Newton’s 2nd Law Problems for the Beginner…
1. An unbalanced force of +25 N is applied to a 12 kg mass. What is the acceleration of the mass?
2. A shot-putter exerts a net force of 140 N, up on a shot, giving it an upward acceleration of 19 m/s². What is the mass of the shot?
3. A 1.5 kg mass accelerates across a smooth table at 16 m/s², left. What is the net force that caused this acceleration?
4. An object is moving with a constant velocity. It then has an unbalanced force applied to it. If the unbalanced force is 20.0 N, south and the mass of the object is 3.75 kg, what is the acceleration of the object while the force is acting?
5. What is the weight of an 800 kg car? What is the mass of a small yacht that weighs 14,700 N?
6. In a tug-of-war, Aubree pulls to the left with 855 N of force while Alexa pulls to the right with 835 N of force. Find the net force on the rope. If the rope’s mass is 2.00 kg, find its acceleration.
7. A rubber ball weighs 49 N. What is the acceleration of the ball if an upward force of 69 N is applied to it? (HINT: find the net force on the ball first.)
8. How much force must be applied to a 30.0 kg stone to accelerate it upward at 12.0 m/s²?
9. A rocket weighs 9800 N. How much applied force will give it an acceleration of 4.0 m/s²up?
10. A force of 91 N is exerted straight up on a stone that has a mass of 750 g. Find:
a. the weight of the stone.
b. the net force acting on the stone.
c. the acceleration of the stone.