Brain Pop #5
What is kinetic energy?
The energy an object has due to its motion
What is potential energy?
The energy an object has due to its position or condition.
What is kinetic energy?
The energy that an object has due to its motion.
What can you infer about an object moving at a constant velocity?
The forces acting on it are in balance
If the net force on an object is zero, what can you conclude?
The object is not accelerating
What is potential energy?
The stored energy of an object due to its position or condition.
According to Newton's third law, what happens when you push against a wall?
The wall pushes back at you with the same amount of force.
There is a finite amount of energy in the universe. What does this mean?
There is a limited amount of energy in the universe.
What is true of non-contact forces?
They become weaker with distance
Ordinarily, gravity and the normal force counterbalance each other. In other words:
They cancel each other out
What is true about all forces?
They involve more than one object
What do potential and kinetic energy have in common?
They're both related to motion.
If distance = rate x time, which of the following must also be true?
Time = distance/rate
Acceleration occurs when an object is subjected to a(n):
Unbalanced force
Which of the following statements is always true?
Unbalanced forces lead to a change in speed or direction
When is potential energy transformed into kinetic energy?
When an object at rest is put into motion.
When does a yo-yo have the most potential energy?
When it's at its highest point.
When does an object have no kinetic energy?
When it's at rest.
When is kinetic energy transferred from object to object?
When those objects collide
Which of these has the most potential energy?
(a car at the top of a hill)
What part(s) of a moving car experience the most friction? Choose the best answer.
(it's tires)
Which one of these arrows best corresponds to the force of drag?
(picture is answer)
If a jogger runs a 10-kilometer race in 60 minutes, what is her average speed?
10 km/hr
A crosstown bus travels 8 kilometers in 45 minutes. What is its average rate of speed?
10.67 km/hr
If a train travels 1,600 km in 16 hours, how fast is it moving?
100 km/hr
An aircraft carrier travels a distance of 1,000 km in 3 days. What is its average rate of speed?
13.9 km/hr
If a car travels at 40 km/hr for 4 hours, how much distance has it covered?
160 km
If a person ran 32 kilometers at a rate of 8 kilometers/hr, how long did he run?
4 hours
A train leaves New York traveling at a speed of 90 km/hr. How much distance will it cover in five hours?
450 km
If a train travels at a speed of 100 km/hr, how far will it travel in half an hour?
50 km
Which object has the most potential energy?
A ball resting on the edge of a cliff.
Which of the following has the most kinetic energy?
A tractor-trailer traveling at 80 kph.
According to Newton's first law, an object in motion will stay in motion unless:
An opposing force acts on it.
In a generator, kinetic energy is transformed into:
Electricity
Kinetic and potential energy are the two types of energy that relate to:
Motion
Why do objects at high elevations have more potential energy than objects at low elevations?
Because gravity gives objects at high elevations the potential to fall much further
Which passenger has the most potential energy?
D
What is net force?
The combined forces acting on a particular object
Which two components must a vector quantity have?
Direction and magnitude
If you drop an egg off of the Empire State Building, which of the following things will happen first? answer a Drag will increase correct
Drag will increase
Which of the following steps is important in solving distance, rate, and time problems?
Drawing diagrams
What causes a ball rolling across a rug to slow to a stop?
Friction resists the ball's forward motion.
Which of the following is an opinion about friction?
It slows objects down too much
If an unbalanced force acts on an object, what will happen?
It will accelerate in the same direction as the force.
The amount of kinetic energy an object has depends on its:
Mass and speed.
What does the measurement unit N stand for?
Newton
Four cars are positioned at the top of a hill. Which car has the most potential energy?
Picture is answer
What will happen if you're in a car, and the driver slams on the brake?
You will continue moving forward.
What might happen if you were in a braking car, and you weren't wearing your seat belt?
You'd fly forward through the windshield.
Which is the best synonym for potential energy?
stored energy