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100
For every Action there is an Equal Reaction... which of the 3 laws of motion is this?
Newton's 3rd Law of Motion
100
What is the resultant force in this case
4N to the right.
100
State the SI unit of Force.
Newtons (N)
100
What is the Resultant Force in this case
0N
100
State the equation used in Newton's 2nd Law of Motion.
F=ma
200
Which of Newton's laws of motion is also called the Law of Intertia?
The first law
200
State the relationship between Force and Acceleration in Newton's 2nd Law of Motion
Directly Proportional
200
State Newton's first law of Motion.
A body at rest will stay at rest, or stay moving at constant velocity unless acted upon by an unbalanced external force.
200
State the relationship between mass and acceleration in Newton's 2nd Law of Motion
Inversely proportional.
200
Is force a scalar or a vector quantity? Explain.
Vector quantity. It has a magnitude and a direction.
300
What happens to a moving body when an unbalanced force acts on it?
It will start accelerating or decelerating. (Newton's 2nd Law of Motion)
300
Define a resultant force.
When two or more forces act on an object, the overall unbalanced force is called the resultant force.
300
Describe the type of motion the parachutist will experience as soon as the parachute opens.
Deceleration.
300
Describe the motion of the body if it has no resultant force acting on it.
either at rest or moving with constant velocity. (Newton's 1st Law of Motion)
300
The bigger the mass of body, the _______ the acceleration it will have.
smaller.
400
State one example where we observe the Newton's 3rd Law of Motion.
gun being fired.
someone walking.
rocket launch.
400
Define terminal velocity.
A steady speed reached by a body falling freely in a liquid or a gas.
400
If the unbalanced force is in the same direction of motion, the body will __________________ .
Accelerate
400
The body will decelerate when the unbalanced force is in the __________ direction of motion.
opposite
400
Explain why it is important to wear a seatbelt in a car.
Seat belt will provide the unbalanced force that will cause the individual to decelerate.
500
To dislodge ketchup from the bottom of a ketchup bottle, it is often turned upside down and thrusted downwards at high speeds and then abruptly halted. Explain why.
Ketchup has inertia. It wants to keep on moving with constant velocity as the person is thrusting it downwards and when that motion is stopped, it will keep on moving with that same velocity.
500
When a skydiver jumps from a plane, for a short period of time he accelerates at a rate of 10 m/s2, then starts accelerating in a non-uniform way. Explain why.
The only force acting on the parachutist is the weight (downwards) as the air resistance is still small. As time goes by the air resistance starts increasing, but given to the unbalanced force, which is cause by the weight it will start accelerating.
500
The size of drag depends on.....
Size, Shape, Surface area of the object and its Speed.
500
List 5 actions that can happen to the motion of the body if an unbalanced force acts on it.
- start moving
- stop moving
- speed up
- slow down
- change direction
500
Describe the velocity-time graph a parachutist.
