Chapter 11 - Forces

Question 1

Inertia

Answer 1

An object continues to move in a certain direction unless acted on by an outside force.

Question 2

Newton’s First Law of Motion

Answer 2

Matter resists any change in motion.

Question 3

Newton’s Second Law of Motion.

Answer 3

Describes the effect of an unbalanced force on the motion of an object.

Question 4

Free Fall

Answer 4

The motion of a body when only the force of gravity is acting on it.

Question 5

Terminal Velocity

Answer 5

The constant velocity of a falling object when air resistance is equal to the force of gravity.

Question 6

Projectile Motion

Answer 6

The curved path an object takes when it is in some way projected near Earth’s surface.

Question 7

Law of Universal Gravitation

Answer 7

All objects in the universe attract each other through gravitational force.

Question 8

Weight

Answer 8

The force of an object due to gravity.

Question 9

Apparent Weightlessness

Answer 9

An object and all its surroundings accelerate at the same rate which makes an object appear to float.

Question 10

Newton’s Third Law of Motion

Answer 10

All forces act in pairs. When one force is exerted, another equal force occurs in the opposite direction.

Question 11

Action Force

Answer 11

The force exerted on an object.

Question 12

Reaction Force

Answer 12

The force that the object exerts back.