Chapter 2

State Newton's first law. ___________

State Newton's second law in equation form. ___________

Is acceleration a scalar or a vector quantity? ___________

A net force is acting on an object, causing it to accelerate at \(6 \mathrm{~m} / \mathrm{s}^{2} .\) Determine the resulting acceleration if (a) the force is halved; (b) the mass is halved; (c) both the force and the mass are halved. ___________

Three newtons are exerted northward on a \(10-\mathrm{kg}\) object while \(4 \mathrm{~N}\) are exerted southward. What is the acceleration of the object? ___________

What is the unit of force in the SI system? ___________

Explain why a heavier object does not fall faster when dropped, since the accelerating force (its weight) is greater. ___________

You toss a ball upward into the air. Immediately after it leaves your hands, what forces are acting on the ball? Identify the agents of the forces on the ball and whether they are contact or long-range forces. ___________

The acceleration of gravity is \(9.8 \mathrm{~m} / \mathrm{s}^{2}\) downward. In actual practice, does an object continue to accelerate if dropped from a tall building? Explain. ___________

State Newton's third law. ___________

Your weight is the result of the earth's downward gravitational force on your body. What is the corresponding reaction force? ___________