Throughout this activity, we will look at six types of forces that impact us every day. The symbol for force is, and forces are measured in newtons - the reason for this will become apparent later in this activity! Don’t forget, that objects don’t necessarily need to be touching in order to interact, for instance the Earth can still exert gravity on an airplane in mid-air.įorce is a vector measurement, so there is always a direction associated with it. Any two objects, provided they are interacting with each other, will exert a force on each other. These pushing and pulling interactions between objects are called forces. And when she collides with the Earth (hopefully, lightly!) the Earth is, in effect, pushing on her, causing her forward motion to slow down quite quickly and stop. When she deploys her parachute, the parachute pulls her upward, causing her to go slower. Our parachutist is being pulled toward the Earth by the Earth’s force of gravity, causing her to go faster. In order for an object to change its speed, something needs to act on it: an object either needs to get pushed or pulled in a certain direction. Dynamics is the study of the causes of the different motions: uniform and non-uniform. What happens when you hit the brakes in a car that makes you come to a stop, or what happens to the parachutist as she jumps out of the plane that makes her fall faster and faster - this is the study of dynamics.
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