Forces.

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Presentation transcript:

Forces

Forces Force: A push or a pull on an object. A force can effect an object by: Causing a resting object to move Accelerating a moving object by changing its speed or direction

Forces Force is measured in Newtons, abbreviated as N. A Newton is the force that causes a 1-kilgram mass to accelerate at a rate of 1 meter per second each second. (1 kg*m/s2)

Types of Forces Contact Forces Friction Force Tension Force Normal Force Air Resistance Force Applied Force Spring Force Action at a distance forces Gravitational Force Electrical Force Magnetic Force Nuclear Force

Forces are vectors! We can add vectors that are the same direction, subtract vectors that are in opposite directions! Net force is the is the vector sum of all the forces that act upon an object; or the overall force.

Free Body Diagrams You can use arrows to represent the direction and size of a force. The direction of the arrow indicates the direction of the force. The length of the arrow represent the size, or magnitude, of the force.

Balanced vs. Unbalanced Forces When the forces on an object are balanced, there is no change in the objects motion Force of the foot on the wall is balanced with the force of the wall on the foot = no change in the walls motion.

Balanced vs. Unbalanced Forces When an unbalanced force acts on an object, the object accelerates. Force of the foot on the ball is greater than the force of the ball on the foot = unbalanced force. The ball accelerates!

Balanced vs. Unbalanced Forces 20 N to the left 20 N to the right What is the net force acting on the truck? 20 N – 20 N = 0 N Forces are BALANCED!

Balanced vs. Unbalanced Forces What is the net force acting on the truck? 100 N – 60 N = 40 N to the right Forces are UNBALANCED! Truck accelerates in the direction of the greater force.

Balanced vs. Unbalanced Forces What is the net force acting on the truck? 10 N + 10 N – 7 N = 13 N to the right Forces are UNBALANCED! The car accelerates in the direction of the greater force.

Sometimes you cannot simply add or subtract vectors…

Physics of Skydiving http://waowen.screaming.net/revision/force&motion/skydiver.htm

Terminal Velocity Terminal velocity- of a falling body occurs during free fall when a falling body experiences zero acceleration (constant velocity) because the forces of air resistance and gravity are balanced!

Can an object still be moving if forces are balanced (zero acceleration)? Explain!