Force and Motion 1

A brick is resting on a level, smooth surface. When a student applies a horizontal force of 5 N to the brick, the force of friction on the brick is also 5 N. Which statement BEST describes the effect of these two forces on the brick?

• The net force on the brick is 0 N, and the brick begins to move.

• The net force on the brick is 0 N, and the brick remains at rest.

• The net force on the brick is 10 N, and the brick begins to move.

• The net force on the brick is 10 N, and the brick remains at rest.

Tags

NGSS.MS-PS2-2

Which statement best explains why a car that is rolling on a level surface will eventually come to a stop?

• Frictional forces oppose the motion of the car.

• Forward motion slowly runs out as energy is expended.

• The natural state of an object is to be at rest.

• Inertia acting on an object will dissipate.

Tags

NGSS.MS-PS2-2

When astronauts walked on the Moon, they used weighted boots to help them walk due to the lower gravitational pull. What difference between Earth and the Moon accounts for the difference in gravity?

• density

• diameter

• mass

• volume

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NGSS.MS-PS2-4

Which of these is an example of Newton’s first law of motion?

• A baseball hit with a baseball bat travels faster than a bowling ball hit with the same force.

• A basketball bounces on the ground with the same force that the ground pushes up on the ball.

• A person jumps to a dock from a boat, and the boat moves away from the dock.

• A person standing on a bus moves backward when the bus suddenly moves forward.

Two girls are pulling on opposite ends of a thick rope. Both girls pull on the rope with the same force but in opposite directions. If both girls continue to pull with the same force, what will most likely happen? 

• One girl will pull the other toward her.
• Both girls will stay in the same place. 
• Gravity will cause the rope to sag. 
• The rope will break.

Tags

NGSS.MS-PS2-2

When a bird flies, its wings push air downward. As a result the air pushes back upward on the bird. Which law of motion most applies to the way the wings of a bird beat? 

• Every action has an equal and opposite reaction
• The rate of acceleration of an object depends on the amount of force applied.
• Objects in motion tend to remain in motion until acted upon by an another force. 
• Force is defined by mass times acceleration

Angela blows air into a balloon and holds the end of it closed with her fingers. When she lets go of the end of the balloon, Angela observes that the release of the air propels the balloon.  The propelling of the balloon from the release of the air is an example of which of Newton’s laws? 

• The force of an object is the product of its mass multiplied by its acceleration. 
•  A force of attraction exists between any two objects with mass. 
•  For every action, there is an equal and opposite reaction.
• An object in motion tends to stay in motion unless an unbalanced force acts upon it. 

Tags

NGSS.MS-PS2-1

A student reads his paper on friction to the class. Which statement should he include in his paper if he wants to present accurate information? 

• Friction increases mechanical advantage
• Friction opposes the direction of movement. 
• Friction makes movement of an object easier.
• Friction reduces the amount of work used to move an object. 

Kilometers per hour (kph) is a unit that describes which of the following?

• velocity
• direction
• position
• speed

Tags

NGSS.MS-PS3-1

What is speed?

• Speed is how far something travels in one hour.
• Speed is how fast it takes something to travel a set distance
• Speed is the distance something travels in a set amount of time.
• Speed is the change in velocity of something.

Tags

NGSS.MS-PS3-1