1. Topic: Newton’s 3rd Law and Momentum
Day
Topic: Newton’s 3rd Law and Momentum
Objective: I will learn to distinguish the difference between action/reaction and Momentum

2. Science Starter

4. Momentum m v p stands for momentum p Units for momentum kg·m/s
m stand for mass (kg)
v stands for velocity (m/s) p m v

5. Momentum Summary What is the definition of Momentum?
The mass of an object multiplied by its speed or velocity.
2. Write down the equation for momentum.
P=mv
Write down the other 2 forms of the momentum equation.
m=p/v and v=p/m
4. Write down the units of momentum.
Kg·m/s

6. Do the following problems in your notebook (p.81)
1. You throw a basketball by exerting a force of 20 newtons. According
to Newton’s third law, there is another 20-newton force created in the
opposite direction. If there are two equal forces in opposite directions,
how does the ball accelerate?
2. What is the momentum of a 2-kg ball traveling at 4 m/sec?
3. How fast does a 1000 kg car have to move to have a momentum of
50,000 kg-m/sec?
4. Lilly’s momentum is 110 kg-m/sec when she walks at 2 m/sec. What’s
her mass?
5. Which has more momentum: a 5000-kg truck moving at 10 m/sec or a
sports car with a mass of 1200 kg moving at 50 m/sec?