Forces 1
A force that opposes motion
Friction
What force is caused by gravity acting on a mass
Weight
Thrust on a car is 600N. Resistive Forces are 400 N
What is the Resultant Force ?
200N
What type of force is used to stop a car?
Friction.
F= ma - whose Second Law is this? (DOUBLE)
Isaac Newton
What force keeps the Earth in orbit?
Gravity
A thrust force of 500N acts on a 1000kg car. What is the acceleration?
0.5 m/s2
Engine force of a car is 1000N.
Friction is 200N
What is the Resultant force?
800N
Force that acts on a string?
tension
Define the term non-contact force.
A force that causes an effect without physical contact.
M = F/A
What are the three forces that act upon a car rolling to a stop?
Gravity, Friction, and Air Resistance.
If a 30N force is angled at 40 degrees southeast, what is the magnitude of the east force?
30*cos(40) = 22.98N
If an object has a force of 1 Newton pushing left, and 1.5 Newton pushing right, is the force balanced or unbalanced?
Unbalanced.
Define the term contact force.
A force that causes an effect through physical contact.
What is the rate of change of velocity?
Acceleration
What is the force that opposes gravity when a book is resting on a table?
The Normal Force.
What's the weight of a 90kg man?
Every Action has an equal and opposite reaction
What is Newtons 3rd Law
What type of force is equal in magnitude and opposite in direction?
A Balanced Force.
What is Newton's First Law?
The Law of Inertia.
An object in motion will remain in motion, and an object at rest will remain at rest, until acted upon by a force.
If a 5N force is angled at 30 degrees northeast, what is the magnitude of the north force?
5*sin(30) = 2.5N
Four contact forces
Friction
Air resistance
Tension
Normal contact
A train is moving with a force of 62,000N and accelerating at 2.5 m/s2. What is its mass?
24,800 kg
A rocket with a mass of 75,000 kg is moving through the atmosphere with a force of 89,000 N. What is its acceleration?
1.19 m/s2