Force & Motion Assessment

Isaac Newton discovered the three laws of motion. Which example BEST illustrates Newton's third law of motion, which describes action and reaction forces?

• a rocket takes off from the ground

• a book slides forward on a seat when the car stops

• a heavier ball falls at the same speed as a lighter ball

• a vehicle rounds a curve and changes its acceleration

Tags

NGSS.MS-PS2-1

An object that travels 100 m in 20 s has what speed?

• 200 m/s

• 5 m/s

• 2000 m/s

• 50 m/s

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

• The rocket is at rest until ignition.

• The rocket's acceleration is positive, while the gasses acceleration is negative but the direction is the same.

• The rocket is pulled up into outer space by the Sun's gravity.

• The hot gasses move in one direction, while the rocket moves in the opposite direction but with equal force.

When a hammer strikes a nail, the nail

• exerts balanced forces that helps it from moving.

• exerts a force equal to the weight of the hammer.

• exerts an unbalanced force that changes its velocity.

• exerts an equal and opposite force back on the hammer.

Tags

NGSS.MS-PS2-1

An object at rest experiences a 15 N force to the right and a 25 N force to the left. What is the net force, and how will the force affect the object?

• 35 N; The object will move to the right.

• 10 N; The object will move to the right.

• 35 N; The object will move to the left.

• 10 N; The object will move to the left.

Tags

NGSS.MS-PS2-2

You push on a desk with a force of 120 N to the right. Your friend pushes on the same desk with a force of 90 N to the left. What is the net force on the desk?

• 0 N

• 30 N to the left

• 30 N to the right

• 210 N to the right

Tags

NGSS.MS-PS2-2

Assuming the mass of the sled does not change, what will the acceleration be when 132 N of force are applied to the dog sled?

• 1.9 m/s2

• 2.2 m/s2

• 2.4 m/s2

• 2.9 m/s2

Tags

NGSS.MS-PS2-2

Which of the following free body diagrams shows an object at rest.

• A

• B

• C

• D

Which of the following is NOT an example of Newton's Third Law of Motion in action?

• A skateboarder kicks back on the ground and the skateboard moves forward.

• A bowling ball will fall to the ground before a feather.

• A swimmer pushes back on the wall of the pool to swim forward.

• The tires of a car exert a force on the road and the road exerts and equal force back on the tires.

Which notes show that Carla's bicycle is in motion

• 1,2, and 5

• 1,2, and 3

• 2,3, and 5

• 2,3, and 4