Force Motion Vocabulary Forcea push or pull Gravity

Force & Motion

Vocabulary ● Force-a push or pull. ● Gravity- the force that attracts a body toward the ● ● center of the earth. Friction- a force that resists motion between two surfaces that are in contact. Drag-a force acting opposite to the relative motion; ex: a type of friction or resistance in water or air. Magnetism- attraction or repulsion that arises between electrically charged particles because of their motion. Thrust-to push forcibly; to drive with force.

Force ● In science, the word force has a simple and specific meaning. ● Force is a push or a pull. ● When one object pushes or pulls another object, you say that the first object exerts a force on the second object.

What do you notice about this picture? Turn and talk to someone next to you about what is happening here. Balanced forces: When two forces of equal magnitude act in opposite directions, they balance each other out.

What do you notice in the picture? Turn and talk to someone next to you about what is happening here. Unbalanced force: Two forces of unequal magnitude acting in opposite directions.

Newton's first law of motion Often stated as: An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force. 6

Newton’s second law of motion Acceleration is produced when a force acts on a mass. The greater the mass (of the object being accelerated) the greater the amount of force needed (to accelerate the object). 8 Translated: Everyone unconsciously knows the Second Law. Everyone knows that heavier objects require more force to move the same distance as lighter objects.

Newton’s third law of motion For every action there is an equal and opposite re-action. Let's study how a rocket works to understand Think about a rocket. The rocket's action is to push down on the ground with the force of its powerful engines, and the reaction is that the ground pushes the rocket upwards with an equal force. 9

Shush & watch! Newton's Laws Brain Pop