Chapter 8 Test (Short Version)

Which is always a contact force?

• electric
• friction
• magnetic
• gravity

What is Newton's First Law?

• F=ma

• Every action has an equal and opposite reaction

• An object at rest stays at rest, an object in motion stays in motion.

A(n) __________ is a push or pull.

• newton
• acceleration
• force
• momentum

What pulls a ball back to earth?

• Balanced forces
• Gravity
• Friction
• Inertia

An object at rest will _______ if no outside forces are applied.

• Stay at rest
• Increase velocity
• Decrease mass
• Change direction

The SI units for force are...

• Kilograms
• Newtons
• Meters per second
• Pounds

A car and a truck are traveling at the same speed. As they slow down, the truck takes longer to stop. Why? 

• Newton’s first law of motion for objects at rest.
• Newton’s first law of motion for objects in motion.
• Newton’s second law of motion.
• Newton’s third law of motion.

The gravitational pull is greater between two objects that

• have greater masses.
• have rougher surfaces.
• are farther apart.
• are moving at greater speed.

The measure of the pull of gravity on an object is ___________________.

• motion
• weight
• speed
• friction

What are the two factors that determine the strength of gravity? 

• mass and distance 
• mass and matter
• distance and weight 
• weight and mass