**1.**

**How much force is needed to accelerate a 66 kg skier at 2 m/sec**

^{2}

**?**

**2.**

**What is the force on a 1000 kg elevator that is falling freely at 9.8 m/sec**

^{2}

**?**

**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/sec**

^{2}

**?**

**5.**

**A 50 kg skater pushed by a friend accelerates 5 m/sec**

^{2}

**. 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/sec**

^{2}

**. 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/sec**

^{2}

**; a second ball rolled with the same force accelerates 4 m/sec**

^{2}

**. 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/s**

^{2}

**. 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/s**

^{2}

**. What force is required?**