Forces and Newton's First law

The tendency of an object to resist a change in its state of motion is called the object's ______.

• incline
• straight line
• friction 
• inertia 

The ______of an object tends to make the object resist being set into motion.

• mass
• force
• motion
• unbalanced forces 

Without a force to stop or slow a coasting object, the object will coast forever in a ______ line. 

• blue
• red
• straight
• vertical 

friction is a force that acts 

• in the same direction as the motion
• opposite to the direction of the motion
• opposite to the applied forces
• the same direction as the applied force

What kind(s) of objects have inertia?

• all objects with mass
• only objects at rest
• only objects in motion
• only objects whose motion is being changed

What is Newton's First Law all about?

• Balanced forces

• Unbalanced forces

• Changing forces

• Resultant forces

Describe what will happen to the truck in this picture

• Accelerate

• Decelerate

• Constant speed

• Stationary

Describe what will happen to the truck in this picture

• Accelerate

• Decelerate

• Constant speed

• Stationary

If an object is stationary, it means

• the object is in motion

• the object is experiencing air resistance

• there are balanced forces acting on the object

• there are unbalanced forces acting on the object

A ______ is a push or pull on an object.

• force

• speed

• acceleration

• velocity