FORCE Any push or pull on an object

TERMS • Concurrent forces- Two or more forces that act through a single point. • Resultant Force- A single force that represents the sum of two or more forces.

• Components of force- the two perpendicular forces that will give the resultant force Fx = F cosѲ Fy = F sinѲ • Frictional force- (Ff) Any force that opposes a motion.

• Equilibrium force (Fe)-Force that is equal to the resultant force but in the opposite direction. Net force is zero and the object is at rest or traveling at a constant velocity. • Normal Force (Fn)- Force between contact surfaces

• Spring Force (Fs) – force due to the stretch or compression of a spring. • Centripetal force (Fc)Force produced by an object traveling in a circular path

PARALLEL VECTORS If the gravitational force is equal to the cable force, the elevator is traveling at a constant velocity or its at rest. If gravitational force is greater, it accelerates downward. If cable force is greater, it accelerates upward

FORCES AT RIGHT ANGLES Two tug boats are pulling a barge by tow lines. One pulls north with a force of 10, 000 N and the other pulls east with a force of 7, 500 N. What will be the resultant force on the barge? c 2 = a 2 + b 2 c 2 = 10, 000 N 2 + 7500 N 2 c = 12, 500 N Tan Ѳ = 10, 000 7500 Ѳ = 53° C = 12, 500 N @ 53° NE

EQUILIBRIUM FORCE If the tug boats and barge are not moving, what force is the barge exerting? F = 12, 500 N @ 53°NE Fe = 12, 500 N @ 233°SW

COMPONENTS OF FORCES A girl pulls a sled with a force of 100 N. If the rope is held at 37° find the horizontal and vertical components of the applied force. Fy Fx = F cosѲ Fx = 100 N cos 37° Fx= 79. 9 N Fy = F sinѲ Fy = 100 N sin 37° Fy = 60. 2 N