Newton's First Law

• Newton's First Law

  Motion will not change unless an unbalanced or net force acts on it.
• Unbalanced Force

  Net force.

  Can make an object at rest move.
• Balanced Forces

  Equal forces cancelling out.

  This makes an object move at a constant speed or stay stationary.
• The greater the mass, the greater the inertia.
• The less mass, the less inertia.
• When a car collides into an obstacle, it stops instantly. Due to the passengers' inertia they will continue to move forward until they're stopped by the seatbelt, steering wheel or windshield.
• Newton's First Law in action

  
• Newton's First Law is also the law of inertia.
• Inertia

  The tendency to resist change.
• Would the tablecloth trick work better with paper dishes?

  No, it would be more difficult. The paper dishes have less mass and therefore, less inertia.