Force
A push or pull that acts on an object.
What is force?
At the atomic level, no surface is smooth. True or False?
What is true?
All objects fall at the same rate of acceleration due to gravity, regardless of how heavy they are. True or false.
What is true? Heavier objects are not as affected by air resistance,
The tendency of an object to resist changes in it's velocity.
key words *acceleration due to gravity... air resistance
The SI unit for force.
What is the Newton (N)?
Friction is a force that results when surfaces of objects rub against each other and opposes this.
What is motion?
The motion of an object when it is falling solely under the influence of gravity.
What is "free fall"?
Newton's first law of motion.
What is "an object in motion (or at rest) will stay in motion (or at rest) until it is acted on by an outstide force"?
Explain why in exp. 7.2 the raw egg kept spinning but the hard boiled egg did not.
What is true?
Friction that opposes the initiation of motion is called this.
What is static?
What is 9.8 m/s2 (metric) and 32 ft/s2 (English)?
When an object is acted on by one or more unbalanced forces, the net force is equal to the mass of the object times the resulting acceleration.
What is Newton's second law?
Explain why in exp. 7.2 the coin traveled with the card when the card was moved slowly, but dropped into the jar when flicked quickly.
Key words: Newton's first law, friction, force
What is accelerates?
Friction that opposes motion once the motion has already started is called this or this.
What is kinetic or sliding friction?
The equation to calculate distance by timing an object as it falls is this.
What is d=1/2 x a x t2?
The formula for net force.
What is F=m x a ?
Explain in terms of Newton's third law what happened in exp. 7.3 with the baking soda, vinegar, bottle and stopper.
Key words: equal and opposition reaction,
When forces are balanced, and net force equals zero, there is no change in this.
Name two types of friction that have not been mentioned in the game so far.
What is rolling friction, fluid friction (or air resistance)?
What is 7.056 m
Solve for force. A man's car (m = 1500kg) has broken down and he is pushing it to a gas station. Ignoring friction, the net force (N) the man must push in order to make the car accelerate 0.03 m/s2 to the east is this.
What is 45 N?
Name and briefly explain the four fundamental forces.
Electromagnetic - (attract and repel)
Nuclear: Strong (keeps protons from repelling each other at distances inside the nucleus and holds protons and neutrons together) and
Weak: plays a role in particles breaking down or decaying. Governs processes in atoms in which on type of quark changes into another type
Gravitational - weakest of the four. Causes objects to have weight. Affects every object, but larger masses overcome friction, etc.