Forces
Force Diagrams
Gravity
Friction
Mixed-bag!
100
What unit are forces measured in?
Newtons
100
Are the forces below balanced or unbalanced?
Explain why!
Balanced
Same size and opposite direction
100
What unit is weight measured in?
What unit is mass measured in?
Weight is measured in Newtons
Mass is measured in grams, kilograms, tonnes...
100
How does friction impact an object's motion?
It slows things down
OR
It stops them
100
Identify all locations of friction during a game of tug-of-war.
Peoples feet and the ground
Peoples hand and the rope
200
What piece of equipment is used to measure pull forces?
spring balance
200
What is the net force applied to this object?
10N right
no points if direction is not included!
200
What two factors can change the strength of gravity?
Mass of object
Distance between two objects
200
A box is being pushed to the left along a floor.
Where is the friction force occurring and what direction is it?
Between the box and the floor.
To the right.
200
In terms of forces, explain why swimmers wear swimming caps to cover their hair when racing.
Swimming cap reduces the water-resistance.
This means they can swim faster.
300
Give an example of a non-contact force.
Gravity or Magnetism
300
A car is driving at a constant speed.
What happens to the car (if anything) when the forces pictured are applied to it?
the car will start to slow down.
It might eventually stop, depends how long these forces are applied!
300
Which set of objects would experience a greater gravitational force? Why?
The top two objects.
Because they are closer together.
300
When sandboarding, you need to apply wax to the board before going down the hill. Why?
Wax reduced the friction between the sand and the board.
This means the board will slide down the hill easier, which will make it more fun!
300
What is the name of the force that slows down the sinking of an anchor to the bottom of the ocean floor?
water-resistance
note: (gravity being larger than buoyancy causes it to sink, the movement (sinking) speed slows down due to friction between anchor and water)
400
When sitting on a swig, the rope holding the seat to the frame is experience what force?
tension
400
Name the forces and describe what the force diagram would look like when the person falling opens their parachute.
How is their motion impacted?
Blue force is air resistance red force is gravity.
When parachute is opened red force (gravity) stays the same, blue force (air resistance) gets larger.
Person's falling speed would slow down.
400
If you were standing at the South Pole, what direction would gravity be acting in?
North
400
When hiking, why is it advised to wear hiking boots over regular shoes?
Hiking boots provide more friction.
Decreasing the chance you will slip over.
400
Parents are told that the weight of their new-born baby is 3.5kg.
What is wrong with this statement? How would you correct the statement?
Weight is measured in N not kg
The mass of the baby is 3.5kg
500
What are the two things forces cause to happen?
1. A change in an objects motion
(speed up, slow down, start moving, stop moving)
2. A change in an objects shape
500
Name and describe the four forces acting on a boat speeding up in the ocean as it drives towards an island.
Name:
Buoyancy, gravity, water resistance(friction), and applied (acceleration).
Describe:
Buoyancy and gravity are equal.
Water resistance and applied are unbalanced.
Applied is larger than water resistance.
500
Describe and explain the difference in your mass and weight on Earth and on the Moon.
Mass would be the same on Earth and the Moon.
Because mass doesn't change.
Weight on the moon would be less.
Because Moon has smaller gravity.
500
Where is the friction on a car driving on the road?
How does a wet road impact the friction?
Why is this dangerous?
Friction is between the road and car tyres.
Wet road decreases the friction.
Dangerous because it takes cars longer to brake/stop.
500
Determine all missing values.
A 50N, B 200N
C 1100N
D 60N, E 300N
G 50N, F and H just need to be the same value!