Newton's Three Laws of Motion
What is Newton's First Law?
An object at rest will remain at rest and an object in motion will maintain at a constant velocity unless acted upon by a net external force
What units are used for mass?
Grams or Kilograms
Define net force.
The combined effect of all the forces on the object's acceleration.
What is static friction?
the force that prevents the motion of a stationary object.
What is the formula for gravitational force?
Fg = Gm1m2/r^2
Explain Newton's Second Law.
The sum of the external forces (F) on an object is directly proportional to the product of its mass (m) and acceleration (a).
How do mass and weight differ?
Mass is how much matter is in an object. Weight is the force of gravity on that mass.
How do you calculate net force?
Find the sum of the forces on an object in all directions.
What is kinetic friction?
the force that acts opposite to the motion of a moving object.
How does distance affect gravitational force?
As distance increases, the gravitational force decreases.
Give an example of Newton's Third Law.
*Responses will vary. An action that has an equal and opposite reaction.
How does mass affect weight on different planets?
Mass is directly proportional to the Force of gravity on the planet.
What happens when forces are balanced?
Compare static and kinetic friction coefficients.
How does mass affect gravitational force?
The larger the mass, the greater the gravitational force.
What is inertia?
The tendency of an object to resist a change in motion
What is the formula for weight?
F = mg
What is the net force when two equal forces act in opposite directions?
Zero.
What factors affect friction?
Mass and Material
If the distance of two objects is doubled, what happens to the gravitational force between them?
The gravitational force weakens by four times.
Give an example of Newton's Second Law.
*Answers will vary. An acceleration can only occur when a force is enacted.
What is the weight (in Newtons) of a 10 kg object?
100 Newtons.
Describe an example of unbalanced forces.
*Answers will vary. Unbalanced forces result in an acceleration of the object.
When is kinetic friction greater than static friction?
Never.
6.67 x 10^-11