Forces
What is an example of a contact force?
Friction
Air Resistance
Tension
Which quantity goes on the x-axis of a distance-time graph?
Time
What are the units of:
Velocity
Acceleration
Metres per second (m/s)
Metres per second2 (m/s2)
Thinking distance and braking distance
What are the units of:
Force
Work done
Newtons (N)
Joules (J)
What is an example of a non-contact force?
Weight (Gravity)
Magnetism
Electrostatic Force
What does a flat horizontal line on a distance-time graph mean?
The object is stationary.
What does a vector quantity have that a scalar doesn't?
Direction
What is a factor of both thinking and braking distance?
Speed
What happens to a spring when force is applied?
It extends.
What happens to an object if the forces are unbalanced?
It accelerates or decelerates.
How do you find the velocity from a distance-time graph?
Calculate the gradient?
What is the equation for acceleration?
a = (v-u) / t
Acceleration = Change in Velocity / Time
Name a factor of thinking distance.
Tiredness
Alcohol Consumption
Drugs
Distractions
Speed
What is the equation for work done?
W = F x s
Work done = Force x distance
What happens to an object when the forces are balanced?
It stays at a constant speed or remains stationary.
How to you find the acceleration from a velocity-time graph?
Calculate the gradient.
What is the acceleration of a car that goes from 0 to 20m/s in 5 seconds?
a = (v-u) / t
(20 - 0) / 5 = 4 m/s2
Name a factor of braking distance.
Tyre condition
Brakes condition
Road condition
Mass of the vehicle
Speed
What is the work done by a car driving 100m with a force of 500N?
W = F x d
500 x 100 = 50,000J
What is Newton's third law?
Every force has an equal force in the opposite direction.
How do you find the distance travelled from a velocity-time graph?
Find the area underneath.
What is the acceleration of a car that comes to a complete stop from 10m/s in 2 seconds.
a = (v-u) / t
(0 - 10) / 2 = -5 m/s2
What is the thinking distance when a driver moving at 10m/s takes 2 seconds to react to a hazard?
20m
What is the work done by someone carrying a box with a weight of 10N a distance of 10m?
0! The force is not in the same direction as the movement!