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Net Forces.Newton's Laws

Last updated about 5 years ago

9 questions

Note from the author:

Net Force Diagrams. Newton's Laws

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Question 1

1.

At one moment during a walk around the block, there are four forces exerted upon Fido - a 10.0 kg dog. The forces are:
Fapp = 67.0 N at 30.0° above the horizontal (rightward and upward) Fnorm = Ffrict = 27.6 N, left Fgrav = 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 (Fapp) into horizontal and vertical components, then add the forces up as vectors to determine the net force.
Find Fnormal = ?
Fnet = ?
a= ?
coefficient of friction

Question 2

2.

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.

Question 3

3.

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

Question 4

4.

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

Tractor Trailer

Mini Cooper

They have the same inertia

Question 5

5.

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?

Question 6

6.

Balanced forces cause a change in motion.

True

False

Question 7

7.

Calculate the net force and describe the direction of movement.

Question 8

8.

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

Question 9

9.

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