Force
What is a force?
A push or a pull
How do we know when forces are balanced?
When it is still or at a constant speed, or when the forces cancel each other out, no change in speed or direction
A person is sitting on the ground. What forces are acting upon them?
Gravity, normal force
Jason is pulling a desk with a force of 10N to the right. Bob is also phushing the desk with a force of 20N to the right. What is the net force?
30N->
What do forces cause?
A change in speed, direction, size, or shape
How do we know when forces are unbalanced?
When something is moving, when something stops, change in speed or direction
A ball is thrown in the air. Then, it drops on a hill, and rolls. Then, it stops. What forces acted upon it?
Gravity, air resistance, friction
Sally and Sean are fighting over a toy. Sally pulls the toy with a force of 12N to the left. Sean pulls the toy with a force of 5N to the right. What is the net force?
7N<-
How are forces measured?
Newtons (N)
When two people are pulling a rope from different sides with different forces, is it balanced or unbalanced?
Unbalanced
How can mass apply to Newton's First Law?
The more mass an object has, the more force. The less mass an object has, the less force
Jay and Brooke are pushing the bed to the right. Jay pushes with a force of 25N and Brooke pushes with a force of 10N. What is the net force?
How did the unit of measurement for force come?
From the person who discovered them, Issac Newton
Martha and James are playing tug-of-war. Martha pulls with the same force as James. Balanced or unbalanced?
Balanced
Why don't moving things go on forever.
Unblanced forces cause it to stop
Gary and Ed are trying to carry a box to the right. Gary pulls with a force of 19N to the right. Ed couldn't tell his left from right, so he pulled with a force of 19N to the left. What is the net force?
0N
What is inertia
When an objcect at rest or in motion at a constant speed stays that way unless acted upon by an unbalanced force
A ball is sitting on the ground. Then it is kicked and it travels across the ground then slowly stops. At which points are the forces balanced?
When the ball is on the table, and after it has stopped
Is friction acting on an object when it is still?
No
Jane, Leon, and Oscar are fighting to figure out where to put a desk. Jane and Oscar pull the desk to the right. Jane pulls with a force of 11N. Oscar pulls with a force of 20N. Leon pulls to the left with a force of 17N. What is the net force?
14N->