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ch. 18/19


What is the distance an object travels in a certain time called? speed
What is the tendency of an object to resist a change called? inertia
What is the distance an object travels in a certain direction in a certain time called? velocity
What is the rate at which an object's velocity changes called? acceleration
If a heavy ball and a light ball are rolling at the same speed on the same surface, why will the heavy ball be harder to stop? momentum
A marble rolls steadily at a speed of 1m/sec in one direction for 2 minutes. What property of the marble changes? position
If the same force acts on a baseball, a golf ball, a football, and a soccer ball, which will have the greatest acceleration? a golf ball
If there are 2 cars, car A is 10 g and moves 1m/sec and car B weighs 15g and moves 1m/sec, what is the same with the 2 cars? speed
Chris jumps up and puts a basketball in the basket. What object pushes against Chris so he can jump? floor
A car is stopped at a red light. The light turns green and the car starts accelerating 10km/hr every second. What will its speed be at the end of 3 seconds? 30 km/hr
As you walk, your feet push against the ground. At the same time, the ground pushes against your feet. Which explains this? Newton's 3rd law
A train is traveling on a curved track at a constant speed. Why is the train accelerating? its direction varies
Which can you probably pick up an apple, a bicycle, a car, or an elephant with exerting of just 1 Newton Force? apple
Why do astronauts float while they are in orbit? no gravity
Suppose you are watching a football game from a seat near the top of the stadium. Which best describes your position and all the things around you? frame of reference
A push or pull that causes motion is called? forces
A force that opposes motion is called what? friction
What is the force of attraction between all objects called? gravity
A wheel with a groove for a rope is called a what? pulley
A bar that makes it easier to move things is called what? lever
What is a ramp or sloping surface called incline plane
A device made of only a few parts that makes work easier is called what? simple machine
The balance point of a lever is called a what? fulcrum
What is the purpose of a simple machine? make work easier
If a batter hits a baseball, sending it soaring in the air, what term best describes the forces of the moving ball? unbalanced
Two arm wrestlers exert a force on each other's hands, the hands don't move, what is the term for this force? balance
Two boys push on a box, to the left. They each apply a force of 50N. At the same time, a third boy pushes on the box, to the right using a force of 50N. What is the net force on the box? 50N to the left
What type of machine are a wedge, a chisel, and an axe? incoplaine
What force operates when you use a bar magnet to pick up paper clips? magnet
Created by: woods1