Today in intro physics, after introducing the new unit, we did test review using “sometimes, always, never,” which I learned from Frank Noschese. We have covered projectile motion, Newton’s 2nd Law, and Uniform Circular Motion.
Here were our statements:
- Constant speed means zero acceleration.
- Normal force points in the opposite direction of weight.
- When an object is on a ramp, the acceleration is always down the ramp.
- When a projectile hits a surface, it’s final velocity is zero.
- For an object in free-fall, its speed at maximum height is zero.
- In projectile motion,the horizontal component of acceleration is 9.8 m/s/s.
- For uniform circular motion, velocity and acceleration are 90 degrees apart.
- Given two velocity components, the speed is found by simply adding them together.
The rules are students must draw / describe two examples, no matter whether they think it’s always, sometimes, never.