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Transcript
Chapter 11.3 Newtons rd 3 law Newton’s Laws • 1. An object in motion or rest remains the same unless acted on by a force. • 2. Force= mass x acceleration. The amount of force needed to move an object is equal to the amount of mass in the object and how much you want to accelerate it. • 3. For every action there is an = and opposite reaction Newton’s 3rd Law • If you push on an object, gravity and friction pull back on it. The forces act in pairs but always in opposite directions • Forces do not act on the same object rd 3 law continued • The forces may be happening at the same time but may not have equal effects. Example a bouncing ball never rebounds as high as tossed down. • Action/reaction is everywhere. Momentum • Momentum is how fast an object moves due to its mass. • A semi has more momentum than a Vw bug. • To have momentum you must be moving Momentum con’t • Formula for momentum • p=mv (p stands for momentum, m stands for mass, and v stands for velocity • It takes force to change Momentum Momentum con’t • Momentum is conserved or saved. It is always transferred. EX: You can transfer it to heat in friction when you brake or you can push a car forward when you hit it.
