Energy & Density
What is the formula for density?
Density = mass/volume
In a speed vs. time graph, what does a horizontal line represent?
Constant speed
Which law states for every action or force, there is an equal and opposite reaction or force?
Newton's Law of Action-Reaction (3rd)
What is the formula for calculating force?
F = m x a
What is the speed of a car that travels 10 miles in 10 minutes?
1 mile/minute
What is the energy of a moving object?
Kinetic Energy
A change in velocity is called....
Acceleration
Which law explains why an object with a mass of 5 kg accelerates more than an object with a mass of 10 kg when a force of 7 N is applied to it?
Newton's Law of Acceleration
A stapler sitting on the teacher's desk is an example of which type of force: balanced or unbalanced?
Balanced
What is the acceleration of a 2 gram ping pong ball hit with a force of 20 N?
10 m/s2
What is the energy an object has because of its position?
Potential energy
A geese travels 500 miles in 2 days toward Texas is an example of....
Velocity
Why does a bowling ball accelerate less than a basketball when a force is applied?
It has more mass
A box travels across the wood floor at a rate of 10 m/s2. When it hits the carpet, the acceleration slow to 4 m/s2. What happened?
A. the carpet applied a balanced force causing it to slow
B. The carpet applied an unbalanced force causing it to slow
B. The carpet applied an unbalanced force causing it to slow
A car traveled 75 km/hr for 6 hours. How far did the car travel?
450 km
Answer both questions in order.
Energy of moving electrons?
Energy stored in fuel?
Electrical
Chemical
If an object travels at a constant speed in a circular motion, how would you describe the motion of the object?
Accelerating
Which 2 laws explain why a rocket ship can launch from Earth?
Newton's 3rd- fuel pushes downward while the Earth pushes upward
Newton's 1st- the Earth has more inertia than the rocket, so the rocket moves upward
Which type of force causes a change in motion?
Unbalanced
A gold nugget has a mass of 193 grams and a volume of 10 cm3. What is the density of the gold nugget?
19.3 g/cm3
Calculate the density of an object that has a mass of 16.76 kg and a volume of 2 cm3.
8.38 g/cm3
Below describes the motion of a car:
Minute 1: 35 mph north
Minute 2: 30 mph north
Minute 3: 40 mph north
Minute 4: 38 mph north
What statement about the cars motion is true?
A. Its speed changed but velocity did not.
B. Its velocity changed but speed did not.
C. Its speed and velocity changed.
C. Its speed and velocity changed.
Which of Newton's Laws best explains why the moon orbits the Earth?
Newton's 1st Law- the law of inertia states that an object in motion will stay that way until a force acts on it.
What causes a car to turn left (answer in terms of force)?
An unbalanced force is applied to the car causing it to turn
An object has a mass of 179 kg. It accelerates at a rate of 35 m/s2. What force was applied to the object?
6,265 N