Physics Word Problems Practice: Motion

PHYSICS WORD PROBLEMS PRACTICE: MOTION SECOND TRIMESTER, 2010

Directions: Use the problem solving steps to solve for the word problems below.

1. Calculate the displacement in meters a cyclist would travel in 5.00 h at an average velocity of 12.0 km/h to the southwest. V=d/t d= 12,0 km/h * 5h The displacement is 60 km SW d= v*t = 60 km SW v= 12,0 km/h SW t= 5h

2. How much time does it take for a student running at an average speed of 5.00 m/s to cover a distance of 2.00 km? V=d/t t= 2000m / 5m/s The time is 400s. t= d/v = 400 s v= 5m/s d= 2km→2000m

3. Find the average acceleration of a northbound subway train that slows down from 12 m/s to 9.6 m/s in 0.8 s.

2 A= Vf- Vi A= 9,6m/s - 12m/s The acceleration is -3m/s N t 0,8 s t= 0,8s = -3m/s2

Vi=12m/s

Vf= 9,6m/s

4. Marisa’s car accelerates at an average rate of 2.6 m/s2. Calculate how long it takes her car to speed up from 24.6 m/s to 26.8 m/s.

A= Vf- Vi t= 26,8m/s – 24,6m/s The time is 0.85s t 2,6 m/s2 =0,85s t= Vf- Vi A t= ?

Vi=24,6m/s

Vf= 26,8m/s

A= 2,6 m/s2 5. A cyclist travels at a constant velocity of 4.5 m/s westward, and then speeds up with a steady acceleration of 2.3 m/s2. Calculate the cyclist’s speed after accelerating for 5.0s.

2 A= Vf- Vi Vf= 4,5m/s + 2,3 m/s *5 s t =16 m/s west Vf =Vi + A*t t= 5 s The final velocity is 16 m/s west

Vi=4,5m/s

Vf= ???

A= 2,3 m/s2