Gravity and Newton's Laws

Newton's First Law of Motion is also called the Law of _____________.

• motion
• gravity
• inertia
• momentum

Which statement is true?

• Only objects in motion have inertia
• Only objects at rest have inertia
• All objects whether they are in motion or motionless have inertia
• All objects have inertia, but motionless objects have more

What effects an object's inertia?

• the object's volume
• the object's mass
• the object's density
• the object's distance from other objects

What is Newton's Second Law of Motion?

• The Law of Inertia
• For every action there is an equal but opposite reaction
• force x gravity = acceleration
• force = mass x acceleration

If action and reaction forces cancel each other out, the net force is

• zero and there is no change in motion
• greater than zero and there is no change in motion
• the net force is zero and there is a change in motion
• greater than zero and there is a change in motion

If action and reaction forces do not cancel each other out, 

• then the object will not move because the forces are not equal
• then the object will move because the forces are not equal
• then the object will not move because the forces are equal
• then the object will  move because the forces are equal

What force is always acting against motion?

• the force of gravity
• the electromagnetic force
• the strong force
• the friction force

How is mass different from weight?

• weight can change because it depends on the force of gravity, mass does not
• mass is measured in grams; weight is a force, it is measured in newtons
• both A and B
• mass and weight are the same thing!

What two factors effect the force of gravity?

• weight and mass
• speed and distance
• weight and speed
• mass and distance

gravitational forces decrease as distance increases

• true
• false