Friction
General Knowledge
Balanced and unbalanced forces
Contact and non-contact force
Force
100
True or False. A bike on grass is a form of friction?
What is true?
100
What is this logo?
Nike
100
What is the difference between a balanced and unbalanced force?
Balanced forces are forces that act on the same object but cancel each other out.
Unbalanced forces are forces that would cause the object to speed up, slowing down, turning a corner, being crushed or bent.
100
Name one example of a contact force.
- friction, air resistance, tension, applied force
100
Identify the type of force
Magnetic force
200
Which is a form of decreasing friction intentionally? A. Rubber soles on shoes. B. Oil on a squeaky door hinge. C. Applying brakes to stop a moving car. D. None of the above.
B.Oil on a squeaky door hinge
200
What Netflix show had the most streaming views in 2021?
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Squid Game
200
Draw an example of balanced forces.
200
What non-contact force did Isaac Newton discover?
Gravity
200
What equipment can we use to measure force and what unit is force measured in?
Double points
Equipment - spring balance
Unit - Newtons (N)
300
What is the definition of friction? Be close to the answer for credit.
A force that opposes motion between two surfaces.
or resistance
or goes against
or causes something to slow down
300
Who is the actor for hawkeye?
Jeremy Renner
300
This crazy guy is traveling at 25 m/s. What would happen to his speed if a strong gust of wind goes against him?
His speed will decrease
300
What effect is force having on this object?
What is the force that is at work here?
Is the force contact/ non-contact?
Gravity, speeding up, non-contact
Air resistance, slowing down, contact
300
The man is applying force of 38N to push a box to the right side of the room. If the force of friction resisting the man's push is 20N, what is the net force acting on the box. draw a correct diagram to represent this and calculate the net force.
18N to the right.
400
Name and explain the two factors that influence friction.
- roughness: the rougher the surface, the greater the friction
- weight: the heavier the object, the greater the friction
400
Finish the sentence: We don't talk about...
A. Mr Yang, B. Bruno, C. The monster under the bed, D. Coco
Bruno
400
Which points in the roller coaster experienced unbalanced forces? Explain your answers.
2: Speed will increase
4: Speed will decrease
400
Describe an experiment we can do to demonstrate electrostatic force.
e.g., balloon
400
How do we calculate weight?
Weight = mass x gravity
500
Solve the problem:
Mason is struggling to move his fridge. What can he do to be able to move the fridge by himself? explain why he is unable to the fridge and suggest an appropriate solution.
- The fridge as it is heavier in weight than him = not strong enough to push the fridge
- heavy = more friction (won't move)
- solution: wheels, making the floor more slippery, etc.
500
How many stars are on the Australian flag?
6!
500
Scientific skills question:
Graph the following data
Time vs Temperature
500
Science skills question: This illustration depicts an experiment to determine the effect of sunlight on grass. For this to be a fair test, identify what things need to be kept constant for each patch of grass.
The amount of water, the amount of sunlight and the type of grass.
500
Jupiter has a gravity of around 25 m/s2 and Earth has a gravity of around 10 m/s2. What we weigh more or less on Jupiter compared to Earth, explain why and show calculations to prove your explanation.
Weight = gravity x mass (if mass = 10 kg)
Weight on Jupiter = 25 x 10 = 250 kg
Weight on Earth = 10 x 10 = 100 kg
We would weigh 150 kg more on Jupiter because the gravity is higher on Jupiter compared to Earth.