Science Knowledge checking Term 4

What is a motion? explain with your own language (you can find resources to help in your explanation, but do not copy paste it)

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Hints: it is positive when you move towards the grocery store and it is negative when you move towards your friends house (remember line graph)

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From this free body diagram, explain what are the force applied in the object

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From this free body diagram arrow, does this box will move or stay still? state your reason!

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Net force is

• the sum of all forces acting on an object

• the sum of applied force only

• the sum of your weight

In a tug of war, when one team is pulling with a force of 400 N and the other 300 N, what is the net force?

note:

Force going to the right is positive and force going to the left is negative.

• Net force = 300 N - 400 N = - 100 N

• Net force = 300 N + 400 N = 700 N

• Net force = 400 N - 300 N = 100 N

A man walks 20 m in 300 seconds. Find his speed! (speed formula: speed = distance / time)

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What is the unit of measure for force?

• kg

• Second

• Newton

• meter

Newton's first Law of Motion states :

• if there is no net force acting on an object it will remain at rest

• if there is no net force acting on an object it will be moving

What is the formula newton's second law of motion represented?

• F = m + a

• F = m x a

• F = m/a

• F = m - a