Friction is the force that acts to oppose sliding between two surfaces.
100
What is Gravity?
Gravity is the force that pulls an object down.
100
What is the average speed of a car that traveled 500 meters in 25 seconds?
20 meters per second
100
What is inertia?
The force that keeps you moving once you are moving, and keeps you at rest when you are at rest.
100
What occurs when forces are balanced?
There is NO CHANGE IN MOTION.
200
Friction makes it difficult for an object _______________.
to start moving.
200
What does gravity depend on?
1. mass
2. distance they are apart.
200
A bird flies at a constant speed of 3.2 meters per hour for 3 hours. How far does it fly?
9.6 meters
200
Does this illustrate inertia?
A 100-pound box is harder to put into motion than a 10-pound box.
Yes, explain why please..
200
What occurs when forces are unbalanced?
There WILL BE A CHANGE IN MOTION.
300
The smoother two objects are, the ________ friction there is between them.
less
300
As an object falls, gravity continually ___________ the object's speed.
increases
300
A car travels 68 miles per hour for 6 hours. How far does it travel?
11.3 hours
300
Which object has the greatest inertia?
1. an object with a mass of 1 kg.
2. an object with a mass of 5 kg.
3. an object with a mass of 67 kg.
Answer 3
300
Two teams are playing tug-of-war with a ribbon tied directly to the center. Team A is pulling with a force of 350 newtons. Team B is pulling with a force of 500 newtons. What is the direction and magnitude of force?
The direction will be toward Team A with a magnitude of 150 newtons.
400
What factors determine the amount of friction?
1. The kind of surface.
2. The amount of force.
400
Describe how gravity is affecting you currently.
It is pulling you towards the floor. You are not moving because the ground is pushing up against it.
400
Bob determines his dog can run 160 meters in 40 seconds. What is his dog's speed?
4 meters
400
According to inertia, if no forces act on a moving object....
It will keep moving.
400
An object traveling 11 newtons north collides with an object traveling 17 newtons south. What is the resulting direction and magnitude of force?
The direction will be south with a magnitude of 6 newtons.
500
How does changing the amount of mass affect gravity?
Changing the mass of an object will not affect gravity.
500
How does gravity effect a ball that is thrown in the air? Describe the complete process.
The ball will go up in the air, slow it's speed, begin to fall back towards Earth, and increase speed until it hits the ground.
500
What is the formula for average speed?
average speed = distance divided by time
500
Finish this statement:
An object at rest tries to ______________, and a moving object tries to __________________.
Stay at rest
Continue to move
500
David and Larry are moving a piece of furniture to the east side of the room. David is pushing east with a force of 28N, while Larry is pulling towards the east with 16 newtons of force. What is the resulting magnitude and direction of force?
The direction will be towards the east with 44 newtons of force.