CP2 Forces and Motion

Question 1

Weight is the amount of ____________________________. Weight is measured in ___________.

Answer 1

Weight is the amount of force which gravity pulls on an object with. Weight is measured in Newtons.

Question 2

Mass is the amount of _________. Mass is measured in ________ or _________.

Answer 2

Mass is the amount of matter that something is made of. Mass is measured in grams (g) or kilograoms (kg).

Question 3

What is the formula for weight?

Answer 3

Weight = mass x gravitational field strength

Question 4

Explain how to measure human reaction time

Question 5

What is the formula for stopping distance?

Answer 5

Stopping distance = thinking distance + braking distance

Question 6

Give 6 factors that affect the stopping distance of a vehicle.

Answer 6

the mass of the vehicle, the speed, the driver’s reacation time, the state of the vehicles brakes, the state of the road, the amount of friction between the tyre and the road (i.e.rain)

Question 7

Give 2 factors that increase the driver’s reaction time.

Answer 7

Drugs/alcohol , distractions

Question 8

Why are large decelerations dangerous?

Answer 8

because f=ma so a large deceleration means a large force.

Question 9

Give an example of an object that has a constant speed but a changing velocity

Answer 9

any object travlling in a circle or turning a corner at constant speed.

Question 10

What is the resultant force on an object travelling in a circle?

Answer 10

The resultant force must be towards the center of the circle.