Moments
What is the equation for moments of a force?
M= F x d
What is the formula for Force?
F= m x a
Define a non-contact force.
A force that acts over distance
What is A car went 100 miles in 2 hours. What is the average speed of the car? a) 50 km/hour b) 200 miles/hour c) 50 miles/hour d) 100 km/hour
c) 50 miles/ hour
A ball held at the top of a slide has ________________. a) potential energy b) kinetic energy c) work d) chemical energy
a) potential energy
Balance
What is A ____________ is a push or pull that causes an object to change its motion. a) force b) change c) kinetic d) compound
A) Force
What force is measured as 9.8 m/s and acts on the earth from its center?
Gravity
A boy the weight of 315 N sitting on the left of a seesaw, 1.8m away from the pivot. A girl of weight 210 N is sitting on the right hand side 0.6m away from the pivot. Is the seesaw balanced?
No
When you kick a soccer ball it has __________ energy. a) kinetic b) potential c) mechanical d) chemical
a) kinetic
What is the unit for moments?
Nm (Newton-meters)
State the unit for forces
Newtons or Kgm/s
What type of force has directly acts upon objects?
Contact forces
Calculate the upwards force on the lid if the distance from the pivot to the lid is 0.01 m and the horizontal distance from the pivot to the screwdriver handle is 0.15 m. The person is pushing down with a force of 10 N.
150 N
State the law of conservation of mass.
Energy can neither be created or destroyed.
State two factors that affect moments.
Distance from pivot and size of the force
Who derived the laws of motion?
Isaac Newton
The upward force of an object falling through the air is a) inertia b) air resistance c) momentum d) terminal velocity
b) air resistance
To open a door, a person pushes on the edge of a door with a force of 20 N. The distance between their hand and the hinges is 0.7 metres. What is the moment used to open the door?
M= 14
A place or object used for comparison to determine if an object is in motion is called? a) reference point b) constant speed c) velocity d) distance
a) reference point
What conditions must be met for equilibrium?
The sum of the forces acting in one direction must be equal to the sum of forces acting on the opposite side.
What is _____________ is the tendency of an object to keep moving or stay at rest. a) friction b) force c) inertia d) gravity
c) inertia
What type of force happens when objects rub against each other? a) magnetic force b) contact force c) gravitational force d) frictional force
d) frictional force
A seesaw needs to balance. On one side, 3 m from the pivot, is a box which has a weight of 5 N, and on the other is a box which has a weight of 3 N. Calculate the distance needed between the mass which has a weight of 3 N box and the pivot.
5 meters
State two types of energy
Potential and Kinetic