Forces Vocab

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10y
Net force is the total amount of force enacted on an object. They are playing tug of war, each putting force on the object.
Coefficient of friction is ratio of the weight of the object being moved along a surface and the force that maintains contact between the object and the surface. The ice skater and the ice create a coefficient of friction between them.
Static friction is where there is a force being put on an object but the object does not move. This man is pushing on the building but the building is not moving.
Kinetic friction is when something is pushing on an object and the object is moving. The lawnmower has kinetic friction because the boy is pushing on it and it is moving.
Normal force is the equal force pushing back upon the initial force. Gravity is pushing this laptop down but the table is pushing up on the laptop with an equal force.
Weight is the force exerted on an object by gravity. An elephant weighs a lot, so gravity is putting a good amount of force on it.
Newton's third law states that for every action, there is an equal and opposite reaction. In the picture, the person is lifting 100 pounds. As he lifts the 100 pounds, there is an equal force of 100 pounds working against him.
Newton's second law states that the acceleration of an object depends on both force and mass. Increasing force will increase acceleration and increasing mass will decrease acceleration. The man pushing his car in this picture has to find the amount of force it takes to push, taking into account the mass of the car.
Inertia is the resistance of an object to change its state of motion, including speed and direction. In this picture, a Mythbuster is pulling the tablecloth from under the dishes on it. The dishes have a tendency to remain where they are if the friction from the tablecloth isn't too great.
Newton's 1st law (object at rest) states than an object at rest will stay at rest unless it is acted upon by an unbalanced force. The apple is still in the picture and does not move because there is no unbalanced force acting upon it.
Newton's first law (objects in motion) is also called the law of inertia. It states that an object in motion will stay in motion with the same direction and speed unless acted upon by an unbalanced force. The picture shows a baseball in motion being acted upon by a baseball bat (the unbalanced force) which then changes the direction and speed of the object.
A force is something that causes a change in the object's motion. This person is trying to push a boulder up the hill, putting force on the boulder. Force is measured in Newtons (N).