## Thursday, 11 September 2014

### FORCE , MASS AND ACCELERATION PROBLEMS

1.     How much force is needed to accelerate a 66 kg skier at 2 m/sec2?

2.     What is the force on a 1000 kg elevator that is falling freely at 9.8 m/sec2?

3.     What is the acceleration of a 50 kg object pushed with a force of 500 newtons?

4.     The mass of a large car is 1000 kg.  How much force would be required to accelerate the car at a rate of 3 m/sec2?

5.     A 50 kg skater pushed by a friend accelerates 5 m/sec2.  How much force did the friend apply?

6.     A force of 250 N is applied to an object that accelerates at a rate of 5 m/sec2.  What is the mass of the object?

7.     A bowling ball rolled with a force of 15 N accelerates at a rate of 3 m/sec2; a second ball rolled with the same force accelerates 4 m/sec2.  What are the masses of the two balls?

8.     If a 60 kg person on a 15 kg sled is pushed with a force of 300 N, what will be person’s
acceleration?

9.     A force of 20 N acts upon a 5 kg block.  Calculate the acceleration of the object.

10.  An object of mass 300 kg is observed to accelerate at the rate of 4 m/s2.  Calculate the force required to produce this acceleration.

11.  A 5 kg block is pulled across a table by a horizontal force of 40 N with a frictional force of 8 N opposing the motion.  Calculate the acceleration of the object.

12.  An object of mass 30 kg is in free fall in a vacuum where there is no air resistance. Determine the acceleration of the object.

13.  An object of mass 30 kg is falling in air and experiences a force due to air resistance of 50 newtons.
a.      Determine the net force acting on the object and
b.      calculate the acceleration of the object.

14.  A student pushes on a crate with a force of 100 N directed to the right.  What force does the crate exert on the student?

15.  A force of 200 N is exerted on an object of mass 40 kg that is located on a sheet of perfectly smooth ice.
a.    Calculate the acceleration of the object.
b.    If a second object identical to the first object is placed on top of the first object, what acceleration would the 200 N force produce?

16.  Just before opening her parachute a skydiver of mass 50 kg reaches terminal velocity. Calculate  the force of air resistance.

17.  For a person who has a mass 60 kg, calculate the weight in Newtons and in pounds.

18.  An object of mass 10 kg is accelerated upward at 2 m/s2.  What force is required?