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
Wet roads
Icy roads
Badly maintained brakes
Bald tyres
Passengers / mass
Speed
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
Air resistance is 250N
What is the Resultant force?
550N
Force that acts upwards in water
Upthrust
The momentum of an object depends on two things - what are they? (DOUBLE)
MASS and SPEED
Define the term contact force.
A force that causes an effect through physical contact.
M = F/A
What are the three forces that act upon a car rolling to a stop?
Gravity, Friction, and Air Resistance.
What does the gradient on a distance time graph show us?
Speed
I am underwater. Upthrust is 1000N and weight is 900N
What happens?
I move upwards
What type of energy is sound?
Kinetic Energy.
Define the term non-contact force.
A force that causes an effect without 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 type of energy is experienced by the passengers travelling down the ramp of a roller coasted?
Kinetic Energy.
What type of energy is held in a spring?
Elastic Potential Energy.
What type of force is equal in magnitude and opposite in direction?
A Balanced Force.
If an object has a force of 1 Newton pushing left, and 1.5 Newton pushing right, is the force balanced or unbalanced?
Unbalanced.
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.
What type of energy is experienced by the passengers of a roller coaster, when they are at the top of the ramp waiting to head down?
Gravitational Potential Energy.
Four contact forces
Friction
Air resistance
Tension
Normal contact
Every Action has an equal and opposite reaction
What is Newtons 3rd Law
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
A train is moving with a force of 62,000N and accelerating at 2.5 m/s2. What is its mass?
24,800 kg