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Forces
Balanced and Unbalanced Forces
Newton's 1st Law
Newton's 2nd Law
Newton's 3rd Law
100
A force requires either this or this.
What is a push or pull
100
These kinds of forces must act on an object in order for the object to remain at rest.
What are balanced forces?
100
(1st law) Also known as this.
What is the law of inertia?
100
an objects acceleration depends upon this according to the 2nd law.
What is mass?
100
Forces always act in this, according to Newton's 3rd law.
What are pairs?
200
Forces are measured with this instrument.
What is a spring scale?
200
A car pulls away from a stoplight? These kind of forces are acting on the car.
What are unbalanced forces?
200
A change in motion is called this.
What is acceleration?
200
If you pushed a ping pong ball and a golf ball with the same amount of force, this would go further.
What is the ping pong ball?
200
These 2 characteristics are always true about 2 forces acting in a pair.
What is the are equal and opposite?
300
This force decreases as the distance between the objects increases.
What is gravity?
300
A car moves at a constant velocity down a straight road. These kind of forces are acting on the car.
What are balanced forces?
300
No acceleration can happen without this.
What is an unbalanced force?
300
This is the formula that determines the force of an object.
What is force= mass x acceleration?
300
Scientists refer to a pair of forces with these terms.
What are action and reaction?
400
Friction between air and a moving object is called this.
What is air resistance?
400
If gravity pulls down on a piece of metal that rings a bell with a force of 10 N, this much force is needed to cause the piece of metal to rise.
What is a force greater than 10 N?
400
Sir Isaac Newton published his laws of motion in what decade?
What is 1680's?
400
If the mass of an object is 9 grams and its acceleration is 12 cm/second, this is the force needed to move it.
What is 108 Newtons?
400
When a rocket takes off, these are the equal and opposite reactions.
What are rocket thrusters pushing down and rocket pushing upward?
500
4 things that forces can cause an object at rest to do.
What are speed up, slow down, change direction, stop or change shape.
500
The relationship between the mass of an object and the force it takes to change its motion.
What is the greater the mass, the more force it takes?
500
An example of Newton's 1st law of motion.
What is teacher discretion? I'll tell you if you are right or wrong.
500
The acceleration of a football has a value of 9. the force that starts the football moving has a value of 63 N. This is the football's mass.
What is 7 units?
500
In space, this causes an astronaut to feel weightless.
What is microgravity?