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Gravity
Terms in this set (52)
The force that pulls all objects toward one another
What is gravity?
The friction between an object and air
Which of these is considered a contact force?
50 N upward
A box has two forces acting on it. One force is 100 N upward. Another force is 50 N downward. What is the net force on the box?
Gravitational force
Melanie watched the path a baseball followed after a pitcher threw it. She noticed that the ball traveled horizontally away from the pitcher as well as downward toward the ground. What force caused the ball to accelerate in the downward direction when it was thrown?
Objects do not have to touch each other to experience a force
Why are some forces considered to be noncontact forces?
Friction is produced when objects slide past one another
Why is the friction force considered to be a contact force?
Magnets do not have to touch each other to experience a force
Why is the magnetic force considered to be a noncontact force?
The speed of the bird would be 17 meters per second
A bird flies at 12.5 meters per second. The wind speed is 4.5 meters per second. What is the speed of the bird when it flies with the wind?
The speed of the bird would be 8 meters per second.
What is the speed of the bird when it flies against the wind?
Gravity, friction, floor, and Merck are acting on the box
Marek is trying to push a box of sports equipment across the floor. The arrow not he box is a vector showing the force Marek exerts. Describe all the forces acting on the box.
Merek's force needs to be greater than the force of the friction
Explain what needs to happen for the box to start moving.
You would add if they go in the same direction. You would subtract if they go in the opposite direction.
Explain how to calculate the net force in any direction on the box
It is going to stay in the same place because they have the same force acting on it.
Determine the net force upward and downward
It is going right because 100N's is greater than 50N's
Determine the net force to the right or left
The box will move to the right
Predict how the box will move
The 1 kg ball accelerates twice as much as the 2 kg ball
Jessica is comparing two balls. One ball has a mass of 1 kg, and the other has a mass of 2 kg. She pushes each with a force of 100N. How do the accelerations of the two balls compare?
The boat moves away from the dock
A fisherman steps off a boat, which is in the water, onto a dock. What happens?
The forces exerted when they collide are equal and opposing
When 2 objects having different masses collide, they move away from each other at different speeds. Which is true of the forces exerted at the moment of impact?
1m/s
An airplane is traveling at a speed of 200m/s relative to the Earth. A person walks toward the front of the plane at a speed of 1 m/s How fast is the person traveling in reference to the other people on the airplane?
Only b will accelerate
Two equal forces act in opposite directions on object A. Two unequal forces act in opposite directions on object B. If these are the only forces acting on objects A and B, which of these conclusions is true?
The net force is zero, and all the forces are balanced
The diagram shows the forces acting on a running shoe. As force F is applied, the shoe does not move. which statement describes the forces?
5mls x 1kg = 5N The object is accelerating
A 1kg object accelerates at a rate of 5 m/s2. Calculate the net force on the object and explain how its motion is changing.
There is gravitational force acting on the person. The sidewalk pushes back with the same force. The forces are balanced. When they begin walking the forces become unbalanced.
Describe the forces that are acting on a person who is standing still on a sidewalk, and identify whether the forces are balanced or unbalanced. Describe how the forces would change if the person started walking.
The opposing forces are the same. The skater with more force will accelerate less.
Two ice skaters on ice push away from each other. What will be the effect of th forces of their pushing each other if their masses are different?
Large and pulls objects toward itself
Which of these describes the gravitational force from a planet?
Car and bowling ball
Which pair objects has the largest gravitational force?
The friction is smaller between the blanket and the floor than between the furniture and the floor.
Sean is moving heavy furniture by sliding it across the floor. He puts a blanket underneath the furniture. Why did this help him?
The gravitational force between the two objects is weak because their masses are small.
Two basketballs are sitting 1m apart and are not moving. Which best explains why the gravitational force does not cause them to move?
There is a gravitational force between the hand and the cup, but Earth's gravity is stronger, so Earth's gravity pulls the cup down.
If someone drops a cup, it falls to the ground. Why doesn't the gravitational force between the person's hand and the cup keep the cup keep falling?
A hockey puck slides toward the goal
In which situation is it better to have low friction?
The weight of an object is three times larger on planet B
Planets A and B are both the same size but planet B has three times the mass of planet A. How does the weight of an object compare on the two planets?
She is correct because earth is bigger than the moon. Number 1 helped me.
A spaceship is moving in a straight line on its way to a planet. The pilot sees that the planet is ahead and to the left. She claims that she does not need to use the engines to push the ship toward the planet. Explain why the pilot is correct or incorrect.
The friction decreased after using the sandpaper
A carpenter uses sandpaper on a piece of wood. Before, the wood felt rough. After the wood felt smooth. DId the friction between the hand and the wood increase or decrease after using the sandpaper?
The sandpaper and wood make it smoother by making rubbing friction.
Describe what the sandpaper did to the wood to make it smoother.
The difference in gravitational force is distance and mass.
Two objects, A and B are 10m apart. Objects C and D m apart. The gravitational attraction between objects C and D is greater than the attraction between objects A and B. Explain the reason for the difference in gravitational attraction.
Data
Information, often numerical, which gathered for statistical purposes
Bar graph
A graph using bars to compare quantities. The height or length of each bar represents a designated number
Scale
The set of all possible values of a given measurement, including the least and greatest numbers in the set, separated by the intervals used
Vertical axis
The axis on which the scale and interval are shown in a bar or line graph
Horizontal axis
The axis on which the categories or values are shown in a bar and line graph
Line graph
A graph used to show how a set of data changes over a period of time
Stem and leaf plot
A system used to condense a set of data where the greatest place value of the data forms the stem and teh next greatest place value forms the leaves
Line plot
A diagram that shows the frequency of data on a number line
The ball has less mass, so the equal force on the ball and the bat causes greater acceleration of the ball
During a baseball game, a hitter strikes the ball with a bat. When this happens, the ball and the bat exert a force on each other. Why does the ball accelerate away from the bat more than the bat accelerates away from the ball?
Each marble exerts a force not the other, and the two forces are equal and in opposite directions
One marble is moving and collides with a stationary marble. Which of these statements is true
The forces are exerted on different objects and neither force is zero
A soccer player kicks a ball. The player's foot exerts a force on the ball. The ball exerts a force on the foot. Why don't the forces cancel out to result in a net force of zero.
To increase the amount of time it takes for the collision to occur decreasing the force of the collision
The front of a car is designed to crumple during a crash. What is the purpose of this?
The club with the greatest mass because it will provide the largest force to the golf ball
A golfer has a choice of several golf clubs with different masses that he can use to hit a golf ball. He can swing all the clubs at the same speed. If he wants to hit the golf ball as far as possible, which club should he choose?
You would need something soft, like a sterofoam to absorb any energy from any possible collision
A worker at a delivery company is packing a fragile object in a box. He needs to choose a material to go into the box to keep the object from breaking. Identify one property that the material must have in order to solve the design problem and explain why it must have this property.
They would need the same mass
Two bumper cars move toward each other and collide. In what situation would they have the same acceleration during the collision?
5 m/s
Ben has 2 carts with masses of 100g and 200g. He pushes the smaller cart toward the larger cart and they collide. The smaller cart rebounds back in the direction it came from. He measures the force on the smaller cart from the larger cart to be 500N. What was the magnititude of the acceleration of the smaller cart?
250 N
Ben has 2 carts with masses of 100g and 200g. He pushes the smaller cart toward the larger cart and they collide. The smaller cart rebounds back in the direction it came from. He measures the force on the smaller cart from the larger cart to be 500N. What force does the smaller cart exert on the larger cart?
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