Forces Flashcards
Define force
A force is an action that changes or maintains the motion of a body or object
State three ways force may impact an object
A force may be used to twist or rotate an object.
A force is push or pull on an object.
A force applied to an object may change its shape, size and or motion.
What are the two main categories of forces
Contact and non-contact forces
State four types of contact force
Frictional
Tensional
Spring
Normal
State four types of non contact forces
Electric
Magnetism
Nuclear
Gravitational
Net Force
The net force is defined as is the sum of all the forces acting on an object.
Resultant force
When a system of forces is acting on an object, the difference between the forces is called the Resultant force. For example, a 3N force to the left and 10N force to the right gives a resultant force of 7N to the right.
The resultant force is zero when the object is at rest or it is traveling with the same velocity as the object
Moment of a force
What are Newton’s Three Laws of Motion?
In the first law, an object will not change its motion unless a force acts on it. In the second law, the force on an object is equal to its mass times its acceleration. In the third law, when two objects interact, they apply forces to each other of equal magnitude and opposite direction.
Example of first law
Basically, the law states that an object at rest stays at rest and an object continues its state of motion until an external force acts on it. Here are some examples: One’s body movement to the side when a car makes a sharp turn. Tightening of seat belts in a car when it stops quickly.
Example of second law
A ball develops a certain amount of acceleration after being hit. The acceleration with which the ball moves is directly proportional to the force applied to it. This means that the harder you hit the ball, the faster it will move, thereby demonstrating Newton’s second law of motion in daily life.
Example of Newton’s third law
Newton’s third law states that for every action there is an equal and opposite reaction. As you stand on the ground, your body push on the earth with a force, and the earth reacts on your body with the same force in opposite direction. This is an example of Newton’s third law.
