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?
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
Air resistance is 250N
What is the Resultant force?
550N
What is the unit of Force?
Newtons
What is Newton's third law?
For every action, there is an equal and opposite reaction
Tension
What is inertia?
The property of matter that resists changes in its state of motion.
What is the unit of velocity?
m/s
I am underwater. Upthrust is 1000N and weight is 900N
What happens?
I move upwards
What is the weight of 50kg object on earth?
500N
What is the rate of change of velocity?
Acceleration
What two states of motion can we have if our force are "balanced" or in equilibrium?
At rest or constant velocity.
What type of energy is experienced by the passengers travelling down the ramp of a roller coasted?
Kinetic Energy.
What is the unit of acceleration?
m/s^2
What two things effect friction?
The normal force and the coefficient of the friction (or the texture of surfaces)
What force is responsible for not allowing objects to phase through solid objects?
The normal 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.
Name the Four contact forces
Friction
Applied
Tension
Normal contact
What is Newton's first law?
States that an object at rest will stay at rest, and an object in motion will stay in motion at a constant velocity in a straight line, unless it is acted upon by a net external force
A box is sliding and slowing down due to friction. the box as a mass of 25kg and is slowing down at a rate of 4m/s^2. What is the coefficient of friction?
.4