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)

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)

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

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

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)

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