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Q 1/21
Score 0
Luis rubbed a balloon on his hair and held the balloon next to the wall. He observed the balloon stick to the wall.
Which of the following is responsible for the balloon sticking to
the wall?
30
Friction
Magnetic force
Gravity
Electric force
Q 2/21
Score 0
Gravity is a force that every mass exerts on every other mass. When you jump up in the air, not only does the Earth exert a gravitational force on you, but you also exert a gravitational force on the Earth. You, of course, fall back down to the Earth.
Which of the following explains why the Earth is not moving toward you when you jump up in the air?
30
Earth's fixed orbit around the Sun keeps it from moving.
You don't weigh enough to affect Earth's surface.
Your mass is very small compared to Earth's mass.
Earth exerts a gravitational force on itself.
21 questions
Q.
Luis rubbed a balloon on his hair and held the balloon next to the wall. He observed the balloon stick to the wall.
Which of the following is responsible for the balloon sticking to
the wall?
1
30 sec
Q.
Gravity is a force that every mass exerts on every other mass. When you jump up in the air, not only does the Earth exert a gravitational force on you, but you also exert a gravitational force on the Earth. You, of course, fall back down to the Earth.
Which of the following explains why the Earth is not moving toward you when you jump up in the air?
2
30 sec
Q.
Meg designs an experiment to see which of three types of sneakers provides the most friction.
She uses the equipment listed below.
1. Sneaker 1 3. Sneaker 3
2. Sneaker 2 4. Spring scale
She uses the setup illustrated above and pulls the spring scale to the left.
In what direction does the force of friction act?
3
30 sec
Q.
Penny says that dust particles in space cannot be pulled together by gravity because they have very little mass. Emma says as long as the dust particles have any mass at all, gravity can pull them together. Who has a better argument and why?
4
30 sec
Q.
Gordon is making a list of forces for his science class.
Which of the following should Gordon NOT list as a force?
5
30 sec
Q.
Ignoring mass and weight contributed by fuel, what happens when the space shuttle takes off and moves away from Earth?
6
30 sec
Q.
The law of universal gravitation states that any two objects in the universe that have mass, without exception,
7
30 sec
Q.
The forces acting on a falling apple are
8
30 sec
Q.
The gravitational force between two objects increases as mass
9
30 sec
Q.
The force of gravity on a person or object on the surface of a planet is called
10
30 sec
Q.
Which of the following is an example of a contact force?
11
30 sec
Q.
A force acting in the opposite direction of an object in motion. It slows down the motion or actually stops it.
12
30 sec
Q.
The sum of all forces acting on an object and direction
13
30 sec
Q.
What is the net force of an object that is not moving?
14
30 sec
Q.
The type of forces that will cause an object to move or to change its motion (speed/ direction):
15
30 sec
Q.
Calculate the net force (value and direction)
16
30 sec
Q.
The diagram below shows forces acting on a model airplane. Both its speed and height above the ground are constant.
Which of the following conditions would cause the model airplane to descend toward the ground?
17
30 sec
Q.
What happens when two forces act on the same object in the same direction?
18
30 sec
Q.
What statement CORRECTLY describes the motion of an object which motion is represented by the graph?
19
30 sec
Q.
What is the net force in this diagram?
20
30 sec
Q.
A man walks 20 km in 4 hours. Find his speed (Speed = Distance/ Time)
