PHY 102 Final Exam ISU Part 1 Questions and Answers

basic research Answer- is driven purely by curiosity applied research Answer- aimed to improve the human condition and is driven purely by curiosity motion Answer- mechanics deals with the study of meter Answer- SI unit for length kilogram Answer- According to SI units, mass of substance is measured in False Answer- True or False: If an object is slowing down, then its acceleration is in the same direction of its motion. meter/second Answer- SI unit for velocity France Answer- In what country was the metric system originally developed? 7 Answer- How many base units comprise the SI? scaler quantity Answer- A quantity that has only magnitude vector quantity Answer- a quantity that has both magnitude and direction 40 mph Answer- A freight train travels a distance of 160 miles in 4 hours. What is the average speed of the train? instantaneous speed Answer- speedometer of a car reads... 0 Answer- What is the acceleration of a car that travels in a straight line at a constant speed 20 m/s? speed is scaler quantity and velocity is vector quantity Answer- The difference between speed and velocity is velocity Answer- What does slope of a position vs. time graph represent? Acceleration Answer- What does slope of a Velocity vs. time graph represent? both at same time Answer- If a feather and an iron bar is released from a same height in a room without any air resistance. Which will fall first? William Lawrence Bragg Answer- Youngest Nobel laureate in Physics is pie graph Answer- Which type of graph represents size relationship between parts and the whole? y=2x+5 Answer- Equation of a straight line with slope 2 and y-intercept 5 is 9.8 ms-2 Answer- Gravitational force of earth is weight Answer- What Changes with location? The moon's gravitational pull is weaker Answer- We can jump higher on the moon than on earth because Newton Answer- SI unit of force parabola Answer- The path of a projectile is a False Answer- True or False: An object dropped from rest is not a projectile (provided that the influence of air resistance is negligible). inertia, gravity Answer- A projectile is an object that once projected or dropped continues in motion by its own __________ and is influenced only by the downward force of __________ 0 m/s Answer- A stone is dropped from a cliff. Its initial velocity is - 9.8 m/s Answer- A ball with a mass of 0.5 kg is thrown vertically upward with a speed of 19.6 m/s. What is its velocity after three seconds? 73.1 m/s Answer- A projectile is projected with an initial velocity 75.7 m/s at an angle 15 degree above the horizontal. What is the horizontal component of the initial velocity of the projectile? vector quantity Answer- force is a static friction Answer- The friction force that acts on objects that are at rest is repel or attract Answer- A main difference between gravitational and electric forces is that electrical forces friction Answer- The force that always acts opposite to the direction of the motion of an object is called Newton's Third Law Answer- If you blow up a balloon, and then release it, the balloon will fly away. This is an illustration of its mass Answer- The acceleration of an object is inversely proportional to the net force acting on it Answer- The acceleration of an object is proportional to move with constant velocity Answer- According to Newton's first law, In the absence of an external force, a moving object will The box will move toward you with a force of 10 N Answer- If you are pushing a box toward your friend with a force of 20 N, and your friend is pushing the box toward you with a force of 30 N, what will happen to the box? force would be the same Answer- A bug with a mass of 5 grams flies into the windshield of a moving 1000kg bus. Which will have the most force? Newton's First Law Answer- Which law explains why we need to wear seatbelts? 5000 N Answer- Lilly has a car that accelerates at 5 m/s2 . If the car has a mass of 1000 kg, how much force does the car produce? M/4 Answer- A force accelerates an object of mass M. The same force applied to a second object produces 4 times the acceleration. What is the mass of the second object? torque Answer- the tendency of a force to cause rotation the turning effect of a force the product of force and moment arm 100 Nm Answer- What is the torque if a 50 N force is applied 2 m from the axis of rotation?