An object will only move when....

What are two types of forces?

What invisible force causes a skateboard to roll downhill when you let go?

When a skateboard is sitting flat on the ground, what 2 forces are working on the skateboard?

What is the most common unit for measuring force?

What tool is used to measure force?

What objects are interacting to make a bicycle move?

What objects are interacting when you throw a ball straight up in the air?

Look at the diagram with the spring scales. What is the force in newtons on EACH load?

True or False: Mass is how much matter an object has.

True of False: Weight is the downward force of gravity on a mass.

What is NOT an example of an invisible force?

What Greek philosopher's ideas about motion were incorrect but accepted for almost 2000 years?

Many people consider him the father of modern science.

What is the force between surfaces?

Newton's 1st law of motion states "Every object stays at ______ unless an outside force acts on it."

Newton's 2nd law of motion states "The __________ of an object is directly proportional to the force on the object. It is inversely proportional to its mass."

Newton's 3rd law of motion states "For every action, there is an equal and ________ reaction."

Which surface has less friction?

What surface has more friction?

If one tug of war team is pulling with 600 N in one direction and the other team is pulling with -600 N, what is the net force on the rope?

If gravity is pulling a laptop down with a force of 20 N, what is the force of the table pushing up?

Say you apply a little horizontal push (force) to a laptop and it does not move sideways. What force is resisting the laptop's motion?

Think about tug of war. Team A has three members who pull with the following forces: +180 N, +200 N, and +190 N. Team B has three members who pull with the following forces: -200 N, -180 N, and -191 N. Which team would win?