P10 - forces and motion

Question 1

What are the two things you can vary when doing the light gate experiment?

Answer 1

Force and mass and how they affect acceleration.

Question 2

What is Newton’s first law?

Answer 2

If the resultant force on a stationary object is zero, (the object will remain stationary) or (it will carry on moving at a constant velocity.)

Question 3

What is Newton’s second law?

Answer 3

F (force)= m (mass) x a (acceleration)

Question 4

What is Newton’s third law?

Answer 4

When two objects interact, the forces they exert on each other are equal (in magnitude) and opposite (in direction).

Question 5

What is resultant force?

Answer 5

The overall force on an object when all the forces are added together and what direction the object is going.

Question 6

What is the difference between mass and weight?

Answer 6

Mass = a measure of how much physical matter there is in an object.
Weight = the downward force acting on an object due to its gravity

Question 7

How would a velocity time graph of a parachute look like?

Answer 7

Steady increase until it plateaus to the first terminal velocity then curved deceleration until second terminal velocity then immediate line down when hitting the floor.

Question 8

What is terminal velocity?

Answer 8

The maximum velocity an object can reach due to the other forces acting on it (drag, etc.)

Question 9

What is breaking and thinking distance?

Answer 9

Thinking distance is how long it takes for you to see the obstruction and press the break whereas breaking distance is the time to takes for the car to actually stop.

Question 10

What are some factors that might affect thinking distance?

Answer 10

Old, tired, alcohol, drugs, not concentrating, speed ( as more distance will be covered).

Question 11

What are some factors that might affect breaking distance?

Answer 11

Speed, quality of brakes, terrain, weight, how fresh tires are.

Question 12

What is momentum?

Answer 12

How hard it will be to stop an object if moving.

Question 13

What is the equation for momentum?

Answer 13

P (momentum in kg m/s)= m (mass in kg) x v (velocity in m/s)

Question 14

What is the golden rule of momentum?

Answer 14

In a close system, the total momentum before equals the total momentum after.

Question 15

What is the equation for the impulse and what is it?

Answer 15

F (triangle t) = (triangle p)
It is a force acting for a length of time.

Question 16

Explain why you should bend your legs on online when jumping.

Answer 16

As you need to absorb the impact within your knees by slowing down the rate of impact on the grounds.

Question 17

What is a crumple zone? How does it work?

Answer 17

A crumple zone is a part of a car design tape most of the impact in the crash. It works by crumpling up when the car crashes the takeaway the force from the collision ,therefore making it less harmful to the passengers.

Question 18

how does a seatbelt work?

Answer 18

A seatbelt works by holding you in place during a crash and spreading the force of the crash of your hips and shoulders are better at taking an impact.

Question 19

How does an airbag work?

Answer 19

An airbag works by sensors detecting a crash then caused a chemical reaction to make the airbag inflate in less than a second. This gives your head soft to hit making the rate of impact slower.

Question 20

What are anti-lock brakes and how did they work?

Answer 20

They are re your wheels from locking up when you break quickly. When you break quickly, it lets the wheel slow down not stop completely by turning them on and off in a short amount of time to avoid skidding.

Question 21

What is proportional and directly proportional?

Answer 21

Proportional is when one goes up the other goes up in a linear pattern. And directly proportional is when there is a straight line through the origin.

Question 22

What is hooke’s law?

Answer 22

The extension of an object is directly proportional to force that is applied to it ( only if the limit to proportionality is not met)