newton's 2nd law of motion

What is the term used to describe the speed and direction of a moving object?

• Acceleration

• Velocity

• Inertia

• Force

At a traffic light the light turns green.  The driver steps on the gas pedal and the car begins to move faster and faster.  Then the driver takes their foot off the pedal, and the car begins to slow down.  This is a description of:

• inertia

• acceleration

• magnitude

• velocity

Like velocity, acceleration is a vector. What does the length of the arrow representing a vector indicate?

• The direction of acceleration

• The amount of acceleration

• The amount of velocity

• The direction of velocity

Acceleration is a change in velocity. Which of the following describes when an object accelerates?

• Changes direction only

• Only speeds up

• Only slows down

• Speeds up and slows down

You are driving in a car maintaining a constant speed. The driver makes a turn. What changes?

• The speed of the car

• Nothing changes because of the law of inertia

• The acceleration of the car

• The direction the car travels

An object accelerates when its velocity changes. That means an object accelerates when:

• Its inertia changes

• It becomes a balanced force

• It decreases its speed

• It increases its speed

• It changes direction

What is the combination of all the forces acting on an object called?

• Gravitational forces

• Balanced forces

• Frictional forces

• Net force

What is the amount of matter in an object called?

• Mass

• Gravity

• Friction

• Inertia

According to Newton's Second Law of Motion, the acceleration of an object is equal to the net force exerted on the object divided by the object's mass.

• The frictional force applied to the object

• Newton's 2nd law of motion

• The net force acting on it

• The object's inertia

What is the acceleration of an object when it moves at constant velocity?

• No change in acceleration, zero

• Decreasing acceleration

• No object can maintain zero acceleration so there is always an increase or decrease

• Increasing acceleration