Ch 7 Newton's 3rd

Whenever one object exerts a force on another object, the second object always exerts a force back on the first object. 

• True
• False

A rocketship is pushed forward by gases that are forces out of the back of the ship. 

• True
• False

In order to make a cart move, a horse must pull harder on the cart than the cart pulls back on the horse. 

• True
• False

A bicycle and a parked car have a head on collision. The force of impact is greater on the bicycle. 

• True
• False

A bicycle and a parked car have a head on collision. The negative acceleration is greater on the bicycle. 

• True
• False

If a train is pulling a caboose, the caboose will move if they train exerts a force on the ground that is greater than the force that the caboose exerts on the train. 

• True
• False

Whenever an objects exerts a force on another, the second object exerts a force of the same magnitude, but in the opposite direction of the first. 

• Sometimes True
•  Always False
• Always True

Forces always occur 

• as single quanitities
• by themselves
• in pairs
• in triplets

An archer shoots an arrow. Consider the action force to be the bowstring against the arrow. What is the reaction force? 

• the arrow's push against the bowstring
• weight of the arrow
• friction fo the ground against the archers feet
• air resistance against the arrow

A person is attracted towards the earth by a 440N gravitational force. The force with which the Earth is attracted to the person is

• 440N
• very small
• very large