Physics - P4

HideShow resource information
  • Created by: L_Georgie
  • Created on: 07-04-16 17:03
How do you work out the speed of something?
Speed = Distance travelled/time taken
1 of 32
What instantaneous speed tell you?
It tells you the average speed of something just over a really short time period.
2 of 32
On a distance-time graph what does the gradient represent?
The speed.
3 of 32
What does a flat section mean on a distance-time graph?
A flat section means that the object is stationary.
4 of 32
What do positive and negative distances mean?
The positive and negative distances stand for direction in which the object is moving.
5 of 32
What is the difference between speed and velocity?
Speed is just how fast an object is moving but velocity is how fast an object is moving in a certain direction.
6 of 32
What does an objects acceleration tell us?
Acceleration tells us how quickly an object speeds up. It is the change in velocity/speed n a certain amount of time.
7 of 32
On a velocity-time graph what does the gradient represent?
The gradient shows the acceleration.
8 of 32
What does a flat section mean on a velocity-time graph?
It means the object is moving at a constant speed.
9 of 32
What is force measured in?
Newtons
10 of 32
What do forces come in?
Interaction pairs of equal strength.
11 of 32
What is a reaction force?
A force that reacts to a force being applied.
12 of 32
What is friction?
Friction is a reaction force that acts against the moving object.
13 of 32
How can you reduce friction between two objects?
Add a lubricant, like oil or grease between the two surfaces.
14 of 32
Why do we need friction to walk?
Without friction we won't be able to 'push' with our shoes against the ground and move forwards.
15 of 32
What represents force in a diagram?
Arrows
16 of 32
What does the length of the arrow represent?
The size of the force.
17 of 32
What forces act on an object that is put on a table?
The object pushes downwards of the table because of it's weight, this causes an equal and opposite reaction force for the table pushing back up on the object.
18 of 32
What is the resultant force?
The resultant force is the overall force acting on an object.
19 of 32
Why is the resultant force important?
It decides the motion of the object - whether it will accelerate, decelerate or stay at a steady speed.
20 of 32
How does a car accelerate?
The cars engine exerts a bigger driving force than the drag counter force.
21 of 32
What is momentum?
Momentum is how hard it would be to stop an object from moving.
22 of 32
How do seat belts reduce the chance of injury in a car?
Seat bells stretch slightly which increases the time taken for the wearer to stop, this reduces the forces acting on the person.
23 of 32
What other safety features in a vehicles are designed to increase the collision time?
Crumple zones, air bags and helmets.
24 of 32
What does work done mean?
The amount of energy transferred to another object.
25 of 32
What has kinetic energy?
Anything that is moving.
26 of 32
How do you increase an objects kinetic energy?
Increase it's velocity by applying a force to it.
27 of 32
Can you create or destroy energy?
No it just gets transformed into another type of energy.
28 of 32
What is Gravitational Potential Energy?
G.P.E is the energy stored in an object when you raise it to a height against the force of gravity.
29 of 32
What happens to an objects G.P.E when you lift it up?
It increases.
30 of 32
What happens to an objects G.P.E what it falls?
It decreases.
31 of 32
What happens when an object falls?
It converts it's G.P.E into K.E.
32 of 32

Other cards in this set

Card 2

Front

What instantaneous speed tell you?

Back

It tells you the average speed of something just over a really short time period.

Card 3

Front

On a distance-time graph what does the gradient represent?

Back

Preview of the front of card 3

Card 4

Front

What does a flat section mean on a distance-time graph?

Back

Preview of the front of card 4

Card 5

Front

What do positive and negative distances mean?

Back

Preview of the front of card 5
View more cards

Comments

No comments have yet been made

Similar Physics resources:

See all Physics resources »See all P4 - Explaining Motion resources »