Science Vocab and Questions: Ch 19 Flashcards
The speed and direction of a moving objects is it’s
velocity
The distance an object an object travels in a certain amount of time is it’s
speed
The rate of change of velocity over time is
Acceleration
The tendency of an object to maintain its state of motion is
inertia
when a boy lands on a trampoline.what is the reaction force?
The boy pushing down
The diagram shows a force acting on an object. what is the direction of the objects accelation?
Opposite to the force
What force helps you stop when you’re skateboarding?
friction
A worm crawls 2 meters in 2 hours. What is the worm’s speed?
1m/hr
which of the following is NOT part of Newton’s second law?
position
A girl ice-skates in a circle at a constant speed of 10km/hr. What part of her motion is changing?
Velocity
Which of the following DOES NOT cause a car to accelerate?
brakes
If you were a bicycle racer, what feature would you use for in a bike?
low mass
A balloon rises at a rate of 2 km/hr. What is its velocity?
2 km/hr, upward
If you walk on a log floating in water, the log moves backward. Which of the following explains this?
Newton’s third law
A truck, a car, a motorcycle, and a train are all moving at the same speed. Which has the most momentum?
A truck