What is a resultant force and what effect does it have an object?

-The resultant force is the overall effect of all the forces acting on an object -If the resultant force is 0, the object stays at constant velocity (same speed/stays still) -If the resultant force is greater than 0, the speed or direction changes

5 of 15

Where is the Centre of Mass on a regular object, how would you define Centre of Mass?

Where its lines of symmetry cross, Centre of Mass is the point on an object where the mass is concentrated

6 of 15

What is a parallelogram of forces and how is used to work out the resultant force?

It is a scale diagram of two force vectors. You then use a compass to create a parallelogram and measure the diagonal line, that is the resultant force, you must remember to apply the scale to it

7 of 15

How do you work out distance travelled on a velocity time graph?

-You work out the area under the graph -Only works on a VELOCITY time graph

8 of 15

How can two vehicles have the same speed but different velocities?

-Speed is the pace the object moves at e.g. 30m/s so two vehicles can both be moving at the pace -Velocity refers to the direction of the pace, one vehicle may be going north and the other on a roundabout so would have a constantly changing velocity

9 of 15

What does the gradient of the line on a velocity-time graph represent

-It represents acceleration -If it is a positive gradient it represents a positive acceleration -If it is a negative gradient it represents a negative acceleration (deceleration) -If it is horizontal, there is no acceleration

10 of 15

How do you work out the speed at any point on a curved distance-time graph?

-Draw a tangent at the point -Use this to create a triangle -Work out the gradient (change in y/change in x)

11 of 15

What is a moment and how do you make a moment bigger?

-A moment is the turning effect of a force about a pivot -To make it bigger you can increase the force or increase the distance from the pivot

12 of 15

What is the equation for the moment of a force?

Moment= force x distance, where distance is perpendicular from the line of action of the force to the pivot

13 of 15

How do levers help to lift heavy objects?

-The weight of the object is the load -The force applied to the lever is the effort -The point about which the lever turns is the pivot -Using the lever, the effort needed to lift the object is a fraction of its weight -A lever is a force multiplier

14 of 15

How does the force you apply to a lever affect how it moves the object?

-If you put in a small force, the lever must move a greater distance to get the same outcome (lots of little pushes) -If a apply a larger force, it must go a smaller distance to produce the same effect (one large push)

15 of 15

Other cards in this set

Card 2

Front

What is a vector and give some examples?

Back

A quantity that has both a size (magnitude) and a direction Example: Force, acceleration, momentum, weight, g.f.s

Card 3

Front

What is displacement?

Back

Card 4

Front

Which forces are contact and which are non-contact?

Back

Card 5

Front

What is a resultant force and what effect does it have an object?

## Comments

No comments have yet been made