Forces & Definitions
"A push or a pull."
"What is a force?"
"If all forces on an object balance so it does not move, the net force is this."
"What is zero?"
"Between table A and table B: moving the same carton required 15N on table A and 25N on table B. Which table is smoother?"
"What is table A?"
"An instrument used to measure force."
"What is a spring scale?"
"A force that acts between surfaces in contact and resists motion."
"What is friction?"
"If a student pushes with 500N against a wall and the cart doesn't move, the wall pushes back with this amount of force."
"What is 500N?"
"True or False: A force is always a push."
"What is False?"
"The standard unit for measuring force in the metric system."
"What is the newton?"
"When a plant sits on a table, this force pulls the plant downward toward Earth."
"What is gravity?"
"In a tug-of-war, Team A pulls left with 1800N. To pull Team A into the mud, Team B must pull with (more, less, or equal to force) compared to Team A."
What is more than 1800N?"
"True or False: Rougher surfaces create more friction, so more force is needed to move something across the rougher surface."
"What is True?"
"A quantity that describes the energy of motion of a moving object."
"What is kinetic energy?"
"Rougher surfaces create more of this, so more force is needed to move an object across them."
"What is frictional force?"
"True or False: It takes more force to move an object with less mass."
"What is False."