Motion and Energy Motion

position, motion A _______________ is the location of an object. A change in the position of an object over time is ___________.

distance, direction 2. Motion has two parts: ___________________ and __________________.

meters (m), kilometers (km), feet (ft), or miles (mi) 3. Distance can be measured in _______________( ), _______________________( ), ____________________ ( ), or ________________________________( ).

compass ,protractor 4. To measure direction, you can use a _____________________ or a ___________________ and units of degrees.

frame of reference 5. Positions and motions only make sense if you have a _____________ ____ ________________. A frame of reference is a group of objects from which you measure a position or the motion. Almost anything can be a frame of reference and frames of reference can move.

speed, divide, time 6. ______________________ is how fast an object’s position changes over time. To calculate speed, you _________________ the distance traveled by the ________________ spent traveling.

meters, kilometers, miles 7. Units of speed are units of distance per unit of time, such as _______________ per second (m/s)., __________________ per hour (km/h), or _________________ per hour (mph.)

velocity, speed, direction 8. ___________________ is the measurement that combines both ______________ and __________________ of a moving object.

acceleration 9. ____________________ is the change in velocity over time of an object. Since units of velocity include speed and direction, if either of those changes, the object is considered to be accelerating.

5 (m/s/s) south If the speed of a car traveling south is increasing 5 m/s every second, its acceleration is _____________________.

negative, decelerates 10. Acceleration for a decreasing speed is given as a ________________ number. We could also say it ______________________. .

momentum 11. When you change mass or velocity, you also change ___________________.

Momentum = mass x velocity mass, velocity 12. Momentum is the product of ___________ multiplied by _______________. Momentum = mass x velocity _________ = 1 kg x 10 m/s

kilogram, gram 13. Units of momentum are equal to units of mass times unit s of velocity, most often ___________________ meters per second (kg m/s) or ________________ meters per second (g m/s). Bucket filled with sand is more difficult to be moved. It's also more difficult to be stopped from swinging.

inertia, momentum 14. When you want to change an object’s velocity, you have to overcome its ___________________. The more inertia something has, the harder it is to change its _________________.