SGM Newton's Laws 8.7B

A 3000.0 kg sailboat is pushed by a steady wind. The sailboat accelerated at 2.0 m/s² to reach a speed of 30.0 m/s. During this acceleration, what was the net force on the sailboat to the nearest newton?

• 6000 N

• 5000 N

• 4500 N

• 2500 N

A golfer hits a golf ball with a force of 30 N. The mass of the golf ball is 0.08 kg. Which expression can be used to find the acceleration of the golf ball? (Level 1)

• 0.07 kg • 30 N

• 0.07 kg - 30 N

A student on a boat decided to go for a swim. He dove off the back of the boat, as shown in the diagram. Based on the law of action-reaction, in what direction will the boat most likely move as the student jumps off?

• West

• South

• North

• East

A book is motionless on a table. Which statement best explains why the book remains motionless?

• The table exerts an unbalanced force on the book.

• The forces acting on the book are balanced.

• The only force acting on the book is directed toward the table.

• There are no forces acting on the book.

Look at the illustration below. If the swimmer exerts a horizontal force against the wall to push off, the wall –

• destroys the force.

• exerts a stronger horizontal force in the same direction.

• exerts a horizontal force that is equal and opposite to the swimmer’s force.

• exerts a weaker horizontal force than the swimmer’s force.

A person riding a motorcycle is involved in a collision causing the motorcycle to stop and the rider to fly forward. Which of these best explains why the rider flew forward instead of remaining on the motorcycle?

• The rider had more mass than the motorcycle, so a larger unbalanced force acted on the rider, causing him to fly forward.

• Stopping the motorcycle applied an action force on the rider. Since the motorcycle stopped, gravity applied a reaction force on the rider

• The rider was in motion until the motorcycle was stopped by the collision, so the rider tended to remain in motion.

• The acceleration of the rider flying forward was equal and opposite to the acceleration of the motorcycle.

The masses of four toy cars and the net force acting on them as they enter a track are recorded in the table below. Which toy car has the greatest acceleration as it enters the track?

• Toy car 1

• Toy car 2

• Toy car 3

• Toy car 4

The diagram below represents a demonstration of Newton’s third law. How does this law best explain the resulting motion of the chair? (Level 3)

• As the fire extinguisher releases the gas, the chair will move forward.

• As the fire extinguisher releases the gas, the chair will move backwards.

• As the fire extinguisher releases the gas, the chair will move upwards.

• As the fire extinguisher releases the gas, the chair will not move.

A 2000 kg car has an applied forward force of 5000 N and experiences an air resistance of 1000 N. Based on this information, what is the car’s acceleration?

• 1.005 m/s²

• 1.075 m/s²

• 3.005 m/s²

• 4.005 m/s²

The pans on a balance are not equal when 10g of marbles are placed on one side and 3g on the other because:

• There is more mass on one side, creating an unbalanced force that tips the balance.

• Both sides have equal mass, so the balance stays level.

• The lighter side will go down due to less mass.

• Unbalanced forces have no effect on the balance.