 ## Practice Problems Speed Velocity And Acceleration-Free PDF

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According to the rules of algebra we can rewrite the formula v d t in. two different ways, If we want to know how far a car going at 55 miles hour travels in 3. hours we write d vt 55 miles hour 3 hours 165 miles. If we want to know how long it will take this car to cover a distance. of 220 miles we write t d v 220 miles 55 miles hour 4. The units such as miles and hours are always carried along in. calculations and are treated like ordinary algebraic quantities. The result of every measurement has two parts a number and a unit. The number is the answer to How many and the unit is the answer to. Of what Unitsare standard quantities such as a second a meter a. mile The most widely used units today are those of the international. system abbreviated SI Syst me International d Unit s Examples. of SI units are the meter m for length the second s for time and the. kilogram kg for mass, The speed of an object is a scalar quantity It just tells us how fast the. object is moving but not in which direction it is headed The vector. quantity which specifies both the speed and the direction is called. the velocity Notation speed v velocity v, Turza s Physical Science Semester Exam Review Part Two. Forces and Motion Speed Velocity and Acceleration,Speed Velocity Acceleration Force. Sample Problems, A girl travels 20 miles on her bicycle The trip takes 2 hours Express her speed in miles hr.
1 First we identify the variables in our problem,distance d 20 miles. time t 2 hours, 2 We place the variables in their correct position in the speed formula. S 20 mi 2 hour, 3 Perform the calculation and express the resulting speed value with the appropriate unit. S 10 mi hr, A car starts from a stoplight and is traveling with a velocity of 10 m sec east in 20 seconds What is the. acceleration of the car, 1 First we identify the information that we are given in the problem.
vf 10 m sec,vo 0 m sec,time 20 seconds, 2 Then we insert the given information into the acceleration formula. a 10 m sec 0 m sec 20 sec, 3 Solving the problem gives an acceleration value of 0 5 m sec 2. Now try on your own, 1 What is the speed of a rocket that travels 9000 meters in 12 12 seconds 742 57 m s. 2 What is the speed of a jet plane that travels 528 meters in 4 seconds 132 m s. 3 How long will your trip take in hours if you travel 350 km at an average speed of 80 km hr 4 38 h. 4 How far in meters will you travel in 3 minutes running at a rate of 6 m s 1 080 m. 5 A trip to Cape Canaveral Florida takes 10 hours The distance is 816 km Calculate. the average speed 81 6 km h, 6 How many seconds will it take for a satellite to travel 450 km at a rate of 120 m s 3 750 s. 7 What is the speed of a walking person in m s if the person travels 1000 m in 20 minutes 0 80 m s. 8 A ball rolls down a ramp for 15 seconds If the initial velocity of the ball was 0 8 m sec and the. final velocity was 7 m sec what was the acceleration of the ball 0 413 m s. 9 A meteoroid changed velocity from 1 0 km s to 1 8 km s in 0 03 seconds What is the acceleration of. the meteoroid 26 7 km s, 10 A car going 50mph accelerates to pass a truck Five seconds later the car is going 80mph Calculate.
the acceleration of the car 6 mph s, 11 The space shuttle releases a space telescope into orbit around the earth The telescope goes from. being stationary to traveling at a speed of 1700 m s in 25 seconds What is the acceleration of. the satellite 68 m s, 12 A ball is rolled at a velocity of 12 m sec After 36 seconds it comes to a stop What is the. acceleration of the ball 0 33 m s, 13 How much force is needed to accelerate a truck with a mass of 2 000 kg at a rate of 3 m s 6 000 N. 14 A dragster in a race accelerated from stop to 60 m s by the time it reached the finish line The. dragster moved in a straight line and traveled from the starting line to the finish line in 8 0. sec What was the acceleration of the dragster 7 5 m s. 15 A 300 N force acts on a 25 kg object The acceleration of the object is 12 m s. Question 31,Back to Top, Question A certain force exerted for 1 2 seconds raises the speed of an object from 1 8 m s to 4 2 m s Later. the same force is applied for 2 seconds How much does the velocity change in 2 seconds. Answer Initial velocity u 1 8 m s,Final velocity v 4 2 m s.
Time t 1 2 seconds,First calculate acceleration, As the same force acts for the next two seconds the acceleration produced will be the same The final velocity in. the first case will now become the initial velocity We have to calculate the final velocity at end of 2 seconds. Acceleration a 2 m s2,Intial velocity u 4 2 m s t 2 s. Final velocity v,First equation of motion,Change in velocity in two seconds 8 2 4 2 4 m s. Question 32,Back to Top, Question Two blocks made of different metals identical in shape and size are acted upon by equal forces. which cause them to slide on a horizontal surface The acceleration of the second block is found to be 5 times that. of the first What is the ratio of the mass of second block to that of the first. Answer Let m1 and m2 be the mass of the first and second block respectively and a be the acceleration. Question 33,Back to Top, Question Brakes are applied on a car of mass 1000 kg moving with a velocity of 54 km h The car covers a.
distance of 50 m before coming to rest Calculate the force applied on the car. Answer Initial velocity u 54 km h, Final velocity v 0 because the car is brought to rest. Distance covered S 50 m, We have to calculate force applied i e F ma But we do not know the value of a Making use of III equation of. motion we get,Mass 1000 kg,Force 1000 x 2 25,Retarding force 2250 N. Question 34,Back to Top, Question A car of mass 800 kg moving at 108 km h is brought to rest over a distance of 15 m Find the. retarding force developed by the brakes of the car. Answer Initial velocity u 108 km hr,Final velocity v 0.
Distance covered S 15 m,III equation of motion Applying v2 u2 2aS. Mass of the car 800 kg,Retarding force 24000 N,Question 35. Back to Top, Question The velocity of a car of mass 1800 kg increases by 90 km h in 15 seconds Calculate the force. applied to increase the speed,Answer Mass of the car m 1800 kg. Force applied ma,Time t 15 seconds,Question 36,Back to Top.