Force, Mass, Acceleration, Weight, Gravity

REMEMBER: A weight is a special case of force.

example 1: what is the mass of a 200. kg object?  200. kg

example 2: what is the weight of a 200. kg object?

                 weight = mass x gravity 200. kg x 9.8 m/s² = 1960 kg m/s² = 
1960 newtons

example 3: what is the mass of a 200. newton object?

                 mass = weight / gravity       200. kg m /s² / 9.8 m/s² = 20.4 kg

Problems:.

 

1.  What force is required to accelerate an object having a mass of 3 kg at 5 m/s²?

2. What is the mass of an object which is accelerated at 10. m/s² due to a force of 75 newtons?

3. What would be the acceleration of an object with a mass of 20.0 kg when hit with a force of 100. N?

4. What force is required to give a projectile weighing 500. newtons an acceleration of 3.00E+3 m/s²?

5. What would be the acceleration of an object with a mass of 100 kg hit with a force of 0 newtons?

6. What would be the mass of an object if it is accelerated at 1.95E-3 m/s² due to a force of 7.83 E 3 N?

7. Find the final velocity of an object, initially at rest, that falls freely for 3.00 seconds.

8. Find the height of a tower if an object dropped from the top reaches the ground in 10.0 seconds.

9. 169 newtons are applied to an object with a rest weight of 1.30 E 3 N. What is the resultant acceleration?

10. A car, starting from rest, accelerates at 8 miles per hour per second, giving it what velocity at the end of 4 seconds?

 

*11. A toy airplane that is flying at 7 m/s speeds up to 18 m/s in 4.5 seconds due to a force of 1.76E-3 N. Using this information what is the mass of the toy?

*12. If a 12 pound ball is dropped and attains a velocity of 8.8 ft/s in 3.0 seconds on the planet Oogabooga (with a gravity different from Earth's of course) what is the mass of the ball?

*13. If a ball is dropped and attains a velocity of 29.31 m/s in just 3.00 seconds, what is the acceleration of gravity?