Forces and Motion
Terms in this set (50)
A push or pull. They are measured with a spring scale in units called newtons (N).
Is a force of attraction between two objects. The size of this force increases as the mass of the objects increases. It decreases as the distance between the objects increase.
A force that opposes motion. Can also exist between air and a moving object as air resistance.
Forces on an object that are equal in size and opposite in direction. They cancel each other out.
Forces that cause a change in motion. A force must overcome the force of friction before an object will move.
What Forces were acting on the cyclists doing their jump stunts over Mr. Drag's head? Are all the forces balanced?
Gravity was pulling the cyclist toward the ground. Air resistance was slowing the cyclist's forward motion. Because the cyclist was changing speed and direction, the forces were not balanced.
Forces can cause an object at rest to _?_?
Forces can also change an object's _?_?
Forces can cause a moving object to Speed up, slow down, _?_, or stop.
When rowing a boat, the water pushes against the oars, this force cause the boat to _?_?
When riding a bicycle, Taylor Swift has to pedal harder on a rough surface to overcome the force of _?_
Are there any forces actin on dominoes that have fallen? If so, are they balanced or unbalanced? How do you know?
Yes. The table is pushing up on the bottom of each domino. Gravity is pulling each domino down. There two forces are balanced; otherwise the dominoes would be moving.
The forces on the dominoes are _?_ when they are standing upright. When a falling domino hits them, the forces become _?_ and they fall.
The push on the first domino was a(n) _?_ force that caused it to fall into the next domino. As each domino fall, it transferred the force to the next domino.
The force exerted on a domino by the falling dominoes is balanced by the force of a stationary object. Because the forces are _?_, the domino doesn't move.
Use forces to explain why Taylor Swift can't ring the bell on pg 312?
She can't swing the hammer with a force as great as Lorde can.
A _?_ force will cause a _?_ change in the motion of the when two balls collide.
A small force will cause _?_ change when two objects collide.
Which would cause a greater change in motion - a small fan blowing on a stack of papers or a large fan?
The large fan would cause a greater change in motion because it would produce a larger unbalanced force.
If gravity pulls down on the piece of metal that rings the bell on page 312 with a force of 10 N, how much force is needed to cause the piece of metal to rise?
A force that is greater than 10 N.
If two similar vehicles with one vehicle being heavier than the other begin to brake at the same point, why would one truck take longer to stop?
Because the force slowing the trucks is the same, the lighter one will slow down faster than the heavier.
Rank and match the following objects by mass and acceleration: Foam Ball, Baseball, Steel Ball, Greatest acceleration, Medium acceleration, and least acceleration.
Foam ball - greatest, baseball - medium, steel ball - least acceleration
Light cars are used in drag racing because a car with less mass _?_ faster than a car with more mass.
What forces act on a rocket while it's at rest on Earth's surface? Are they balanced or unbalanced?
Gravity pulls the rocket downward. Earth's surface pushes up on it. The forces must be balanced, because the rocket does not move.
At what points during the Rover's trip to Mars are the forces on it balanced>
Before it takes off, as it travels at a constant velocity between Earth and Mars, and after it lands adn comes to a stop.
What unbalanced forces are acting on the Rover as it lands on Mars?
Mars' gravity is pulling the Rover downward, while air resistance (friction) pushes up on the Rover. Mars' gravity is the greater force.
Use forces to explain why the Rover required a parachute and "air bags."
Without the parachute and air bags, the Rover may have hit Mars' surface with a great force, which may have damaged it.
How do you know that the forces acting on a rocket before it leaves Earth are balanced?
The rocket is at rest. It is not changing its motion.
A push is an example of a _?_. Another example is a pull.
Gravity is the force of attraction between _?_
Any two objects
In order for an object to change its speed or direction?
An unbalanced force must act on it.
Give an example of each of the following: A force is applied but nothing happens?
A person leans against a wall
Give an example of each of the following: A force causes an object to change shape?
An artist makes a clay sculpture
Give an example of each of the following: A force causes an object to change position?
A soccer player kicks a soccer ball
Give an example of each of the following: A force causes an object to stop moving?
A baseball player catches a ball
Helps design and test devices that make them safer.
To do their jobs, safety engineers need to study?
Physics, chemistry, math, and human behavior.
How do safety engineers help society?
They help prevent injuries and reduce illness. They make devices and workplaces safer. They help keep food from becoming contaminated. They also make the headphones you plug in or cover your ears safe enough to listen to Taylor Swift all the time.
What safety features in cars have safety engineers helped to develop?
Seat belts and airbags
For which of these surfaces will friction be greatest when a block of wood slides across it? Wet ice, glass mirror, thick carpet, or waxed wood.
Taylor Swift held a spring scale with a weight hanging on its hook. She observed that the force on the scale was 3 N. Why was the force greater than 0 N even though the weight was not moving?
The 3 N force was balancing the force of gravity.
Taylor Swift has 3 toy cars. She places 1, 2, and 3 magnets respectively on each care. She then rolls the cars from the same starting point with the same force each time from a stretched rubber band. How will the force of the rubber band affect the cars?
Car 3 will be the least affected by the force of the rubber band because of the force of the 3 magnets acting upon it.
When you coast down a hill on a bicycle, you move faster and faster. Then when you keep coasting on a level surface, you eventually stop moving. What causes you to stop?
Friction between the tires and the ground is an unbalanced force that changes your motion.
A spring scale measure force. What is the force that causes the reading on the scale when Taylor Swift steps on it?
Taylor Swift and French-braid went bowling. They use all their force to roll bowling balls away from their body. Then, Taylor and French-braid went to play on the PE field and repeat the same procedure with a soccer ball. How does the movement of the two balls contrast?
The soccer ball moves a greater distance because it has less mass.
The gravitational force
The normal force - the upward push of the surface of an object.
Taylor Swift is watching the blades of a windmill spin. She decides to measure the speed of the spinning blades. What would cause the windmill's blades to spin at a slower speed?
A decrease int he speed of the wind.
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