القوى هي دفعات وجذب تتحكم في كل شيء في الكون. يمكن أن تتسبب في تحريك الأشياء أو تسريعها أو إبطائها أو تغيير اتجاهها أو حتى تغيير شكل الأشياء. ستساعد الأنشطة التالية الطلاب على فهم القوة والحركة حتى يتمكنوا من فهم العالم من حولهم بشكل أفضل.
A Soyuz re-entry capsule just after the parachute has been released
الانزلاق: 4
A Soyuz re-entry capsule at rest on the ground
الانزلاق: 5
Thrust
Weight
Drag
The Soyuz orbital module is in orbit. Even though it's speed may be constant it's velocity is changing as it changing direction. Forces are unbalanced. The only force acting on the module is its weight.
الانزلاق: 6
Weight
The Soyuz orbital module is in orbit. Even though it's speed may be constant it's velocity is changing as it changing direction. Forces are unbalanced. The only force acting on the module is its weight.
الانزلاق: 7
Drag
Weight
The capsule is decelerating so the forces aren't balanced. The drag from the parachute must be larger than the weight of the parachute and the capsule.
الانزلاق: 8
Weight
Reaction force
The forces are balanced, as the capsule is not moving. The reaction force acting on the capsule from the ground is equal and opposite to the weight of the capsule.