Forces 1
A force that opposes motion in the opposite direction
Friction
What is Newton's 1st Law of motion?
An object at rest remains at rest, and an object in motion remains in motion unless acted on by an outside force.
Define the term contact force.
A force that causes an effect through physical contact.
What type of force is used to stop a car?
Friction.
F= ma - whose Second Law is this?
Isaac Newton
What force keeps the Earth in orbit?
Gravity
What is Newton's 2nd Law of motion?
The acceleration of an object depends on the mass of the object and the amount of force applied.
Define the term non-contact force.
A force that causes an effect without physical contact.
A thrust force of 500N acts on a 1000kg car. What is the acceleration?
0.5 m/s2
What law states, "every particle in the universe attracts every other particle with a force directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers "
Law of Gravity
M = F/A
What is another name for Newton's 1st Law of Motion?
Inertia
What type of force is equal in magnitude and opposite in direction?
A Balanced Force.
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
What law states, "Momentum is never created or destroyed, only transferred; the total momentum before an action equals the total momentum after."
Law of momentum
What is the force that opposes gravity when a book is resting on a table?
The Normal Force.
What is another name for Newton's 2nd Law of Motion?
Law of Acceleration
What type of energy is experienced by the passengers travelling down the ramp of a roller coasted?
Kinetic Energy.
A train is moving with a force of 62,000N and accelerating at 2.5 m/s2. What is its mass?
24,800 kg
What is the acceleration of gravity?
What are the three forces that act upon a car rolling to a stop?
Gravity, Friction, and Air Resistance.
What is Newton's 3rd Law of Motion?
For every action there is an equal and opposite reaction.
What are the two non - contact forces that are always acting on an object?
Gravity & Air Resistance
What does the M stand for in the F=MA equation?
Mass
Gravity ALWAYS pushes in what direction?
Down