Law of Gravity/Laws vs. Theories
Sarah has a 3-kilogram block and a 5-kilogram block. When would a block's gravitational force on Sarah be strongest?
a. when she stands one meter away from the 3-kilogram block
b. when she stands one meter away from the 5-kilogram block
c. when she stands five meters away from the 3-kilogram block
d. when she stands five meters away from the 5-kilogram block
b. when she stands one meter away from the 5-kilogram block
Which of the following is an example of an unbalanced force?
A. book resting on a table
B. ball sitting on top of a hill
C. car parked in a parking lot
D. person standing in moving elevator
D. person standing in moving elevator
What is Potential energy?
stored energy due to the interactions between objects
What is a force?
a push or pull on an object
The graph below shows the distance an object travels over time.
What is happening in the graph from point C to D?
A. The object is not moving.
B. The object is speeding up.
C. The object is moving away from the starting point at a constant speed.
D. The object is moving back to the starting point at a constant speed.
C. The object is moving away from the starting point at a constant speed.
If the distance between two objects is the same, which of the following have the greatest gravitational force between them?
a. a 50-kg object and an 80-kg object
b. a 65-kg object and a 65-kg object
c. a 65-kg object and a 75-kg object
d. a 60-kg object and a 70-kg object
c. a 65-kg object and a 75-kg object
The picture shows a car accelerating in the opposite direction of motion.
When does something accelerate in the direction opposite to its direction of motion?
A. when it speeds up
B. when it slows down
C. when it has stopped
D. when it travels backwards
B. when it slows down
What is kinetic Energy?
energy due to motion
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?
A. gravity
B. friction
C. electric force
D. magnetic force
C. electric force
What are the types of potential energy?
elastic potential energy and gravitational potential energy
What happens when the space shuttle takes off and moves away from Earth? Ignore the mass and weight contributed by fuel.
a. Its mass decreases and weight increases.
b. Its mass increases and weight decreases.
c. Its mass remains constant and weight decreases.
d. Its mass remains constant and weight increases.
c. Its mass remains constant and weight decreases.
The graph below shows the motion of a person on a skateboard.
How far did the person travel in 60 seconds?
A. 0 m
B. 10 m
C. 20 m
D. 40 m
D. 40 m
A scientific law describes something that happens in the natural world. What does the law of conservation of energy state about energy?
A. Energy cannot be created or destroyed.
B. Energy cannot be transformed from one form to another.
C. Energy can be created or destroyed only during energy transformations.
D. Energy cannot be transformed into more than one other type of energy.
A. Energy cannot be created or destroyed.
Which is a factor that affects the strength of gravitational, magnetic, and electrostatic force?
A. mass
B. volume
C. distance
D. temperature
A. mass
The graph below shows the distance an object moves over time.
What does the line on the graph represent?
A. no motion
B. constant speed
C. positive acceleration
D. negative acceleration
B. constant speed
On the moon, a bag of sugar has a weight of 3.7 Newtons (N) and a mass of 2.26 kilograms (kg). Which of the following describes the mass of the sugar on Earth?
a. same as its mass on the Moon
b. less than its mass on the Moon
c. same as its weight on the Moon
d. more than its mass on the Moon
a. same as its mass on the Moon
Balanced forces are acting on the ball in the picture.
Which of the following explains the net force on the ball?
A. zero
B. positive
C. negative
D. increased due to friction
A. zero
Which of the following equations defines the law of conservation of energy?
A. total energy = kinetic energy – potential energy
B. total energy = potential energy – kinetic energy
C. total energy = kinetic energy + potential energy
D. total energy = kinetic energy x potential energy
C. total energy = kinetic energy + potential energy
There are many examples of forces in the game of baseball. Which of the following is an example of a noncontact force?
A. The bat hits the ball.
B. The ball falls from the sky.
C. The player catches the ball.
D. The pitcher throws the ball
B. The ball falls from the sky.
Potential energy is a type of energy. Which of the following bricks has the most potential energy?
A. a two-pound brick that is three feet off the ground
B. a two-pound brick that is five feet off the ground
C. a four-pound brick that is three feet off the ground
D. a four-pound brick that is five feet off the ground
D. a four-pound brick that is five feet off the ground
What is the difference between mass and weight?
Mass is the amount of matter in an object. The amount of mass something has never changes.
Weight is a measure of the force of gravity acting on an object. Weight can change.
Mateo is pushing his sister Emma on a skateboard. Mateo is pushing with 35 N to the right. Emma pushes back with 42 N to the left. What is the net force and in what direction?
A. 7 N to the right
B. 7 N to the left
C. 77 N to the right
D. 77 N to the left
B. 7 N to the left
The image shows energy transformation that happens at three points after a basketball bounces up into the air.
Which best describes the change in energy that occurs at the three points?
A. All of the kinetic energy becomes potential energy and then all of the potential energy becomes kinetic energy.
B. All of the kinetic energy becomes potential energy and then some of the potential energy becomes kinetic energy.
C. Some of the kinetic energy becomes potential energy and then all of the potential energy becomes kinetic energy.
D. Some of the kinetic energy becomes potential energy and then some of the potential energy becomes kinetic energy.
B. All of the kinetic energy becomes potential energy and then some of the potential energy becomes kinetic energy.
Which of the following is an example of a contact force?
A. an apple falling from a tree
B. a magnet picking up safety pins
C. wind blowing leaves across a yard
D. the Moon orbiting around the Earth
C. wind blowing leaves across a yard
Which of the following is an example of a contact force?
A. an apple falling from a tree
B. a magnet picking up safety pins
C. wind blowing leaves across a yard
D. the Moon orbiting around the Earth
C. wind blowing leaves across a yard