(1)Why don't people on the other side of the earth fall off ?
(2) Give a short explanation for the word " unit " used in physics.
(3) List any two contact forces.
​(4) Convert 40 ms^-1 ( metre per second ) to mph ( miles per hour )
1 hour = 3600 seconds
1 mile = 1609.34 m ​​​



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