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# Science 3/22

What is the unit for forces? Newtons
How do you use a springscale to measure force? 1. Zero Out 2. Determine Scale 3. Take Measurement 4. Check with team
How do you calculate the net force? Same Direction: Add together Opposite Directions: Subtract
What is meant by a balanced force and an unbalanced Force? Balanced=0, unbalanced doesn't
What effect does a balanced force have on the motion of an object? If moving, continues to move at a constant velocity If not moving, does not move
What effect does an unbalanced force have on the motion of an object? If moving, slows down, speeds up, or turns If not moving, starts moving
Do all objects have gravity or just large objects like planets? All objects
What two factors does the force of gravity depend on? Distance and Mass
What are the two Forms of friction? Static and Kinetic
Wha is static friction? Stationary
What is kinetic friction? Moving
What are the three types of friction? Sliding- one object slides over another Rolling- one object rolls over another Fluid- On surface moves through a fluid (gas or liquid)
How can friction be reduced so you can pull a heavy object with less force? Change the type of friction
What does it mean for an object to be in free fall? Only force acting is gravity
What is the acceleration of an object that is in free fall? 9.8 m/sec/sec
How do you determine the final velocity of an object in free fall? Vf=Vi+AT
How do you determine the distance an object in free fall has traveled? d= ViT+1/2at^2
What does air resistance do to the motion of an object that is in free fall? Decrease the acceleration
What does an unbalanced force cause? The object to accelerate
What does a balanced force cause? The object doesn't accelerate
What is a force diagram? Shows all the forces acting an object with arrows where the length of the arrow represents the strength.
What is friction? Force that opposes motion and causes an object to slow down.
What is stronger, static or kinetic friction? Static
What is the Law of Universal Gravitation? The force of gravity acts between all objects in the universe. The larger the masses the greater the force. The closer the masses are the greater the force.
What is terminal velocity? When the downward force of gravity is balanced by the upward force of air resistance, the object stops accelerating and moves at a constant (maximum) speed. Depends on velocity, surface area and mass.
What is projectile motion? The motion of a projectile (a thrown object) is both horizontal and vertical. Two objects (1 dropped vertically, 1 thrown horizontally) will reach the ground at the same time because both are in free fall.
Created by: kwaltzer23

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