Here we look at Newton's three laws of motion starting with inertia, then force causes acceleration, and lastly action reaction pairs. In this section we will look at the difference between mass and weight. Then look at additional forces like air resistance, friction, and ones created on an incline plane.
The first law of motion is about inertia. An objects resistance to a change in motion. An object in motion stays in motion and an object at rest stays at rest. So this the state of motion wont change unless acted upon by an outside force.
Force alone does not cause a change in motion if balanced by another. When there is a non-zero net force an object will accelerate.
Once your done with the lesson do this for more practice:
Mass is determined by the molecular composition of an object. Weight is a force created by the pull of an object towards another like the earth. Learn the difference and see how to use the weight equation (Fw = mg) here.
No force in the universe is ever created without an equal and opposite reaction force. Learn about action reaction pairs and the accelerations that result from these.
The weight of an object on an incline plane creates forces that push into the hill and down the hill along with many others. Learn how to determine these forces and an objects acceleration on an incline plane.
When you pull a spring a force is created in the opposite direction of the pull. Hooke's Law (Fspring = -kx) relates the type of spring to the force required to displace it.