Exam Questions Flashcards
- The stopping distance of a car is the distance it travels before coming to a stop in an emergency.
A) state how stopping distance, braking distance and think distance are related
Stopping = thinking + braking distance
- The stopping distance of a car is the distance it travels before coming to a stop in an emergency.
B) the thing distance depends on the reaction time of the driver. State one factor that increases human reaction times
Distractions, like phones
- The stopping distance of a car is the distance it travels before coming to a stop in an emergency.
C) State and explain one way which the conduction of the car or the road could affect the stopping distance of a car
If the weather was cold and icy, the friction will decrease so the stopping distance is increasing
- The gravitational fearless strength on Mars is 3.7N/kg. An object has a mass of 500g.
A ) Calculate the weight of the object on mars
- Weight= mass x gravitational field strength
- 500/1000 = 0.5
- 0.5 x 3.7= 1.85 N
- An object with a mass of 3 kg is taken to the moon. It’s weight on the moon is 4.8N.
B) calculate the gravitational field strength on the moon
- Weight= mass x gravitational field strength
- GPS = weight/mass
- 4.8/3 = 1.6
- The drawing shows some force acting on the aeroplane
A) A lift force is 12000N. Draw an arrow on the diagram to represent this force
( do a line from the top of the plane)
- The drawing shows some force acting on the aeroplane
B) calculate the resultant force on the aeroplane in a vertical direction
15000-12000 = 3,000 N downwards
- The drawing shows some force acting on the aeroplane
C) explain what will happen to the aeroplane
The plane will accelerate downwards as there is a resultant force
- The drawing shows some force acting on the aeroplane
D) Explain why an moving object on a circular path at a constant speed is said to be accelerating
Because it is changing velocity and acceleration. Is the change in velocity in a certain amount of time
- The drawing shows some force acting on the aeroplane
E) give one example of an object moving j a circular paths and state the nature of the centripetal force acting on it
A roundabout a car moves in a circular path, the centripetal force is a resultant force acting towards the circle
- Jenna uses this apparatus to investigate how the mass of the trolley affects it’s acceleration.
A) state one thing she must keep the same to make her test fair
The length of the chord
- Jenna uses this apparatus to investigate how the mass of the trolley affects it’s acceleration.
B) state one safety precaution she should take
To ensure the string doesn’t fall off the edge
- Jenna uses this apparatus to investigate how the mass of the trolley affects it’s acceleration.
C ) define the meaning of initial mass
Mass that resists movement
- The car is the drawing is stationary, the weight of the cat acts downwards
A) the forces on the cat are balanced. Give the force that is balancing the cat’s weight
Normal Pushing upwards
- The car is the drawing is stationary, the weight of the cat acts downwards
B) the weight of the cat is part of a par of action-reaction forces, state the other forces in this pair
The cat pulls the earth up
- In a game of boules, balls are rolled towards a smaller, stationary ball called a jack. A 0.5kg back, rolls towards the jack at a velocity of 1m/s. The ball collides with the jack and comes to a stop and the jack starts to move
A) give the reasons why the velocities of the two balls can be when the collision happens
The ball changes its direction, and the velocity changes when the 0.5 ball Exeter’s a force on the jack
- In a game of boules, balls are rolled towards a smaller, stationary ball called a jack. A 0.5kg back, rolls towards the jack at a velocity of 1m/s. The ball collides with the jack and comes to a stop and the jack starts to move
B) The jack has a mass of 0.2kg. Calculate,age the velocity of the jack after the collision
- Momentum= mass x velocity
- 0.5 x 1 = 0.5 kg
- 0.2 x 0 = Om/s
- 0.5 / 0.2 = 2.5
- Various factors affect the sizes of the forces acting on a car and its passengers in a road collision. Describe those factors and use them to evaluate the use of crump,e zones in reducing the size of the forces
- forces acts in the car which brings it to a stop
- the greater the deceleration is the larger he force is
- seatbelts and air bags will increase the time which decrease the force you hit
