A
A snowboarder has these three forces acting on it:
Weight, normal and friction forces
What is the equation that represents Newton's 2nd Law?
F=m x a
In KE = 1/2m v2. If Velocity doubles, by how much doee KE increase.
KE quadruples.
A rollercoaster has 500 Joules of GPE at the top of the first hill, when it is not moving. How much KE will it have at the bottom when its height is ZERO?
500 Joules
Amount of matter in an object is called ______ . Does it change when the object moves uphill?
mass, no
What is Newton's THIRD law?
For every force, there is an equal and opposite force.
A person is pulling on a box with a force of 100 Newtons and friction is slowing down the box with a force of 20 Newtons. If the box has a mass of 10kg, what is its acceleration?
8 m/s2
Thermal, electrical, and sound energy all have partciles moving. Therefore all three types of energy are examples of what type of energy?
Kinetic
Potential Energy is _______ energy, and KE is the energy of _______.
stored, motion
In F = ma, Force and acceleration are ______ proportional.
directly
This type of force is present when we have an object hanging by a rope or a cable from the ceiling.
Tension and Weight force
If F (net) = F1 + F2 and the forces are acting in opposite directions than one of the forces will be _______
negative
If an object is moving, the forces that are acting on it are balanced or unbalanced or balanced.
unbalanced
An object has a mass of 7 kg and is at a height of 2 meters on a planet with gravitational acceleration 10m/s2. How much GPE does it have?
140 J
A ball hits the wall with the force of 40N. What's the force with which the wall hits the ball?
40N
Gravitational Force is often referred to as _______ force when it has to do with a planet and an object.
Weight
The mass of an object is 50 kg. How much WEIGHT does this object have if W = mg (g = 5m/s2).
Is the planet the object is on more or less massive than Earth?
250 N, less
A football field is about 100 meters. How many centimeters is a football field?
10,000 cm
Temperature is a measure of the average kinetic energy of all the moving particles in a substance. We call it 'heat', but its scientific name is ______ energy.
Thermal
The reason a 25kg Jose falls down after colliding with a 35kg Maria is because his acceleration is greater while their forces are ______.
equal
Newton's first law, an object in motion stays in motion and an object at rest stays at rest. According to that law, an elephant has greater ______ than a cat because of its mass.
Inertia
A car's engine puts out a maximum force of 10,000 Newtons. If the mass of the car is 1,500 kg, how fast will the car accelerate?
6.67 m/s2
An object that has KE is in _______. And an elevated object has ______ energy
motion, potential
An object has a GPE of 1000 J. This object is 10 meters off the ground. On a planet with gravitational acceleration of 5m/s2. How much mass does this object have?
20 kg
Normal force acts parallel to the surface: True or False?
False. Normal force acts perpendicular to the surface.