An objects ___________ is a measure of the pull of gravity on its mass.
weight
100
Force= Mass x Acceleration
True
100
How many Laws of Motion are their?
3
100
If you are riding your bike at 8 km/hr and you start to pedal harder is acceleration occurring?
Yes because the speed will increase.
200
What is weight?
A force that gravity exerts on a mass.
200
__________ is the force responsible for stopping a moving object .
Friction
200
The motion of a violin is a circular motion.
False, vibration
200
What is the change of position of one object compared to the position of another object?
relative motion
200
What would happen to earth if the sun's gravity suddenly stopped pulling on the earth?
Earth would move off into space in a straight line.
300
Speed and direction tells us what?
velocity
300
______________is a unit used to describe weight (a force).
Newton
300
Galileo came up with the idea that gravity exists.
False, Newton
300
The laws of motion and ideas about gravity that explain the motions of the planets were developed by?
Newton
300
What two factors affect strength of the force of gravity between two objects ?
Mass of the two objects and distance between them
400
The measure of the force of attraction between the earth and an object is the objects....
weight
400
Speed is expressed in units of ___________________.
distance per time
400
The Second Law Of Motion states, " For Every action there is an equal and opposite reaction".
False, the Third Law of Motion
400
Which would be accelerated most by the same force?
a- an empty box
b- a box full of feathers
c- a box full of wood
d- a box full of rocks
a- an empty box
400
If you dropped a penny, a leaf, and a sheet of paper at the same time in a place where there was no air what would happen?
they would all hit the ground at the same time.
500
The distance and direction an object moves is its......
displacement
500
_____________ is a rapid movement back and forth.
Vibration
500
More friction will cause a car to skid on ice.
False, less
500
Which of the following is not a change in a car's velocity?
a-it slows down
b-it turns a corner
c- It maintains a constant speed and direction
d- it speeds up
c- It maintains a constant speed and direction
500
When you do push ups on the floor, the floor does what back to you?