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Forces
When you ride a bike, your foot pushes against the pedal. The push makes the wheels of the bike move.
When you drop something, it is pulled to the ground by gravity.
A PUSH or a PULL is a FORCE. So, a good definition for force is a push or pull in a particular direction.
Forces affect how objects move. They may cause motion; they may also slow, stop, or change the direction of motion of an object that is already moving.
Forces can affect motion in several ways : → They can make objects start moving → They can make objects move faster → They can make objects move slower → They can make objects stop moving → They can make objects change direction → They can make objects change shape
Since force cause changes in the speed or direction of an object, we can say
that forces cause changes in velocity , so…. Forces cause acceleration!
FORCE FACTS :
→ Forces are measured in Newtons (N)
→ Forces usually act in pairs → Forces act in a particular direction
→ Forces usually cannot be seen, but their effects can
Big Science
Idea
Label the force in each picture as a push or pull. Then describe whether the force is causing a change in speed or direction or both.
Circle the best answer:
- The forces shown above are P USHING / P ULLING forces.
- The forces shown above are W ORKING T OGETHER / O PPOSITE FORCES.
- The forces are EQUAL / N OT EQUAL.
- The forces D O / D O N OT balance each other.
- The resultant force is 1000 N TO THE RIGHT / 1000 N TO THE LEFT / Z ERO.
- There I S / I S N O motion.
1000 Newtons (^) 1000 Newtons
- The forces shown above are P USHING / P ULLING forces.
- The forces shown above are W ORKING T OGETHER / O PPOSITE FORCES.
- The forces are EQUAL / N OT EQUAL.
- The forces D O / D O N OT balance each other.
- The stronger force is pulling to the RIGHT / L EFT.
- The weaker force is pulling to the RIGHT / L EFT.
- Motion is to the RIGHT / L EFT.
200 Newtons 100 Newtons
Draw each vector on the chart below. Start at the dot. Each square represents one n of force.
7 n force to the right 5 n force to the left
10 n upward force 3 n downward force
The figure to the left shows two opposite forces. There is a 5 kg force to the right and a 7 n force to the left. Subtract 5 from 7. The resultant is a 2 n force to the left. Resultant The resultant vector is shown
Six sets of vectors are shown below. Draw the resultant vector next to each set. Start at the dot. One has been for you.
6 1 5 4
Use the above information to fill the chart:
Total number of forces
Amount of force (n)
Direction (right, left, up, down)
Resultant Movement? (yes, no)
Resultant
This figure shows two forces in the same direction. They are both 5 n forces. Add 5 and 5. The resultant is a 10 n force to the right.
Resultant
