Newton's Third Law of Motion

12/2 - Newton's 3rd Law of Motion

​Newton's 1st and 2nd Laws Review

Multiple Choice

Which shopping cart will have more acceleration?  

• The empty shopping cart
• The shopping cart that's full
• They will be the same

Multiple Choice

A person not paying attention while skateboarding hits a rock. The skateboard stops...they don't.

• The Law of Inertia (1st law)

• The Law of Acceleration (2nd law)

• Action Reaction Law (3rd law)

Multiple Choice

This person bought coffee and put it on the seat next to them. If they stopped quickly and the coffee spilled which law would that represent?

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

Multiple Choice

A force of 90N is applied to each cart below, which one will accelerate the fastest?

• Cart 1
• Cart 2
• Cart 3 
• Cart 4

Multiple Choice

You are riding in a vehicle with a coffee cup on the dashboard while traveling 30 km/h. The vehicle makes a sudden stop to avoid hitting the car that has stopped in front of it. Which illustration best demonstrates what would happen to the coffee cup?

Multiple Choice

If you increase the mass on an object, its acceleration

• decreases
• stays the same
• also increases
• stops

Multiple Choice

How does a continental plate demonstrate Newton's law of inertia?

• A continental plate will continue to move until it cracks from the pressure applied by Earth's atmosphere.

• A continental plate will continue to move until it crashes into or slides against another continental plate.

• A continental plate will continue to move until it melts into molten rock from the heat of the Sun.

• A continental plate will continue to move until it travels back to its original location on Earth's surface.

Multiple Choice

Which of these best explains why the coin fell straight down into the cup instead of remaining on the index card?

• The coin was at rest until the card was removed, so it tended to remain in the same location. Once the card was gone, the unbalanced force of gravity caused the coin to fall.

• Moving the card applied an action force on the coin. Since the card was gone, gravity applied a reaction force on the coin.

• The card had less mass than the coin, so a smaller force of gravity acted on the card. The larger force of gravity on the coin made it fall.

• The acceleration of the coin falling into the cup was equal and opposite to the acceleration of the card.

Multiple Choice

Two students are in a baseball game. The first student hits a ball very hard and it has a greater acceleration than the second student who bunts the ball lightly.

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

Multiple Choice

If the man pushes with an equal amount of force, which object will accelerate more?

• Car because it has more mass

• Lawnmower because it has less mass

• Car because it has less mass

• Lawnmower because it has more mass

Multiple Choice

Two skaters begin at rest. Skater 1 has a smaller mass than Skater 2. After they push off each other,...

• Skater 1 experiences a greater change in momentum
• Skater 2 experiences a greater change in momentum
• Skater 1 has a greater velocity than Skater 2
• Skater 1 experiences a greater force

Multiple Choice

Ray is sitting on a couch. Gravity exerts a downward force on him. Based on Newton's law of action-reaction, the other force acting on Ray is the -

• upward force of the couch

• upward force of momentum

• downward force of air pressure

• downward force of the floor

Multiple Choice

A pitcher throws a ball toward a player holding a softball bat. The player uses the bat to hit the ball. The bat applies a 10 N force to the ball.

Which statement correctly describes the reaction force between the bat and the ball?

• The reaction force is the force that causes the ball to move toward the bat.

• The reaction force is the force applied to the bat by the player holding the bat.

• The reaction force is the force that pulls the ball toward the ground .

• The reaction force is the force of the ball on the bat.

Multiple Choice

How can Newton's law action-reaction best be applied to explain the movement of a rocket

• as the fuel burns, gases push against the rocket, moving it upward.

• as the fuel burns, gases move out of the rocket and reduce air resistance.

• as the fuel burns, the mass of the rocket decreases.

• as the fuel burns, the rocket moves faster.

Multiple Choice

An Action reaction pair forces exists between

• The aerialist's feet and the rope.

• The rope and the balancing bar.

• The two ends of the rope.

• The aerialist's arms and legs.

Multiple Choice

Newton's 3rd Law states that for every action, there must be a

• equal and opposite reaction

• equal reaction in the same direction

• unequal and opposite reaction

Multiple Select

Which of the following makes use of Newton's 3rd Law? (you may choose more than 1 correct answer)

• A swimmer kicks off the wall when making a turn.

• A helicopter hovering in the air.

• A badminton player hitting the shuttlecock with his racket.

• A ball dropping down from a height.

• A runner pushing running on a track.

Multiple Choice

Which statement best describes an action reaction force pair in this situation?

• The wall pushes on the skater when the skater pushes on the wall.

• The wheels slow down, and the skater stops.

• The skater exerts a force on the wall, and the wheel exerts a force on the floor and begin to turn.

• The friction of the floor decreases when the wheels roll on the floor

Multiple Choice

A ball bounces on the ground. Which of the following is true?

• The force that the ball exerts on the ground is larger than the force the ground exerts on the ball.

• The force that the ball exerts on the ground and the force the ground exerts on the ball are equal in magnitude.

• The force that the ball exerts on the ground is smaller than the force the ground exerts on the ball.

Multiple Choice

A football player kicks the football with all his might. Which statement is true?

• The player exerts a force on the ball that is larger than the force the ball exerts on the player.

• The player exerts a force on the ball that is equal in magnitude to the force the ball exerts on the player.

• The player exerts a force on the ball that is smaller than the force the ball exerts on the player.