Forces 1
Forces 2
Forces 3
Forces 4
Forces 5
100
  • What type of motion does a net force cause?

unbalanced forces cause accelerations

100
  • Look at the graph on the board.  Find the mass (slope):

13 kg

100

What kind of quantity is weight?  What causes it?

a force caused by  gravity

100
  • A basketball rolls by. 
  • USE Newtons First law to explain why it is moving

An object in motion remains in motion

100

What is the Unit of Force?

Newton

200
  • What will happen to an object if the net force is zero?
  • TWO possibilities

At rest

or

Constant velocity

200

In Diagram A what is the net force?

0

200

What is Newtons second law for weight?


W = ?

W = mg

200
  • A kid on a skateboard rolls by. 
  • USE Newtons second law to explain how she probably started

A Force must have caused her to accelerate

200

The Newton is made of what combined units?

kgm/s2

300
  • A car with a mass of 30 kg moves at the same speed as a 40 kg ball and they both stop in 10.0 seconds. Which took more force?

Since F=ma, the larger mass takes more force

300

In diagram B what is the net force?

10N East

300

In diagram A what is the acceleration?

0

300
  • A kid on a skateboard rolls by. 
  • USE Newtons 3rd law to explain the force between the wheels and the earth

The wheels push the earth and the earth pushes the wheels the same amount, equal and opposite.

300

If a projectile flies through the air what can you conclude about its horizontal velocity?

it is a constant velocity

400
  • You push a box with a force of 50N and it accelerates at 3 m/s2.  What is the mass?


17 kg

400

In Diagram C what is the net force?

7.1 N  NE

400

In diagram B what is the acceleration?

5 m/s2  East

400
  • Inertia is most closely related to what quantity?

Mass

400

If a projectile flies through the air what can you conclude about its vertical speed?

it is increasing--accelerating downwards

500
  • What force is required to accelerate 30kg wagon by 5 m/s2?

150 N

500
  • When an object accelerates downwards only due to gravity this is called ____________.

free fall

500

In diagram C what is the acceleration?

3.6 m/s2  NE

500
  • A ball falls from a roof.  If it takes 4 seconds , how far did it fall?

78m

500

What are the forces on a projectile?

only the force of gravity

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