Vocab 100 Any change in position over time is an example of ______________________. Motion
M.C. 100 What is an object that appears to stay in place that helps you detect motion in another object? a. a newton c. a lubricant b.a black hole d. a reference point D. Reference Point
Describe 100 Describe two differences between mass and weight. Mass is the amount of matter in an object, and weight is a measure of gravitational force experienced by the object. Mass is constant, while weight may change with location
CT & Graphs 100 List three ways of reducing friction in everyday life. Then list three examples of friction being helpful in everyday life. Sample Answers Reducing: 1. use oil to grease hinges 2. Soap to take rings off 3. use a cart to move heavy objects Helpful: 1. Brakes on cars 2. the static friction of your shoe on a bicycle pedal 3. Warm hands when cold
Vocab 200 The newton is the SI unit of ______________________. Force
M.C. 200 Which is an example of friction that is helpful? a.friction that causes engine parts to wear out b. friction between car tires and the road that moves a car forward c.friction that wears holes in your socks d. wind causing soil erosion b. friction between car tires and the road that moves a car forward
Describe 200 Describe how to determine average speed To determine average speed, divide the total distance by the total time taken to travel that distance.
CT & Graphs 200 Discuss how the gravitational force of Earth affects you. Include a description of how the gravitational force of the sun affects you as compared to how it affects Earth. The gravitational force between me and the Earth is large. The gravitational force of the sun affects me much less than it affects the Earth. The gravity between the sun and planets is large because the objects have large masses.
Vocab 300 The speed of an object in a particular direction is _____________________. Velocity
M.C. 300 To calculate an object’s acceleration, you need to know a. distance traveled and total time. b.starting point, endpoint, and the object’s mass. c.starting velocity, final velocity, and time it takes to change velocity. d. average speed and direction traveled. C. starting velocity, final velocity, and time it takes to change velocity.
Describe 300 Describe both speed and velocity, and state the difference between the two. Speed is distance over a period of time, and velocity is speed with direction. The difference between speed and velocity is that speed does not have direction, while velocity does have direction.
CT & Graphs 300 A student has a weight of 420 N on Earth. Assume that the moon’s gravitational force is exactly 1/6 the gravitational force on Earth. What would be the student’s weight in newtons on the moon? Explain your calculations. The student’s weight on the moon would be 70 N, which is 1/6 420 N.
Vocab 400 A force that always acts to oppose motion is ______________________. Friciton
M.C. 400 The force of gravity is greater between two objects that a.have greater masses. b.have rougher surfaces. c.are farther apart. d.are moving at greater speed a. Have greater masses.
Describe 400 Describe how unbalanced forces affect both moving objects and nonmoving objects. Unbalanced forces produce change in the motion of objects. In moving objects, unbalanced forces can change the motion. In non- moving objects, unbalanced forces can start motion.
CT & Graphs 400 Kyle achieved the greatest average speed during the interval between 5 minutes and 10 minutes. The distance traveled during this interval (2 km) was greater than the distance covered in any other 5-minute interval. During which 5- minute interval did Kyle achieve the greatest average speed?
Vocab 500 An object’s ______________________ can change with its location. Weight
M.C.500 Two forces act on an object. One force has a magnitude of 10 N and is directed toward the north. The other has a magnitude of 5 N directed toward the south. The object experiences a net force of a.5 N south. c.50 N north. b.15 N north.d.5 N north. d. 5 N north.
Describe 500 A hiker’s initial speed at the bottom of the hill is 1.8 m/s and 1.5 m/s when the hiker reaches the top. It took the hiker 180 s to climb the hill. Explain how to calculate the hiker’s acceleration, including whether it would be positive or negative. Subtract 1.8 m/s from 1.5 m/s. Divide that by the 180 seconds that it took the hiker to get to the top of the hill. We know the answer will be negative, because the final speed is slower than the initial speed.
CT & Graphs 500 Kyle probably stopped. He did not travel any distance in this interval. What may have happened in the time period between 10 and 15 minutes?