Unit 2 Force and Motion 7.7D PART 1

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-PS2-1

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
• Objects in motion tend to remain in motion until acted upon by an another force. 
• Force is defined by mass times acceleration

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NGSS.MS-PS2-1

A student walking quickly while carrying an orange on his lunch tray stops suddenly. The orange will most likely roll off the tray due to

• inertia of the orange. 
• the friction acting on the orange.
• the balanced forces acting on the orange.

Tags

NGSS.MS-PS2-2

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

What is speed?

• Speed is how far something travels in one hour.
• 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

When an object's distance from another object is changing, the object is .... 

• under pressure.
•  in motion
• not moving.

Tags

NGSS.MS-PS2-2

 If an unbalanced force acts on a stationary object, the object will:.

• move away from the force
• accelerate in the direction of the force
• accelerate in the opposite direction of the force

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NGSS.MS-PS2-2

If no force is being applied to a stationary object, the object will...

• remain stationary.
• move at a constant speed in the direction of the force.

Imagine you're pushing a shopping cart. What happens to the cart's acceleration if you push it with more force?

• It decreases

• It stays the same

• It increases

• It stops

Answer explanation

When the force applied on an object increases, its acceleration also increases according to Newton's second law of motion.

Tags

NGSS.MS-PS2-2

A car accelerates from rest on a straight road. What does the car's acceleration depend on?

• Its color and shape

• Its mass and the force applied to it

• Its volume

• Its temperature

Answer explanation

An object's acceleration depends on its mass and the force applied to it, not its color, shape, volume, or temperature.

Tags

NGSS.MS-PS2-2