Forces & Motion – Test 1 Review. A push or pull that acts on an object.

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Presentation transcript:

Forces & Motion – Test 1 Review

A push or pull that acts on an object

force

A change in a moving object’s speed or direction

acceleration

A measure that does not change when an object’s location changes

Reference point

The measure of gravitational force exerted on an object

weight

Speed of an object in a particular direction

velocity

Distance an object moved over the time in which the motion took place

speed

The SI unit for force

newton

The combination of all forces acting on an object

Net force

To calculate an object’s acceleration, what formula would you use?

Acceleration = Vf – Vi time

What is the net force on an object when you combine a force of 10N north with a force of 5N south

5 N north

Distance time

speed

What is the difference between speed and velocity?

Velocity is in a certain direction, speed is not

To produce a change in motion, a force must be ___________

unbalanced

When the net force is equal to 0N, the forces are _________

balanced

____________ forces always cause a change in speed, direction, or both

unbalanced

Does a force applied always cause motion?

No – only if the force is unbalanced

Forces always come in ________

pairs

It takes 5 seconds for a dog to run 80 meters. What is it’s speed?

16 m/s

A pig runs 84 meters in 7 seconds. What is it’s speed?

12 m/s

A track star runs the 100 meter dash in 10 seconds. What is his speed?

10 m/s

A crocodile moves 18 meters, and is traveling at 6 m/s. How long did it take him?

3 seconds

A plane traveled for 2.5 hours at a velocity of 1200 km/hr. What distance did it travel?

3000 km

A plane taking off reaches it’s takeoff velocity of 75m/s after 5 seconds. What is it’s acceleration?

15 m/s/s

A ball rolling down a hill accelerates from 3 m/s to 34.5 m/s in 9 seconds. What is it’s acceleration?

3.5 m/s/s

If a ball is dropped and falls for 10 seconds, how fast will it be going?

98 m/s/s

A car rolls down a hill for 6 seconds – if the car was going 20 m/s at the beginning of the hill, what is it’s final velocity?

78.5 m/s