2.2 Newton's Second Law

An object's velocity can be changed by changing its speed, its direction, or both.

• True
• False

A change in velocity over time is called ___________.

• speed
• force
• acceleration
• direction

Newton's second law of motion describes acceleration as force divided by __________.

• mass
• inertia
• speed
• direction

The force that pulls an object in a circular motion and keeps it in a circular motion is centripetal force.

• True
• False

The direction of the force that pulls an object in a circular motion is toward the ___________ of the circle.

• outside
• center
• left side
• right side

If a net force acts on a moving object in the direction that the object is moving, the object will slow down.

• True
• False

What happens when unbalanced forces act on an object at rest?

• the object remains at rest
• the object begins moving in an unpredictable direction
• the object begins moving in the direction of the net force
• the object begins moving opposite to the direction of net force

A 20 kg bike accelerates at 10 m/s2.  what was the force

• 25 Newtons
• 20 Newtons
• 200 Newtons
• 10 Newtons

What is the net force?

• 40 N left
• 0 N Balalnced
• 400 N right
• 40 N right

What Unit do we Measure Force in? 

• Newtons
• Joules
• Force
• Don't know