Forces

Question 1

Force

Answer 1

A push or pull one body exerts on another

Question 2

Newton’s First Law

Answer 2

An object moving at a constant velocity stays moving at that velocity. An object at rest stays at rest unless acted upon by a force.

Question 3

Inertia

Answer 3

The tendency of an object to resist any change in motion

Question 4

Net Force

Answer 4

A combination of all forces that act upon an object

Question 5

Gravity

Answer 5

Every object exerts a force on every other object. This force is gravity. It is a pull.

Question 6

Mass

Answer 6

The amount of matter, or “stuff” an object has. It is measured in kilograms.

Question 7

Weight

Answer 7

The measure of a force of gravity on your mass; how hard an object is pulled toward the center of the Earth.

Question 8

Newton’s Second Law of Motion

Answer 8

The net force acting on an object causes the object to accelerate in relation to the size of the force and the mass of the object.

Question 9

Friction

Answer 9

A force that opposes motion between two surfaces that are touching each other

Question 10

Static Friction

Answer 10

Friction that resists getting an object moving (this happens when objects aren’t moving)

Question 11

Kinetic Friction

Answer 11

Sliding Friction, Rolling Friction

Friction that resists keeping an object moving (this happens when an object is moving)

Question 12

Newton’s Third Law of Motion

Answer 12

To every action there is an equal (in size) and opposite (in direction) reaction force.

Question 13

Projectile

Answer 13

Anything that is thrown or shot through the air

Question 14

Cenripetal Force

Answer 14

Force acting toward the center of a curved or circular path

Question 15

Momentum

Answer 15

Mass on the move! The force required to stop a moving object.