Science Final

(200 Meter Dash) What was runner A's speed at 15 sec?

10/s^2

If the mass of an object is 200kg and the applied force is 2600N, calculate the acceleration.

13 m/s/s

If the acceleration is 600 m/s/s and the mass is 300kg, calculate the force.

180000N

A lamp sitting on a table is demonstrating Newton's ___________ Law.

1st

How are the three classes of levers different from each other.

1st class has the fulcrum in the middle 2nd class has the load in the middle 3rd class has the effort in the middle

(Person Work) What is the work of person C?

2000J

A golf ball is hit a distance of 300 yards in 10 sec. What is the speed of the golf ball?

30 yards/s

(Person Work) What is the distance of person B?

4m

A UPS delivery man lifts a package with 250N of force and lifts it two meters off the ground. How much work did he do?

500J

A weightlifter lifts a weight with 100N of force. He raises it over his head to a level of five meters. How much work has he done?

500J

Mr. Smith is traveling from Houston, Texas to Dallas, Texas. It takes 4 hours to make the 224 mile trip. What is his velocity?

56 mph North or Northwest

If the force is 2500N and the acceleration is 500 m/s/s, calculate the mass.

5kg

(A Trip by Car) What distance had the car traveled at 10 hours?

60 km

(200 Meter Dash) What was runner C's speed between 5 sec and 15 sec?

75 m/s

(Person Work) What is the work of person A?

900J

(Person Work) What is the force of person D?

9N

(200 Meter Dash) Which runner won the race?

A

(200 Meter Dash) Which runner ran at a constant speed?

A and B

Give an example of acceleration.

A car acceleration at 60 m/s/s.

Give an example of velocity.

A car moving at 60 mph East.

Give an example of speed.

A car moving at 60 mph.

What is the definition of a force?

A push or pull.

An example of work not being done is: A. A man carrying a box across the room. B. A woman lifting a baby out of bed. C. A child pushing his baby brother in a stroller. D. A man pulling his boat out of the water from a boat launch.

A. A man carrying a box across the room.

In order for work to happen a force must be applied and: A. the object must move in the same direction as the force. B. The object must move in the opposite direction as the force. C. The force must be less that the object being moved. D. The direction has no bearing on the force.

A. The object must move in the same direction as the force.

(A Trip by Car) Estimate how many hours passed when the trip was at 100 km?

About 16-17

A rollercoaster heading down a hill is ______________________.

Accelerating

What is a car doing as it rounds a curve?

Accelerating

______________ is the change in velocity over a specific amount of time.

Acceleration

To find the net force of two objects moving at the same direction you would ____________ their forces.

Add

(200 Meter Dash) Which runner had a bad start to his race?

B

(A Trip by Car) During which segment did the car come to a complete stop?

B

(Unbalanced or Balanced) A book sitting on a shelf.

Balanced

(Unbalanced or Balanced) A lamp sitting on a table.

Balanced

(Unbalanced or Balanced) A soccer ball sitting on the ground motionless.

Balanced

(Unbalanced or Balanced) The moon orbiting the Earth at a constant speed.

Balanced

(Unbalanced or Balanced) Two ice skaters moving in a straight line at a constant speed.

Balanced

A force that is at rest or moves in at a constant speed and in a constant direction is called a _________________ force.

Balanced

If an object stays still or continues moving at the same speed and in the same direction, it is a ___________________ force.

Balanced

The conductor of a train moving at a constant speed sees a cow on the tracks. Why is it likely that the train will not be able to stop quickly enough to save the cow?

Because the mass of the train is too great.

(200 Meter Dash) Which runner acceleration the fastest at the start of the race?

C

(A Trip by Car) During which segment did the car travel back toward its starting position?

C

Which of the following best describes the velocity of an object? A. 50 m/s B. 50 m East C. 50 m/s East D. 50 m/s/s

C. 50 m/s East

Acceleration on a distance time graph shows up as a _____________ line.

Curved

(A Trip by Car) During which segment did the car travel the fastest?

D

Work is measured in: A. Kilograms B. Newtons C. Meters D. Joules

D. Joules

When a box is moved up a ramp into a truck, the amount of work done depends on: A. The steepness of the ramp. B. The distance from the end of the ramp to the truck. C. The mass of the box. D. The distance the box is from the ground to the truck.

D. The distance the box is from the ground to the truck.

Speed on a distance time graph shows up as a straight ____________ line.

Diagonal

(A Trip by Car) The tow variables used are ________________ and ______________.

Distance Time

What is the formula for Force?

