States the Law of conservation of energy

Energy cannot be created or destroyed; it can only be transformed from one form to another, but the total energy of an isolated system remains constant.

An automobile travels 3,200 kilometres in 75.0 hours. What is the average speed in: a. Kilometers per hour? _____________________ b. Meters per second? _____________________

Distance = 3,200 km Time = 75.0 hours a. Average speed= Time/Distance v=3200 km/75.0 h v=42.67 km/h b. 3200 km = 3,200,000 m 75.0 h × 3600s/h =270,000 s v=3,200,000m/270,000s v≈11.85m/s

A chariot with a mass of 800 kg starts from rest and reaches a speed of 36 m/s in 12 seconds. Find: a. The acceleration of the chariot: ___________________ b. The net force applied to the chariot: ___________________

Mass m=800 kg Initial speed u = 0 m (starts from rest) Final speed v=36 m/s v = 36m/s Time t=12 s a. a= v-u/t a=36-0/12=3m/s 2 b. F=m×a F=800×3=2400N Net Force: F=2400 N

A body falls freely for 13.0 seconds. Given that g=9.81m/sec 2 , calculate the: a. Final velocity _____________________ b. Average velocity _____________________ c. Distance the object falls _____________________

Time: t=13.0 s Acceleration due to gravity: g=9.81 m/s² Initial velocity: u=0 m (free fall) a. v=u+gt v=0+(9.81)(13.0) v≈127.53 m/s b. vavg=u+v vavg=0+127.53/2 ≈ 63.77 m/s c. s=vavg×t s=63.77×13.0≈829.0 m or s=ut+1/2gt 2 : s=0+1/2(9.81)(13.0) 2 s = 0 + \frac{1}{2} (9.81)(13.0)^2 s=0+21(9.81)(13.0)2 s=0.5×9.81×169 ≈828.6 m

PHYSICS Flashcards

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42 questions

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1.

FLASHCARD QUESTION

Front

The study of the causes for change in motion.

Back

dynamics

2.

FLASHCARD QUESTION

Front

The mathematical description of motion.

Back

kinematics

3.

FLASHCARD QUESTION

Front

Any influence capable of producing a change in the velocity of a body.

Back

force

4.

FLASHCARD QUESTION

Front

The product of force and the distance through which the force is applied.

Back

work

5.

FLASHCARD QUESTION

Front

Motion around a fixed axis.

Back

rotation

6.

FLASHCARD QUESTION

Front

A single vector that is the sum of two or more vectors.

Back

resultant vector

7.

FLASHCARD QUESTION

Front

Relies on experimentation rather than observation alone.

Back

experimental science

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