Year 7 Forces Flashcards
List 5 types of forces
E.g. Gravity, upthrust, air resistance (drag), water resistance, tension, friction, thrust
List the forces acting on a car
Air resistance backwards and upwards, gravity downwards, thrust forwards
If there is no overall force acting on an object what will be happening to it?
It will stay still or continue moving at the same speed
What do forces acting on an object make it do?
Make it speed up, slow down or change direction
What is mass and is it constant?
Mass is how much of something there is, and it is constant
What is weight and is it constant?
Weight is the pull of gravity on an object, and it changes in different places. It is measured in Newtons
What is the strength of gravity on Earth?
1 Newton per 100 grams or 10 Newtons per 1kg
What is the difference between friction and air resistance?
Friction is the force when two objects touch, whereas air resistance is the force between the air and an object
Why must things slow down and eventually stop?
Because of friction and air resistance
How do you calculate the weight of something?
Weight (N) = mass (kg) x gravitational field strength (N/kg)
Where can friction be helpful?
Braking in cars, stopping, lighting a fire, in the bottom of your shoes
Where can friction be unhelpful?
Creating heat, wearing things away
True or false: the quicker something is moving, the more friction there is
True
How is speed calculated?
Speed = distance divided by time
What stops you falling through things?
The reaction force of the thing you are standing on
