SCORE MORE HESI A2 (Physics ) CURRENTLY TESTING REAL EXAM VERSIONS 200+ QUESTIONS| VERIFIED ANSWERS FOR GUARANTEED PASS | LATEST UPDATE | 2024 -2025 average speed formula Vav= distance/time A car travels 3,200m in 25mins. What's the average speed of the car? A. 2.67 m/s B. 2.13 m/s C.88 m/s D. 160 m/s B Convert into seconds first x/25mins=60s/1min; 25 x 60= 1500/1 3200/1500= 2.13 m/s Velocity Speed in a given direction scalar quantity Vector quantity SCORE MORE S: described by numeric value, expressed in units of magnitude V: describe time rate of change by object position, expressed in magnitude & direction average velocity formula Final velocity + initial velocity / 2 Acceleration Formula change in velocity over time Formula: final velocity - initial velocity / time Acceleration problem A wagons set in motion. The wagon has an initial speed of 20 m/s and moves for 35 seconds. At the end of the 35 seconds, the wagon's speed is 50 m/s. Wha t's the magnitude of the wagons acceleration? A. 0.3 m/s B. 0.86 m/s C. 1.37 m/s D. 2.4 m/s B projectile motion When an object is thrown, launched, or otherwise projected near the surface of Earth SCORE MORE Horizontal motion of a projectile Formula Not accelerat ed motion Formula: dx= velocity x time Vertical motion of a projectile The three formulas Accelerated motion 1. Vf^2= Vi^2 + 2ad 2. D= 1/2at^2 + Vi x T 3. Vf= Vi + at A= 9.8 always A ball is kicked off a cliff that is 23.7 m tall. The horizontal speed given to the ball is 14.0 m/s. Assuming there is no air resistance, how far out from the base of the cliff will the ball land? Figure out what you have first 30.8 A= 9.8 always Didn't f all yet, Vi=0 First: use d=1/2at^2 + Vi x t Then, d=1/2at^2 b/c vi is 0 Get t by itself, divide 1/2a, flip to top get 2d/a=t^2 3. Solve for time: t= square root d x 2 / a Then, square root 23.7 x .8 T= 2 Next Dx= Vt SCORE MORE Dx= 14.0 m/s x 2.2s Dx= 30.8 m Force A push or a pull Newton's First Law Formula an object at rest will stay at rest, an object in motion will stay in motion unless acted on an unbalanced force Formula: f= ka (constant proportionality times acceleration) Newton's Second Law F=ma (mass times acceleration) net force The sum of all forces acting on an object + and - signs for directions Formula : nf= F left + ( -) F right A book rests on a tabletop. The book has a mass of 4 kg and is acted on by 2 forces. The force pushing to the right is 56 N and the left is 145 N. Determine the magnitude of the acceleration of the book, assuming there is no friction btn the book and table. A. 12.5 m/s B. 22.3 m/s
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