Principles of Force Key Concepts

Force is:

• a type of energy

• a push or pull on an object

• the speed of an object

• the mass of an object

Forces are described and calculated by:

• Measuring mass and acceleration and using Newton's Second Law

• Observing color changes in objects

• Counting the number of objects in motion

• Measuring temperature changes

Applying a force on an object can:

• Change its shape or motion

• Change its color

• Change its temperature only

• Change its mass

Directions are incorporated when calculating forces by:

• Adding the magnitudes only

• Ignoring the directions

• Using vector addition

• Multiplying the forces

Force is measured in units of ________.

• Newtons (N)

• Joules (J)

• Watts (W)

• Pascals (Pa)

Which of the following is NOT a characteristic of force?

• A) Has magnitude

• B) Has direction

• C) Is measured in kilograms

• D) Is measured in Newtons

Newton's 1st Law of Motion states that an object continues to move at a ________ velocity or remains at rest if there are no outside forces acting upon it.

• constant

• increasing

• decreasing

• random

According to Newton's 2nd Law of Motion, what is the equation for net force?

• F_net = ma

• F_net = mv

• F_net = mg

• F_net = m/a

In Newton's 3rd Law of Motion, the force exerted by one object is equal in magnitude and ________ in direction to the force exerted by the second object.

• opposite

• same

• perpendicular

• random

What are force interactions?

• When a single force acts on an object

• When multiple forces act on an object

• When no force acts on an object

• When only gravity acts on an object