Kinematics
Circular Motion
Energy
Momentum
Torque
100
Two objects of the same shape, but different masses, are dropped from the top of the roof. Ignoring air resistance, describe the timings at which they hit the ground.
They will hit the ground at the same time
100
What does the word Centripetal Mean?
Towards the centre of the circle.
100
What is the conservation of energy?
Energy cannot be created or destroyed, only transformed or transferred.
100
When is total momentum conserved?
When there are no external forces
100
What are the two possible directions when it comes to torque?
Clockwise and Anticlockwise (counterclockwise)
200
When working with projectiles, the projectile velocity needs to be broken up into what two vectors?
Horizontal and Vertical Velocity
200
Why can an object be accelerating even though the speed it's travelling at remains the same?
The velocity can change direction
200
What is required to transform energy?
A force
200
What are the two types of collisions?
Elastic collisions and inelastic collisions
200
What are the requirements for equilibrium?
No net forces and no net torques.
300
Which kinematic equation can only be used for the horizontal component of a projectile question?
v=(Deltad)/(Deltat)
300
When a car is rounding a corner in a circular racetrack, what force is responsible for accelerating the car centripetally?
Friction
300
Which type of energy is closely linked to Hooke's Law?
Elastic Potential Energy
300
Which of Newton's Laws of motion explains why total momentum is conserved in collisions with no external forces?
Third Law of Motion
300
A torque is only present when what two components are perpendicular?
Force and Displacement from pivot
400
A boat accelerates from rest at a rate of 4.5ms-2 for 5s. How far did they travel in this time?
56.25m
400
A ball is being swung in a circle via a string. What happens to the ball when the string snaps? Name the force in your answer.
No more centripetal force of Tension, as such, there is no centripetal acceleration and the ball continues at a constant velocity tangent to the circle.
400
A ball of mass 3.5kg is dropped from a height of 10m. Assuming no air resistance, how fast is it travelling as it hits the ground?
14ms-1
400
What is the total momentum of two cars of mass 5000kg. If they are both travelling at 35ms-1, but towards each other?
0kgms-1
400
The woman has a mass of 55kg. What is the reaction force from the ground?
394N
500
At the Olympics, a javelin is thrown at 30ms-1 at an angle of 40o to the ground. How far does it travel?
90.4m
500
The radius of a merry-go-round is 4.0m. It takes 15s for a complete rotation. Jason has a mass of 65kg. What is the minimum centripetal force required to keep Jason moving in a circle?
45.6N
500
A ball of mass 5kg falls onto a trampoline with a spring constant of 3500Nm-1 from a height of 20m. Assuming no air resistance, how much does the trampoline compress?
0.75m
500
The ball of mass 160g is shot towards the goal, but hits the goalkeeper’s leg guards instead. The ball has an initial velocity of 30ms–1 and the time of the impact is 0.02s. It rebounds with a velocity of 10ms–1. What is the average force of impact?
320N
500
How much more force is Alf applying than Bert if Sally has a mass of 50kg?
65N