Chapter 11 Forces

Question 1

Inertia

Answer 1

an object at rest stays at rest and if the object is moving it keeps moving at a constant velocity

Question 2

Newton’s 1st law of motion

Answer 2

Matter withstands changes in motion. An object won’t move unless a force is put on it.

Question 3

Newton’s 2nd law of motion

Answer 3

Explains what happens when an unbalanced force on an object’s motion

Question 4

Free fall

Answer 4

Motion of a body and the only force acting on the body is gravity.

Question 5

Terminal velocity

Answer 5

A falling object’s constant velocity when air resistance’s force is equal in magnitude and gravity is the force opposite in direction.

Question 6

Projectile motion

Answer 6

Curved path an object follows when thrown near earth’s surface

Question 7

Law of universal gravitation

Answer 7

In the universe all of the objects are attracted to each other through gravitational force.

Question 8

Weight

Answer 8

Amount of gravity’s force on an object

Question 9

Apparent weightlessness

Answer 9

Astronauts flat in space because them and their surroundings are accelerating at the same rate. So the floor in the shuttle doesn’t push up on them.

Question 10

Newton’s 3rd law of motion

Answer 10

Every action force there’s an opposite reaction force and equal reaction force.

Question 11

Action force

Answer 11

The force put on an object

Question 12

Reaction force

Answer 12

Force that object is pushing back on a force pushing on it