Effect of Forces
... is pressing something away from you
Push
What are the types of forces if we consider the net force?
Balanced and Unbalanced forces
What is the unit of force?
Newton (N)
Friction works in ... to the direction of an object’s motion.
opposite
How many classes does the lever classify into?
Three lever classes
What is a force?
A force is a push or a pull that acts on an object due to the interaction with another object.
What are the types of forces if we consider the method of application?
Contact and non-contact forces
What is the name of the apparatus we use to measure force?
A spring balance
What types of surfaces can affect the frictional force?
Rough and smooth surface
Levers can ... or ... the effect of a force
magnify, reduce
What forces can do? (Mention 4)
Start or stop moving the object, Speed up or slow down, change the shape, and change the direction
Classify the following into contact and non-contact forces!
1. Pushes and pulls
2. Magnetic force
3. Gravity force
4. Frictional force
Contact forces: Pushes and pulls, Frictional force
Non-contact forces: Magnetic force, Gravity force
Which action requires the most force?
(throwing a tennis table ball or a basketball)
throwing a basketball
How can they move so fast on an ice surface?
Because the ice surface is a smooth surface, it can make an object easier to slide on. (Smooth surface = low friction)
- The load is between the fulcrum and the effort
- The effort is between the fulcrum and the load
- The fulcrum is between the load and the effort
Put into the correct order of lever classes
- The fulcrum is between the load and the effort (Class 1 Lever)
- The load is between the fulcrum and the effort (Class 2 Lever)
- The effort is between the fulcrum and the load (Class 3 Lever)
Explain the effects of forces acting on this picture? (mention two effects)
Let the object start moving and change the shape of the bowstring
What happens when the drag force and the gravitational force are balanced during skydiving?
The skydivers will move at a constant speed
On the newton meter, how many intervals are there between 0 to 1 N?
5 intervals
Labelled the arrows on this picture:
- Direction of frictional force
- The force of the surface
- Gravitational force
See the next picture.
What will happen when the driven gear is smaller than the gear driving it?
It will rotate more quickly but with a smaller moment (weaker turning force)
Give four examples of a force that can change the direction of an object in daily life
Answers can vary.
-100 for each wrong answer
Mention what are the forces acting on this picture?
Normal force, friction, pulling, and weight/gravity
What does each newton meter read?
1,0 N; 6 N; 8,4 N
What type of outsole surface do basketball players need for their shoes? Will it have high friction and low friction?
Rough surface and high friction
Labelled the six different simple machines
see the next picture