An object at rest remains at rest and an object in motion remains in motion unless acted on by an unbalanced force.

Acceleration of an object depends on the mass of the object and the force applied.

For every action there is an equal and opposite reaction.

 If you slide a hockey puck on ice, eventually it will stop, because of friction on the ice.

When you jump, your legs apply a force down to the ground, and the ground pushes back up on you.

 If you use the same force to push a truck and push a car, the car will have more acceleration than the truck, because the car has less mass.

 It is easier to push an empty shopping cart than a full one, because the full shopping cart has more mass than the empty one.

The law of inertia

When Molly drives to work, she always places her lunch bag on the passenger’s seat. By the time she gets to work, her lunch bag has fallen on the floor in front of the passenger seat. Why does this happen?

The resistance an object has to a change in its state of motion

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