Grade 6 - Force, Motion, & Energy Flashcards
A noncontact force. Force that attracts or pulls objects toward each other without direct contact.
Gravity
A contact force.
Friction
Newton’s law of universal gravitation states -
that the force of gravity acts between all objects in the universe
Fill in the blanks:
Increasing the mass of the object increases their 1. ________, and increasing the distance between them 2. ______ the force.
- gravitational force
- decreases
On Earth, the force of gravity that pulls an apple or any other object toward the ground is its ______.
weight
The weight can be computed using the equation:
Weight = mass x gravitational field strength
weight = (in newtons, N)
mass = (in kilograms, kg)
gravitational field strength = (in N/kg)
_____ enables you to control movement. It prevents you from slipping when you walk.
Friction
Friction ___ with the mass of the object.
increases
A type of friction, it exists between air and on object moving through it.
air resistance
A parachute is acted upon by two forces.
- Earth’s gravity pulling it downward.
- Air resistance opposing its downward motion
How do you increase friction?
Friction may be increased by making surfaces rough.
Cite some ways to decrease friction.
Rough roads are covered with asphalt to smoothen their surfaces.
Using lubricants
A substance that can reduce friction between solid surfaces.
lubricant
Samples of lubricants
oil
wax
grease
Which of the following will be directly affected if you travel from earth to the moon.
a. air resistance
b. friction
c. mass
d. weight
D. Weight
