
• nucleus

8. What happens when electrons move from one object to another by direct contact?

• friction
• detection
• induction
• conduction

9. If a material does not allow charges to move through it easily, what is it called?

• electrical insulator
• electrical conductor
• static electricity
• electric discharge

10. What is the loss of static electricity as charges move off an object?

• static
• electric discharge
• friction
• induction