Formulas
What is the vf formula
vf=vo+at
The unit for force
Newton
What is Newton's third law?
Newton's third law states that the force that objects B exerts on A has equal magnitude but is directed opposite to the force that A exerts on B.
What is Newton's first law?
An object with no forces acting on it. If it is at rest, it will remain at rest. If it is moving, it will continue to move in a straight line at a constant speed.
How is power expressed?
Watts
What is the displacement formula
d=vot+1/2at^2
The equation for total (net) force
What is F = m*a?
What is the definition of a collision?
A short-duration interaction between two objects.
What is a net force?
The vector sum of all the forces.
List gravitational and kinetic energy formulas.
- Ug
-1/2mv^2
what is thermal energy
Eth=mewNd
Combined forces result in a zero net force on an object.
Balanced Forces
What is momentum
Product of the mass and velocity of the object. It has units of kg x m/s
Name 4 different types of forces
Weight
Spring
Tension
Normal
Name 3 types of energy
Gravitational
elastic
thermal
Kinetic
what is the formula for kinetic energy
k=1/2mv^2
As you ride your bike at 15m/s, you see a child ball roll in front of you. You press the brakes really hard and stop. You came to rest at 1.5s. How far does your car travel as you brake to a stop?
(you may need to use scratch paper )
-10 m/s =a
23.75 = d
Formula for momentum
p=mv
A steel beam hangs from a cable as a crane lifts the beam. What forces act on the beam?
Gravity and tension
What is the formula for elastic energy?
Usp=1/2kx^2-avg
The mass of an object that is traveling at the acceleration of 20m/s^2 and a force of 10,000N
What is the mass?
What is 500kg?
M= F/a = 10,000 / 20
M= 500kg
A force pushes the cart for 1s, starting from rest. To achieve the same speed with a force half as big, the force would need to push for....?
2s
A bobsledder pushes her sled across horizontal snow to get it going, then jumps in. After she jumps in, the sled gradually slows to a halt. What forces act on the sled just after she's jumped in?
Gravity, a normal force, and kinetic friction