Newton's Laws
What is Newton's 1st Law?
An object in motion will stay in motion and an object as rest will stay at rest unless acted on by an unbalanced force.
Draw the force vector for (75N, 25o) on the board
(teacher check)
True or False: the spring constant can be negative or positive
True
If an object is at equilibrium what is the net force?
0 N
The line about which an object turns is called...
Axis of rotation
What is Newton's 2nd Law?
The force of an object is equal to its mass times its acceleration
Give an example of a scalar quantity.
Time, Temperature or Length
Hooke's Law
When you are seated in a chair, the force exerted on you by the chair is called what force?
Normal Force
The parabolic path followed by a projectile is referred to as the
Trajectory
For every actions, there is an equal and opposite reaction
What are the three ways to show a force.
Graph, Polar Coordinates, Cartesian Coordinates.
When a spring is compressed what happens with the potential energy?
The potential energy stored in the spring increases
The force that resists the motion of objects due to contact between their surfaces is called ______ force.
Frictional Force
It can be seen that orbits of all planets and comets around the Sun are...
Circular
Which of Newton's 3 Laws is important when talking about Circular Motion?
Newton's 2nd Law
Draw the force vector for (5,3) N on the board
(teacher check)
The spring in a scale stretches 1cm when a 5N object hangs from it. How much does an object weight if it stretches the spring 2 cm?
10 N
What are the two ways to reduce friction?
1. use a lubricant
2. cushion of air
The force of centripetal force that allows a race car to go around a corner is
Inertia
Which of Newton's 3 Laws is an example of Equilibrium?
Newton's 3rd Law
A measured quantity that is described by stating a size and direction is called a...
A vector
What is the force exerted by a spring with a spring constant of 9.5 N/m that is stretched to 0.65m?
6.175N
What are the 4 types of friction
Rolling, Air, Static, Sliding
List two units in which angular speed can be measured?
rotations/min
degrees/s
radians/s