Force and Motion/Newtons Laws of Motion

Two girls are pulling on opposite ends of a rope with the same force. 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.

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

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. 
• centripetal force of the orange
• the friction acting on the orange.
• the balanced forces acting on the orange.

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.

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. 

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

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

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

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

What is the net force?

• 5 N
• 45 N to the left
• 5 N to the right
• 45 N to the right

Which one is balanced?

• top
• bottom
• both

What is the unit for FORCE? 

• N (Newtons)
• lbs (pounds)
• g (grams)
• m/s (meters per second)