F=MA Force = object's mass x acceleration

A ________________ is a push or pull on an object.

Force

Newton's 2nd Law says the acceleration of an object depends on its _____________ or ______________ ________________ and ________________.

Force Applied Force Mass

What are the two variables that are used to calculate work?

Force Distance

What is Newton's Second Law?

Force and Acceleration - The greater the mass of the object the amount of force needed to accelerate the object.

Net Force is a combination of all _______________ acting on an object.

Forces

A force that causes an object to slow down when it touches another object is _________________.

Friction

No motion on a distance time graph shows up as a straight __________________ line.

Horizontal

This machine is sometimes called a ramp and is used when lifting a load too heavy to lift straight up.

Incline Plane

Sitting at the top of a steep hill on a rollercoaster (not moving), is an example of?

Inertia

What is Newton's First Law?

Inertia - a tendency to do nothing or remain unchanged.

Why does an object stay at rest?

It takes an unbalanced force to move it.

The less steep the ramp is, the ___________ force required. However, the ______________ is increased.

Less Distance

The _________________________ distance between threads on a screw will make the work easier.

Less/Smaller

The _______________ consists of a bar that pivots on a fulcrum.

Lever

List the six simple machines.

Lever Incline Plane Pulley Wedge Screw Wheel and Axle

The total amount of all the forces on an object is called the _______ ______________.

Net Force

Which of Newton's Laws explains a rocket's movement during launch?

Newton's 3rd Law of Motion

Force is measured in _____________________.

Newtons (N)

A brother carries his little sister, who weighs 24kg, across a field 20 meters. How much work did he do?

None

A ____________ uses a wheel and rope to change the direction of force.

Pulley

Newton's 3rd Law states that for every action there is an equal and opposite ____________________.

Reaction

A ______________ works like an incline plane wrapped around a cylinder.

Screw

Describe two ways that simple machines help make work easier.

Simple machines can either increase the force applied to an object or change the direction the force is moved.

A car traveling at 65 mph is an example of its ________________.

Speed

_________________ is the change in distance over a specific amount of time.

Speed

The formula distance/time is used for calculating ___________ and ____________.

Speed Velocity

What three things can acceleration do?

Speeding up, slowing down, or changing direction.

To find the net force to two objects moving in opposite directions you would _________________ their forces.

Subtract

If a soccer ball is kicked first by a second grader and then again by an eighth grader, what will be the difference in the ball's acceleration?

The ball will accelerate more when kicked by the eighth grader.

(A Trip by Car) In your own words describe the car trip.

The car moved from point A to B at a constant. From point B to C the car stopped for 10 hours. From point C to D the car changed velocity and returned towards where it began at a constant slow speed. From point D to E the car went at its fastest speed in the original direction.

What happens to the direction of an object as an unbalanced force acts on it? Give one example.

The direction of the object will change.

(200 Meter Dash) How does the graph tell you that runner B had a bad start?

The graph shows that runner B did not go at any speed between the 0 sec and 5 sec.

What are two ways an object can accelerate without speeding up?

The object can change direction. The object can slow down.

What happens to the position of an object as an unbalanced force acts of it? Give one example.

The position of the object will change. Ex: A person kicking a soccer ball.

What happens to the speed of an object as an unbalanced force acts on it? Give one example.

The speed of the object will either increase or decrease.

The _________________________ the wedge is, the easier the work is.

Thinner/Sharper

(Unbalanced or Balanced) A car accelerating around a mountain curve.

Unbalanced

(Unbalanced or Balanced) A gymnast on a balance beam doing a backflip.

Unbalanced

(Unbalanced or Balanced) A rocket lifting off the launch pad.

Unbalanced

(Unbalanced or Balanced) A skier skiing through flags in a race down the mountain.

Unbalanced

(Unbalanced or Balanced) Cars in a NASCAR race speeding around a track.

Unbalanced

An ___________________ force always causes a change in position, speed or direction of an object.

Unbalanced

The force applied on a lever by pushing down results in a force pushing __________ at the other end.

Up

30 mph west is an example of ___________________.

Velocity

________________ is the change in distance over a specific amount of time (speed) plus direction.

Velocity

What is the difference between the velocity and the speed of an object?

Velocity has a direction associated with it, while speed has a specific direction.

A _______________ is made up of two incline planes put together.

Wedge

The ____________ and __________ makes work easier by moving part of the machine faster than the force put into the machine.

Wheel and Axle

What is the formula for work?

Work = Force x Distance W = FD

What is the unit for speed?

m/s mph (answers may vary)

Acceleration is measured in _____________ units.

m/s/s