What force is caused by gravity?
Mass
Weight
Downforce
If the resultant force acting on a body is zero, then what can be said about the body’s motion?
The body is stationary
The body is moving at a constant speed
The body could be stationary or moving at a constant speed
A force of 12 N acts to the left on a body and a force of 16 N acts to the right. What is the size and direction of the resultant force?
4 N to the right
28 N to the left
16 N to the right
A resultant force of 54,000 N acts on a train of mass 18,000 kg. What is the acceleration of the train?
0.3 m/s2
3.0 m/s2
72,000 m/s2
What is a moment?
A measurement of time
The turning effect of a force
A quantity detected by a multimeter
What is the moment of a 6 N force acting 1.5 m from a pivot?
9 N/m
4 Nm
9 Nm
What will be the effect of using a longer lever to apply a force further from the pivot?
The turning effect will increase
There will be no difference in the turning effect
The turning effect will decrease
What is momentum?
The sum of mass and velocity: p = m + v
The product of mass and velocity: p = m × v
The ratio of mass and velocity: p = m ÷ v
What does conservation of momentum mean?
Total momentum before is equal to total momentum after
Total momentum must decrease after a collision
All objects must start with some momentum
Which car safety feature will not reduce the rate of change of momentum?
Roll cage
Airbag
Crumple zone