A
B
C
D
E
100
Is this an example of a push or a pull?
Magnetism
Friction
Gravity
Magnetism-Pull
Friction-Push
Gravity-Pull
100
Which of the following is an example of a push force?
A. picking up your notebook off the ground
B. climbing a rope in gym class
C. writing a paper in English class
D. unplugging your computer charger from the wall
C. writing a paper in English class
100
A melon on a table is shown.
How would the melon's motion change if there were no outside forces, including gravity, acting on the melon?
A. It would roll off the table.
B. It would float straight up.
C. It would remain in the same position.
D. It would roll to the other side of the table.
C. It would remain in the same position.
100
A boat with a jet engine demonstrates Newton's law of action-reaction. Why is this true?
A. As the boat expels exhaust forward, the boat remains stationary.
B. As the boat expels exhaust backward and forward, the boat remains stationary.
C. As the boat expels exhaust forward, the boat moves forward.
D. As the boat expels exhaust backward, the boat moves forward.
D. As the boat expels exhaust backward, the boat moves forward.
100
The movement of an object is determined by its mass and the —
A. object's speed compared to the speed of light.
B. forces that are acting on it.
C. volume of the object.
D. weight of the object.
B. forces that are acting on it.
200
Micah tested three different paper airplanes he had made in science class. The airplanes were of various sizes and made of three kinds of paper.
What was a constant variable in his experiment?
A. the type of paper used
B. the force of gravity acting on each airplane
C. the size of the airplanes
D. the amount of acceleration each airplane experienced in the air
B. the force of gravity acting on each airplane
200
Maria and her mom are repainting an old dresser. Before they can start painting, they have to remove the old paint. Which object below has the greatest amount of friction and would be the most effective at removing the old paint from the dresser?
A. wet sponge
B. rubber mat
C. sandpaper
D. wax paper
C. sandpaper
200
Unbalanced forces —
A. cause the motion of an object to change.
B. allow an object to remain at rest.
C. are always greater than the force of gravity.
D. cancel each other out to a net force of zero.
A. cause the motion of an object to change.
200
When someone steps off the edge of a swimming pool into 10 feet of water, he or she does not even come close to touching the bottom of the pool. Yet, when he or she dives off the high diving board into the same depth, it's necessary for that person to pull up quickly to keep from hitting the bottom. Based on Newton's law of force and acceleration, this is because —
A. an object falls faster and harder the longer it falls.
B. diving propels the body into the water, while stepping just allows the body to fall.
C. a diving body is more streamlined than a stepping body.
D. an object falls more quickly through a liquid than it does through the air.
A. an object falls faster and harder the longer it falls.
200
Inertia refers to the —
A. resistance of an object to gravitational force.
B. tendency of an object to accelerate as it moves downhill.
C. change from potential energy to kinetic energy.
D. tendency of an object to maintain its state of motion unless acted upon by a force.
D. tendency of an object to maintain its state of motion unless acted upon by a force.
300
Air resistance is defined as friction of passing air on an object in motion. Click on the arrow that shows the direction of the frictional force on a football being thrown through the air.
<______
300
Balanced forces are two equal but opposite forces. Which of the following is an example of a classroom object being acted upon by balanced forces?
A. a student's pencil that she is tapping on her notebook
B. the hands on the classroom clock
C. a water bottle sitting on a student's desk
D. a textbook that is being opened
C. a water bottle sitting on a student's desk
300
Two teams are competing in a game of tug-of-war in the diagram below.
Both teams are pulling with a force of 2300 newtons. What will happen if the team on the left makes an extra effort and pulls the rope with a force of 2330 newtons?
Both teams are pulling with a force of 2300 newtons. What will happen if the team on the left makes an extra effort and pulls the rope with a force of 2330 newtons?
A. The team on the left will be able to pull the other team to the left at a constant speed.
B. The team on the right will be able to pull the other team to the left at a constant speed.
C. The team on the left will be able to pull the other team to the left at an increasing speed.
D. The team on the right will be able to pull the other team to the right at an increasing speed.
C.The team on the left will be able to pull the other team to the left at an increasing speed.
300
Two shoppers grab the same box with a discounted flat screen TV inside. Each shopper grabs one end of the box and starts pulling the box toward himself. In an attempt to get the TV, the shoppers end up in a standoff, where the box is not moving toward either shopper. What caused the standoff between the shoppers?
A. The force of friction
B. Balanced forces
C. The force of gravity
D. Unbalanced forces
B. Balanced forces
300
balanced or unbalanced
changing direction
unbalanced
400
Kevin is conducting an experiment in which he rolls a toy car across three different surfaces: a tile floor, concrete, and grass. On which surface do you think the toy car will roll the shortest distance and why?
A. the concrete because concrete has the greatest amount of friction
B. the grass because grass has the least amount of friction
C. the tile floor because the tile has the least amount of friction
D. the grass because the grass has the greatest amount of friction
D. the grass because the grass has the greatest amount of friction
400
The swing shown above is attached to the tree with knots. When a person sits on the swing, which of the following forces helps keep the person from falling?
A. friction
B. normal
C. gravity
D. weight of student
B. normal
400
The diagram models the forces acting on a box.
Which of the following best describes the motion of the box?
Which of the following best describes the motion of the box?
A. The box is moving downward with increasing speed.
B. The box is moving with constant speed to the right.
C. The box is moving with constant speed to the left.
D. The box is moving upward with increasing speed.
A. The box is moving downward with increasing speed.
400
A little boy is being pulled in a wagon by his mother. Suddenly, the little boy's mother stops to watch for cars before she crosses the street. The little boy's body continues to move forward in the stopped wagon until his feet push against the front of the wagon. The forward movement of the boy's body shows —
A. Newton's law of gravity.
B. Newton's law of inertia.
C. Newton's law of force and acceleration.
D. Newton's law of action-reaction.
B. Newton's law of inertia.
400
which is a balanced force?
a tv stuck on a wall or changing direction
a tv stuck on a wall
500
Kevin is conducting an experiment where he rolls a toy car across three different surfaces: a tile floor, concrete, and grass. What force do you think Kevin is investigating?
A. gravity
B. friction
C. magnetism
D. acceleration
B. friction
500
Which of the following objects is MOST likely to be slowed by the force of gravity?
A. a car rolling up a hill
B. a ball rolling on flat ground
C.an airplane flying on a level course
D. a skydiver falling toward Earth
A. a car rolling up a hill
500
A ball is rolled in a straight line on a smooth surface. No friction is produced, and the surface extends indefinitely. According to Newton's law of inertia, the ball will —
A. continue to roll in a straight line and remain at a constant speed.
B. continue to roll in a straight line and gradually increase in speed.
C. continue to roll in a straight line and increase, then decrease in speed.
D. continue to roll in a straight line and eventually slow to a stop.
A. continue to roll in a straight line and remain at a constant speed.
500
Ray is sitting on a couch. Gravity exerts a downward force on him. Based on Newton's law of action-reaction, the other force acting on Ray is the —
A. upward force of the couch.
B. upward force of momentum.
C. downward force of air pressure.
D. downward force of the floor.
A. upward force of the couch.
500
if an object is not moving the forces acting on it are
balanced