Net Forces.Newton's Laws

At one moment during a walk around the block, there are four forces exerted upon Fido - a 10.0 kg dog. The forces are:

F_app = 67.0 N at 30.0° above the horizontal (rightward and upward) F_norm = F_frict = 27.6 N, left F_grav = 98 N, down

Draw a free body diagram ,+ directions , x,y table , Newton's second law equations , Solve for the unknown

Resolve the applied force (F_app) into horizontal and vertical components, then add the forces up as vectors to determine the net force.

Find Fnormal = ?

Fnet = ?

a= ?

coefficient of friction

dA pack of three Artic wolves are fighting over the carcass of a dead polar bear. A top view of the magnitude and direction of the three forces is shown in the diagram to the right.( show + direction , x,y table, find Fnet,x , Fnety, Fnet magnitude and direction )

a. Determine the resultant or net force acting upon the carcass. b. Determine the acceleration of the 750-kg polar bear carcass.

Renee is on Spring Break and pulling her 21-kg suitcase through the airport at a constant speed of 0.47 m/s. She pulls on the strap with 120 N of force at an angle of 38° above the horizontal. Determine the normal force and the friction force experienced by the suitcase. Determine the coeficient of friction between the suitcase and the floor.Draw a free body diagram ,+ directions , x,y table , Newton's second law equations , Solve for the unknown

Which vehicle has more inertia as they come to a stop?

If I apply a larger force to the same toy car, what do you predict will happen to the speed and distance traveled by the car. WHY?

Balanced forces cause a change in motion.

Calculate the net force and describe the direction of movement.

Will this rocket be able to lift off? Explain your answer using your net force calculations

When finding net force, why must you know the directions of the forces acting on an object?