Forces
This force causes all masses to attract each other.
What is gravity?
When the net force on an object is zero.
What is equilibrium?
Newton’s 1st law is also called the Law of ______.
Inertia.
The transfer of energy that results from applying a force over a distance
What is work?
Convert the following to scientific notation: 0.0000000000667
6.67 X 10-11
The metric unit of force.
What is the Newton?
Complete the Statement: Equilibrium means all forces _______________________.
Cancel each other out or are balanced.
State Newton's 1st Law.
“When the net force is zero, objects at rest stay at rest and objects in motion keep moving with the same speed and direction.”
ratio of usable output work divided by total input work
What is efficiency?
Convert the follow from scientific notation back to standard notation:
5.3 x 10-6
0.0000053
Force is a vector like velocity. What is a vector quantity?
A vector quantity give both its magnitude and its direction.
The sum of all the forces on an object
What is net force?
The relationships between force, mass, and acceleration are combined in the formula for Newton’s _________ law.
Second.
The rate at which work is done.
What is power?
Multiply the following, giving your answer in scientific notation:
(4 x 103) x (2 x 108)
8 X 1011
Three forces that act at a distance.
What are gravity, electricity, and magnetism?
Is it possible to arrange three forces of 100 N, 200 N, and 300 N so they are in equilibrium? Explain.
Yes. Place the 100 N and 200 N forces opposite of the 300 N force.
Complete the statement: There can never be a single force acting alone, forces work __________.
In pairs.
An unpowered mechanical device that accomplishes a task with only one movement.
What is a simple machine?
Multiply the following, giving your answer in scientific notation.
(3 x 108) x (4 x 102)
1.2 x 1011
The pulling force carried by a rope.
What is tension?
A person with a weight of 400 N is sitting motionless on a swing. For the swing to be in equilibrium, what is the tension force in each rope holding up the swing?
200 N. The tension force in both ropes has to be equal to the weight it is supporting. So 400 N/ 2 ropes = 200 N in each rope.
What is the equation for Newton's 2nd Law?
a=F/m or F=m*a
Give an example of a simple machine found in your body.
Your arms and legs, for example, work as levers to move and lift objects. Your neck, lower jaw, teeth and feet are all levers.
Divide the following, giving your answer in scientific notation.
(9 x 108) x (6 x 102)1.5 x 106
1.5 x 106