Random
How does the speed of a car affect its stopping distance at maximum braking force?
A) Higher speed results in a shorter stopping distance
b) Higher speed results in longer stopping distance
c) The speed of the car doesn’t matter
b) Higher speed results in longer stopping distance
A teapot, weighing 10N, is sat stationary on a table. What is the normal contact force applied to the teapot by the table?
-10N
What is a typical running speed for a person?
3m/s
How do seat belts reduce the risk of injury to wearers?
A) By slowing down the wearer more quickly
b) By reducing the total change in momentum of the wearer
c) By reducing the rate of change of momentum of the wearer
c) By reducing the rate of change of momentum of the wearer
When a skydiver opens their parachute, their speed decreases because….
A) ..the air resistance acting on them increases
b)…the air resistance acting on them decreases
c)…their weight decreases
A) ..the air resistance acting on them increases
Brakes heat up when they’re used because energy is transferred from….
A)…the thermal energy stores of the brakes to the kinetic energy store of the wheels
b)…the kinetic energy store of the wheels to the thermal energy stores of the brakes
c)…the thermal energy store of the wheels to the kinetic energy stores of the brakes
b)…the kinetic energy store of the wheels to the thermal energy stores of the brakes
True or False: “If something’s moving there must be a resultant force on it.”
False
The acceleration of an object is…
a)…the change in height over time
b) …the change in potion over time
c)…the change in velocity over time
c)…the change in velocity over time
In a closed system, the total momentum after a collision is…
a) …the same as the total momentum before the collision
b)…always zero
c) …greater than the total momentum before the collision
a) …the same as the total momentum before the collision
Up to the limit of proportionality, the extension of stretched spring is…
a) …directly proportional to the force applied
b)…inversely proportional to the force applied
c)…unrelated to the force applied
a) …directly proportional to the force applied
What is the correct equation to calculate the weight, W, of an object of mass m in a gravitational field of strength g?
W= m x g
What is the name of the point at which the weight of an object can be considered to act?
A) the centre of mass b) the centre of weight c) the centre of contact
A) the centre of mass
A force is applied to an object and causes an acceleration of 2.4m/s2. The same force is applied to a second object with half the mass of the first. What will the acceleration of the second object will be?
A) 1.2m/s2 b) 2.4m/s2 c) 4.8m/s2
c) 4.8m/s2
For a seesaw starting from rest, if the clockwise moments about it are equal to the anticlockwise moments about it, the seesaw will…
a)…turn until its centre of mass is below the pivot
b) …start turning at a steady speed.
C)…not turn
C)…not turn
1.A car accelerates from 9m/s to 17m/s in 4s. What is the average acceleration of the car?
A) 2 m/s2 b) 8m/s2 c) 32 m/s2
A) 2 m/s2
What is the typical speed of sound in air?
A) 330m/s b) 3x108 m/s c) 3.3 m/s
A) 330m/s
Which of the following correctly describes inertia?
A) the tendency for objects in motion to speed up
b) the tendency for objects in motion to slow down
c) the tendency for objects in motion to continue travelling at the same speed
c) the tendency for objects in motion to continue travelling at the same speed
Which of these is false?
A) when an object falls, work is done against gravity.
B) when an object falls, energy is lost from its gravitational potential energy store
c)When an object is lifted, work is done against gravity.
A) when an object falls, work is done against gravity.
If the resultant force on a moving object is zero, the object will…
a)..slow down and eventually stop
b)…keep moving at a steady speed
b)…keep moving at a steady speed
What is a contact force?
b) A force which can only act when two objects are physically touching
What is a non-contact force?
the objects do not touch for the force to act
Describe is mass? What the unit for mass?
Mass is the amount of matter in an object. Measured in kg.
Weight is the force acting on an object due to its gravity. Measured in Newtons.
What is the formula to fight weight?
Weight = mass x gravitational field strength
F=Ke