Contact Forces
Some forces result when two objects physically touch each other. What is this called?
Contact Forces
A force is a __________ or _____________ on an object.
Push or pull
In what direction does friction work?
Opposite direction of motion
Weight = mass x gravity
What is the movement of an object?
Motion
A force that opposed motion
friction
The strength of force is measured in?
Newtons
What does the force of friction depend on?
The smoothness of the surface
What is the force of gravity on earth?
9.8 m/s2
If you apply a force in the _________ direction of the object's motion, you can slow down and stop the object
opposite
When two objects pull on a rope, string, wire or cable in opposite directions.
Tension
Repelling is using what kind of force?
Push
What can reduce friction?
Liquid
Would a person's mass on Jupiter be greater, less than, or the same as his mass on Earth?
SAME
If you apply a force in the _________ direction of the object's motion, you can increase the speed of the object
same
Force created by a stretched or compressed spring?
Spring force
Objects do not have to physically touch each other to exert force on the other? True or False
True
What is friction called when it is for gases and liquids?
Drag or air resistance
If a dog has a mass of 12 kg, what is its weight on Neptune?
Neptune gravity= 11.7 m/s2
140.4 N
If you apply a force in the _________ direction of the object's motion, you can cause the object to change direction.
perpendicular
Force exerted by a surface on an object resting on that surface?
Normal Force
What two things do all forces have?
Strength and direction
Air resistance depends on the mass of the object. True/False
False
If a book has a mass of 168 g, what is its weight on Earth?
1.6464 N
Will balanced or unbalanced forces move an object?
Unbalanced