Numbers
What force is necessary to accelerate a 1,250 kg car at a rate of 40/s/s, using this formula (F=ma)
50000N
If an astronaut throws a ball in space, when will the ball stop?
The ball wont stop until a external force stops it.
What type of activity best displays the use of conservation of momentum?
Newtons Cradle
According to Newtons 2nd law, if there is an increase in force, what will happen to the acceleration of the object? What is the formula
The acceleration of the object increases
F=ma
What does a simple machine do?
changes the magnitude of direction of the force
Given the formula (F=ma), how much force is needed to accelerate a 70bkg rider and her 200kg motor scooter at 4 m/s/s?
1080 N
What happens if the motor of a car at rest exerts more force than the frictional forces holding onto it?
The car moves
When the brakes are suddenly applied to a moving vehicle, what causes a person to continue to move forward in his seat?
Inertia
According to Newtons first law of motion, what will a moving object that is not acted on by an unbalanced do?
Speed
List the 4 types of friction in order of least to greatest strength.
rolling, sliding, fluid, static
A box is pushed with a force of 100 N across the room 5m. How much work is being done?
500 J
If you double the number of wooden blocks being pulled across a surface, what would you expect the force needed to pull them to do?
Double
Why can you run into a person and knock them over if they are standing still?
You transfer momentum to them
Which of Newton's laws explains inertia?
Newtons 1st law
What friction occurs when brakes are applied on a car or bicycle?
Kinetic friction
Which of the following objects have the LEAST inertia: a 5000 kg dump truck of dirt, a 1000 kg car, a 10 kg rock, or a 1 kg cat.
The 1 kg cat
What does a single fixed pulley change on an object?
The direction of the force
The law of conservation of momentum states that when two objects collide, what happens to their combined momentum?
Momentum is conserved
According to Newton's first law of motion, what will a moving object that is not acted on by an unbalanced force do?
It will continue to move at a constant velocity
What friction is acting on an object as it falls through the sky?
Air resistance
In the problem above, the box is pushed in 10 s. What is the power?
50 N
What must happen for work to be done?
A force must be applied over a distance
What is the motion of a catapult?
Projectile motion
What does Newton's 2nd law of motion state about an objects acceleration?
Acceleration is proportional to net force and inversely proportional to mass.
What type of friction causes a sky diver's acceleration to change as he or she falls?
Air resistance