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Questions and Answers
What is the force of gravity at the Earth's surface on a 50 kg girl?
What is the force of gravity at the Earth's surface on a 50 kg girl?
490 N
What is the force of gravity at the Earth's surface on a 100 g bullet?
What is the force of gravity at the Earth's surface on a 100 g bullet?
0.98 N
What is the force of gravity acting on the two objects if they were on the moon (for the girl and bullet)?
What is the force of gravity acting on the two objects if they were on the moon (for the girl and bullet)?
80 N, 0.16 N
What is the object's acceleration if forces of 100 N [N] and 80 N [W] act on an object with a mass of 10 kg?
What is the object's acceleration if forces of 100 N [N] and 80 N [W] act on an object with a mass of 10 kg?
Calculate the net force acting on the object if forces of 2.0 N and 1.0 N act on a mass of 5.0 kg.
Calculate the net force acting on the object if forces of 2.0 N and 1.0 N act on a mass of 5.0 kg.
Calculate the acceleration of the object with a mass of 5.0 kg and net force of 1.7 N.
Calculate the acceleration of the object with a mass of 5.0 kg and net force of 1.7 N.
What is the force exerted by the rope on the flatcar if it is being pulled at an angle of 25° and accelerating at 0.80 m/s²?
What is the force exerted by the rope on the flatcar if it is being pulled at an angle of 25° and accelerating at 0.80 m/s²?
Why does the flatcar have no sideways acceleration if the rope exerts a sideways force?
Why does the flatcar have no sideways acceleration if the rope exerts a sideways force?
What is the acceleration of a block of mass 2.0 kg down a smooth plane inclined at an angle of 15°?
What is the acceleration of a block of mass 2.0 kg down a smooth plane inclined at an angle of 15°?
How far up the plane was the block released if it took 1.5 s to reach the bottom?
How far up the plane was the block released if it took 1.5 s to reach the bottom?
What force must the speedboat be exerting to keep the two skiers moving at a constant speed?
What force must the speedboat be exerting to keep the two skiers moving at a constant speed?
How far will a 3.0 kg toy travel in the first 5.0 s if pulled by a force of 24 N?
How far will a 3.0 kg toy travel in the first 5.0 s if pulled by a force of 24 N?
What is the average net horizontal force acting on a 40 kg sprinter after 2.0 s running at a speed of 8.0 m/s?
What is the average net horizontal force acting on a 40 kg sprinter after 2.0 s running at a speed of 8.0 m/s?
What average force did the wood oppose the motion of the 8.0 g bullet traveling at 400 m/s?
What average force did the wood oppose the motion of the 8.0 g bullet traveling at 400 m/s?
How thick is the block of wood that the bullet passes through?
How thick is the block of wood that the bullet passes through?
What is the average force exerted on a bullet with a mass of 1.8 g and a muzzle velocity of 500 m/s in a rifle barrel 25 cm long?
What is the average force exerted on a bullet with a mass of 1.8 g and a muzzle velocity of 500 m/s in a rifle barrel 25 cm long?
Will a motorist with a reaction time of 0.60 s stop in time when driving at 72 km/h with a child in the road 40 m ahead?
Will a motorist with a reaction time of 0.60 s stop in time when driving at 72 km/h with a child in the road 40 m ahead?
What is the mass of the child if a wagon experiences a frictional force of 73 N and accelerates at 5.0 m/s²?
What is the mass of the child if a wagon experiences a frictional force of 73 N and accelerates at 5.0 m/s²?
What is the sled's original velocity if a force of 36 N increases its velocity to 2vo over a distance of 10 m?
What is the sled's original velocity if a force of 36 N increases its velocity to 2vo over a distance of 10 m?
What is the length of time the force was applied to the sled?
What is the length of time the force was applied to the sled?
What acceleration would the net force of 8.0 N give the two masses if they were fastened together?
What acceleration would the net force of 8.0 N give the two masses if they were fastened together?
What is the instantaneous acceleration of a lawn mower of mass 20 kg being pushed down with a force of 150 N?
What is the instantaneous acceleration of a lawn mower of mass 20 kg being pushed down with a force of 150 N?
What angle does a man pull a package if he drags it with a force of 40 N and the mass is 10 kg resulting in an acceleration of 3.5 m/s²?
What angle does a man pull a package if he drags it with a force of 40 N and the mass is 10 kg resulting in an acceleration of 3.5 m/s²?
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Study Notes
Forces and Motion
- Force of Gravity
- On Earth: g = 9.8 N/kg
- On the Moon: g = 1.6 N/kg
- Net force is the sum of all forces acting on an object
- Newton's Second Law: F = ma (force = mass x acceleration)
- Acceleration is the rate of change of velocity
- Friction opposes motion between surfaces
- Horizontal Force acting on an object can result in horizontal acceleration
- Component of a Force: when a force acts at an angle to the direction of motion, you need to consider the component of the force acting in that direction
- Average Force: the total impulse (force x time) divided by the time interval
- Impulse: change in momentum (mass x velocity)
- Reaction Time: the time it takes to react to a situation
- Work Done: force x distance
- Energy: the ability to do work
- Kinetic Energy: energy of motion
- Potential Energy: stored energy due to position
- Conservation of Energy: Energy can't be created or destroyed, only transferred
- Power: the rate at which work is done
- Efficiency: the ratio of useful energy output to total energy input
Key Concepts
- Direct Proportionality: quantities increase or decrease at the same rate
- Inverse Proportionality: quantities increase or decrease at opposite rates
- Vector Quantities: quantities that have both magnitude and direction
- Scalar Quantities: quantities that have only magnitude
- Displacement: change in position
- Velocity: rate of change of displacement
- Acceleration: rate of change of velocity
- Momentum: mass x velocity
- Impulse: force x time
- Work Done: force x displacement
- Power: work done / time
- Efficiency: useful energy output / total energy input
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