What are Forces? Module 3 What are forces? In module 2 we learned that a force is a push or a pull. We learned that Newton’s 2 nd Law states that a Force is equal to the mass of a moving object times its acceleration.
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The rougher the surface and the stronger the force between the surfaces, the greater the amount of friction.
Gravitation force is equal to weight, therefore…
Weight = mass X 9.8 m/s2
Weight = 70.0 kg X 9.8 m/s2
Weight = 686 N
Remember that 1 N = (1 kg) (1m/s2)
When an object is thrown into the air, two forces and two motions affect the movement of the object.
The object may be thrown horizontally with a certain force, but the vertical force of gravity combines to affect the motion.
Slow projectile - shoot a monkey
Fast projectile - shoot a monkey
Two objects in contact with one another and moving must use the action-reaction law.
Rocket propulsion involves the action-reaction law. The explosion from one end of the rocket causes a force in that direction. This causes an unbalanced force in the opposite direction causing the rocket to accelerate. Video Clip!