BW-Sci Force SG Study Guide 10/26

A push or pull a force
Forces may or may not cause what? objects to move, stop moving, or change directions
Two forces __________________ in size and acting in _______________ directions on an object are balanced. equalopposite
If the force is balanced, the object stays ____________________- or continues to move at the same _______________ and in the same __________________. the samespeedvelocity (or direction)
An example of a balanced force a book resting on a table
Unbalanced force is two forces that are __________________ in size and opposite direction. different
Unbalanced forces causes an object to change ________________ or _______________________ or both. motion direction
An example of an unbalanced force kicking a football or a car slowing down
The overall force acting on an object Net force
What is the overall force acting on an object measured in? Newtons
A lamp sitting on a table is demonstrating Newton's _____________ law. 1st
A roller coaster heading down a hill is ____________________. accelerating
Newton's 3rd law states that for every action there is an equal and opposite __________________. reaction
A car traveling at 65 mph is an example of its __________________. speed
Newton's __________________ Law says that acceleration of an object depends on its applied force and mass. 2nd
If an object stays still or continues moving at the same speed and in the same direction, it is a ______________ force. Balanced
The earth moving plates is an example of ___________________ forces. unbalanced
Which of Newton's laws explain a rocket's movement during launch? 3rd
Sitting at the top of a steep hill on a roller coaster (not moving) is an example of inertia
If the mass of an object is 200kg and the applied force is 2600 N calculate acceleration. acceleration = force divided by mass = 13 m/s/s
If the acceleration is 600 m/s/s and the mass is 300 kg, calculate the force. force = mass times acceleration = 180,000 N
If the force is 2500N and the acceleration is 500 m/s.s, calculate the mass. mass = force divided by acceleration = 5 kg
If a soccer ball is kicked first by a second grader and then again by an eighth grader, what will be the difference in the ball's acceleration? the eighth grader will have more force on the ball because he/she will have more mass
If an object is moving, is that a balanced force or unbalanced force? unbalanced
If an object is not moving, that is a balanced force or unbalanced force? balanced
What can happen to the speed of an object that has an unbalanced force acts on it? it can increase or decrease
What can happen to the direction of an object as an unbalanced force acting on it? it can move in the same or opposite direction as the force
Gravity is equal to what two things? 9.8 m/s2 and acceleration of a falling object
If you round gravity what number is it? 10 m/s2
Gravitational force determines what? weight
When you float in water what is acting on you? Gravity pulling you down.Water pushing you up (buoyancy)
Other than gravity what else acts on objects that are falling? air resistance
An object on earth will weigh _______________________ than it would on the moon. more