Physics Check Point

Newton's 1st Law of Motion?

• says that acceleration (gaining speed) happens when a force acts on a mass (object)

• An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.

• states that for every action (force) in nature there is an equal and opposite reaction.

• None of the above

Newton's 2nd Law of Motion is about Force. The formula is F=MA what does this stand for?

• F(force)=

  M(movement) X A(Acceleration)

• F(force)=

  M(mass) X A(Acceleration)

• F(friction)= M(magnetism) X A(Acceleration)

• None of the above

What is Newtons 3rd Law of Motion?

• An object at rest tends to stay at rest, an object in motion tends to stay in motion.

• Every action has an equal and opposite reaction.

• Force is a push or a pull.

• None of the above

Which diagram shows two stars that have the greatest gravitational force between them?

• A

• B

• C

• D

A horse gallops around a circular arena.  The centripetal force on the horse is ___.

• directed outward
• tension
• directed toward the center of the arena
• 9.8 N

Which of the following is the unit for centripetal force?

• J
• m/s²
• kg⋅m/s
• N

Units of Force (F)

• s

• kg

• m

• N

Units of mass (m)

• s

• N

• kg

• kg m/s

Units of momentum (p)

• kg m/s

• kg

• m/s

• Ns

Units of velocity (v)

• m/s²

• m/s

• N

• kg m/s