Reading Check: Forces, Friction, and Gravity (6)

What is the SI unit used to measure force? 

• Pounds 
• Grams 
• Newtons 
• kg/ m²

You push on a tree with 20 N of force. If the tree doesn't move, the tree is pushing back on you with _____of force.

• 20N 
• 40N 
• 10N 
• 70N

What is the force acting between any two objects in the known universe all the time?

• Gravitational Force 
• Force of Friction 
• Normal Force 
• Electromagnetic Force 

Forces that have a net force of zero and do not affect an object's movement are called ____

• balanced forces

• unbalanced forces

• frictional forces

• gravity

Which two factors affect the strength of gravity?

• Mass and weight

• Speed and mass

• Force and distance from the source of gravity

• Distance from the source of gravity and mass

What is the difference between mass and weight?

• Nothing. They are the same.

• Mass is how much "stuff" something is made of, and weight is how much gravity pulls on that "stuff".

• Weight is how much "stuff" something is made of, and mass is how much gravity pulls on that "stuff".

• Mass is how heavy something is, and weight is how much "stuff" something is made of.

As distance between two objects increase the pull of gravity 

• Increases
• Decreases
• Stays the same

If Earth's mass was cut in half, what would happen to your mass?

• increase because gravitational force increases
• decrease because gravitational force decreases
• decrease because gravitational force increases
• nothing, mass is not affected by gravitational force

What states that "every object in the universe attracts every other object"?

• Law of Universal Gravitation
• Newton's First Law of Motion
• My mother
• Inertia & gravity

What is the net force on the object?

• 3 N right

• 6 N right

• 9 N right

• 9 N left