Ch. 2 Forces: Friction, Gravity and Newton's Laws of Motion

If these boys are pulling with the same amount of force.  What will happen?

• The boy in blue will win.
• They will not move at all.
• The boy in red will win.
• Both will fall down.

Why is it harder for the boy in Image B to get down the hill?

• Motion
• Friction
• Work
• Displacement

It takes more force to accelerate the iron man on the left than the iron man on the right because the iron man on the left has more mass. This best describes

• Newton's first law, the law of inertia
• Newton's second law, the law of acceleration
• Newton's third law, the law of action reaction 
• The law of universal gravitation

The formula 
? = mass x acceleration
or 
? = m x a 
is used to find 

• Force
• Velocity
• Momentum
• Gravity

For every action, there is an equal and opposite reaction.

• Newton's
  1st
  Law of Motion
• Newton's
  2nd
  Law of Motion
• Newton's
  3rd
  Law of Motion

• 1st
• 2nd
• 3rd

• 1st
• 2nd
• 3rd

If an object is stationary (not moving) the forces acting upon it are _____________

• unbalanced
• weak
• balanced
• Hulk Smash!

A squirrel sits on the ground and eats a donut. We know the forces on him must be balanced because...

• Forces are always balanced

• the squirrel is not accelerating

• squirrels are projectiles

• he's eating a donut

What is the net force

• 10 N
• 0 N
• 25 N
• 1 N