Forces Directions: Answer the following questions on the lines provided.

1. What is a force?

2. How can you know when an object has an unbalanced force on it?

3. Is it possible for an object at rest to have forces acting upon it? Explain.

4. What are the three types of friction and when does each apply?

Directions: Solve the following problems. Show your calculations in the spaces provided. w = m(a)

5. A baseball has a mass of 0.145 kilograms. If the acceleration due to gravity is 9.8 m/s2, what is
the weight of the baseball in newtons?

6. A suitcase with a mass of 2 kg has a weight of 18 N on a particular planet. What is the
acceleration due to gravity on that planet?

7. A grapefruit has a weight on Earth of 4.9 newtons. What is the grapefruit’s mass?