Force
The sum of all the forces acting on an object.
What is net force?
This is the force that opposes the sliding motion of two surfaces that are touching each other. e.g. rock rolling down a hill
What is friction?
True or false: There is gravity in space
true
The tendency of an object to resist any change in its motion. Also called Newton's First Law of Motion
What is inertia?
This is a friction-like force that opposes the motion of objects that move through the air. e.g. a feather
What is air resistance?
This happens to the motion (direction) of an object when you exert a force on it.
The motion of the object will change?
If friction could be removed (think - outer space), an object in motion would do this
continue to move in a straight line at a constant speed
Weight (in Science) calculated in ________
Newtons (N)
It is easier to push a 40kg ball than a 400kg ball. This is an example of Newton’s _____________
Second Law of Motion
When a basketball is bounced, the action is the upward movement of the ball. True or False
False. It's reaction
This occurs when students are pushing on an object e.g. a door, in opposite directions, with the same size force.
What is a balanced force?
Friction is a type of which force?
A) Contact force
B) non-contact force
C) magnetic force
A) contact force
The gravitational force exerted on an object is this.
What is weight?
A ball rolling down a hill will continue to roll unless friction or another force stops it. This is an example of Newton’s _____________
First Law of Motion
What does Newton's 2nd Law say?
2
F=ma. This means an unbalanced force will change an object's velocity. This looks like a change in speed AND/OR a change in direction.
This occurs during an unbalanced force.
The object moves
Friction always acts______________ the direction of motion of an object.
A. opposite to
B. in the same direction as
C. perpendicular to
A. Opposite
If you were no longer on Earth, ________ would remain the same, however _________ would change with gravity.
What are: mass and weight
(For the quiz, learn the diff between Mass and Weight)
To calculate the force an object exerts, you use this formula.
What is F = ma?
Which law describes what happens when a tablecloth is pulled out from under a setting of china without damaging it?
First Law of Motion
Give an example of action-reaction force
What are (could vary):
Bouncing basketball - bouncing down (action), bouncing back up (reaction)
rocket launch
The force of friction can be reduced by using which method? Hint: Tablecloth trick
lubricants like oil
cushion surfaces
ball bearing
The force of attraction between any object and every other object in the universe is called__________.
gravitational pull
Releasing a balloon full of air causes it to fly around the room as the gas released from inside propels the balloon through the air. This is an example of Newton’s ________________.
Third Law of Motion
A student has modified his pickup truck by putting on larger wheels. Why will his truck take longer to speed up and slow down.
A. Because the tires have increased the truck inertia.
B. Because the tires have increased the truck tires rotational inertia.
C. Both A and B are correct.
C
The larger wheels are harder to stop and start turning because they have more rotational inertia. Also, because they have more mass, they add to the truck's inertia