Gravity
The force of gravity is also known as
Weight
You and your friend are playing tug of war. Your friend pulls with a force of 55 N to the right. You pull with a force of 65 N to the left. What is the net force on the rope?
10 N left
Wind pushes a toy sailboat across a pond. The boat moves in a straight path. What is changing?
The boats position
True or False: objects that are smooth have LESS friction than objects that are rough
True
What law is best described by inertia?
1st
As distance between two objects increase the pull of gravity
Decreases
Find the net force: 15 N to the right, and another 15 N to the right.
30 N Right
Motion is measured as _____
Rate
Friction is a force that acts in an ___________ direction of movement.
Opposite
A magician pulls a tablecloth out from under dishes and glasses on a table without disturbing them.
Newton's 1st law
Air resistance is equal to gravity
Which force produces a change in motion?
Unbalanced force
A distance vs. time graph shows an object's
Speed
True or False: The rougher the surface, the faster an object will travel over the surface.
False
A person not paying attention while skateboarding hits a rock. The skateboard stops...they don't.
Where would you have to travel to reduce your weight but not lose any mass?
The moon
8 N to the left , and 4 N to the right. Find the net force. Is this balanced?
4 N Left; No
An object is _____ if its position changes relative to another object.
In motion
Which of these materials do you predict would have the MOST amount of friction?
Sand paper
What Unit do we Measure Force in?
Newtons
This FORCE pulls things. It PULLS things into orbit around the sun.
Gravity
How do you calculate Net Force if the forces are going different directions?
Subtract them
All motion is described as relative because
Everything in the universe is constantly in motion, so it depends on your frame of reference
Rough surfaces have _________
Greater friction
What is Newton's First Law?
An object at rest stays at rest, an object in motion stays in motion.