# PS.10 a - Speed, Velocity, & Acceleration

The student will investigate and understand the scientific principles of work, force, and motion. Key concepts include
a) speed, velocity, and acceleration.

Bloom's Levels:  Analyze; Understand

### BIG IDEAS

• Motion is a key characteristic of all matter that can be observed, described, and measured.
• Energy change can be understood in terms of forces- pushes or pulls.

• I can determine how fast a car is moving.
• I can explain why, when two objects collide, they often bounce backwards.
• I can explain why simple machines, such as a ramp (inclined plane), are useful.
• I can design a roller coaster

### UNDERSTANDING THE STANDARD

• Acceleration is the change in velocity per unit of time. An object moving with constant velocity has no acceleration. A decrease in velocity is negative acceleration or deceleration. A distance-time graph for acceleration is always a curve. Objects moving with circular motion are constantly accelerating because direction (and hence velocity) is constantly changing.

### ESSENTIALS

In order to meet this standard, it is expected that students will

a) make measurements to calculate the speed of a moving object.

apply the concepts of speed, velocity, and acceleration when describing motion.

a-d) differentiate between mass and weight.

### KEY VOCABULARY

speed, velocity, acceleration, Newton's Laws of Motion, work, force, mechanical advantage, efficiency, power, mass, weight, simple machines, compound machine

Updated: Jun 29, 2018