1. Newton’s First and Second Laws
Chapter 12
Section 1

2. Newton’s First Law
When a force is applied, an object will have a change in the state of motion.
Also known as inertia.

3. Newton’s First Law
Inertia is why you seem to slide when you make a sharp turn in a car.

4. Newton’s Second Law
Objects will speed up or slow down depending on unbalanced forces acting on them.
Force equals mass multiplied by acceleration
F = ma

5. Practice #1
What net force is needed to accelerate a x 103 kg vehicle forward at 2.0 m/s2?

6. Practice #2
A baseball accelerates downward at 9.8 m/s2. If the gravitational force is the only force acting on the baseball and is 1.4 N, what is the baseball’s mass?

7. Practice #3
A sailboat ant its crew have a combined mass of 655 kg. If a net force of 895 N is pushing the sailboat forward, what is the sailboat’s acceleration?

8. Practice #4
The net forward force on the propeller of a 3.2 kg model airplane is 7.0 N. What is the acceleration of the airplane.

9. Practice #5
A group of people push a car from a resting position with a force of 1.99 × 103 N. The car and its driver have a mass of 831 kg. What is the acceleration of the car?

10. Practice #6
If the space shuttle accelerates upward at 35 m/s2 , what force will a 59 kg astronaut experience?

11. Practice #7
A soccer ball is kicked with a force of 15.2 N. The soccer ball has a mass of 2.45 kg. What is the ball’s acceleration?

12. Practice #8
A person steps off a diving board and falls into a pool with an acceleration of 9.8 m/s2 , which causes the person to hit the water with a force of 637 N. What is the mass of the person?