Physics Exam Review Questions and Answers 2024

What are the steps of the scientific method? - 1. Make an observation/ask a question 2. Form a hypothesis 3. Design and perform an experiment 4. Analyze Data 5. Form conclusion What are Newton's 3 laws of motion? - 1. Law of inertia 2. F=ma 3. For every action there is an equal and opposite reaction What is the net force on a cart pulled with 70 lbs of force to the left and 20 lbs of force to the right? - 50 lbs to the left What does it mean to say something is in mechanical equilibrium? - The sum of all the forces on a object are 0 When you stand at rest on a bathroom scale, how does your weight compare to the support force provided by the scale? - It is equal An object at rest is in equilibrium. Is that same object in equilibrium if it is moving in a straightline path at a constant speed? - Yes Two people each pull with 700 N of force in a tug of war. What is the net force on the rope? How much force is exerted on each person by the rope? - Net force=0, 700 N on each person What 2 units of measure are required to measure speed? - Distance and time How far does a horse travel if it gallops at a speed of 25 km/h in a time of 30 min? - 12.5 km Distinguish between speed and velocity. - Speed is how fast and velocity is how fact and in what direction What is the acceleration of a car that increases its speed 100 km/h in a time of 10s? - 10 km/h/s What exactly is meant by a freely falling object? - The only force acting on an object is gravity. How fast is an object in a free fall moving after 5 seconds of fall? - 50 m/s How far would an object in a free fall have gone if it had fallen for 5 sec? - 125 m Consider these measurements 10 m, 10 m/s, and 10 m/s2. Which of these is a measure of acceleration which of distance and which of speed? - 10 m=distance, 10 m/s=speed, 10 m/s2=acceleration Harry Hotshot can paddle a canoe in still water at 8 km/h. How successful will he be at paddling up stream in a stream moving at 8 km/h? - He will be sitting still/not moving A ball is thrown straight up at a speed of 30 m/s. How high does it go? How long is it in the air? - 45 m up in the air for 6 sec Someone standing on the edge of a cliff throws a ball straight up and one down at the same velocity. Which will have the greater speed when it strikes the ground? - Neithe