What is a force?
A push or a pull
Motion is described as a change of ........ of an object.
position
Please name the TYPE of motion on the picture.
Up and down
Please name the TYPE of motion on the picture.
Round and round
Please name the TYPE of motion on the picture.
Back and forth
Please name the TYPE of motion on the picture.
Zig-zag
Please name the TYPE of motion on the picture.
Straight line
What occurs when 2 surfaces rub against each other?
Friction
What kind of surface will have high (very strong) friction?
Rough
What kind of surface will have low (very small) friction?
Smooth
Who discovered gravity?
Isaac Newton
A force that pulls all objects to the center of the Earth is called...
Gravity
Gravity depends on ...... The bigger the ......, the stronger the gravity.
Mass
What is this effect of force?
Causing (starting) motion
What is this effect of force?
Stops motion
What is this effect of force?
Changing speed
