SPS8b - Newton's Laws

An ice skater at rest pushes against a sled at rest, causing both the skater and sled to move away from each other with different accelerations. This is an example best described by

• 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.

How does Newton’s third law explain how a rocket takes off?

• The rocket’s acceleration is positive, while the gasses acceleration is negative but the direction is the same. 
• The rocket is at rest until ignition.
• The hot gasses move in one direction, while the rocket moves in the opposite direction but with equal force.

For every action there is an equal and opposite reaction; equal in force and opposite in direction.

• Newton’s first law of motion
• Newton’s second law of motion
• Newton’s third law of motion

If a force of 26 N is exerted on two balls, one with a mass of 5 kg and the other with a mass of 8 kg, which ball will have the greater acceleration?  (F=ma)

• The one with a mass of 8 kg will have the greatest acceleration.
• The one with a mass of 5 kg will have the greatest acceleration.
• They will both accelerate at the same rate.

A greater applied force is required to move an object with a greater mass than one with a smaller mass.

• True
• False

If you are driving forward and suddenly break, what would happen to your body and which law does that demonstrate?

• go back,  Law of inertia
• move forward,  Law of inertia

An object in motion will stay in motion and an object at rest will stay at rest unless acted upon by an outside force.  Which law does this describe?

•  Law of inertia
•  Law of acceleration
• Law of action - reaction

In a football game, two players tackle each other so hard that they both fly in opposite directions after they hit each other.  What law of motion is this an example of?

•  Law of inertia
• Law of action - reaction
• Law of acceleration

A student leaves a pencil on a desk and it stays there until I pick it up. 

•  Law of inertia
• Law of acceleration
• Law of action - reaction

Which law explains when a magician pulls a tablecloth out from under dishes and glasses on a table without disturbing them.

• Law of inertia
• Law of acceleration
• Law of action - reaction